test(agentic): remove lint integration test

Add a reusable declaration-name eligibility helper that mirrors clangd's
`canHighlightName`, use it to suppress unsupported reference tokens in
the semantic-token collector, and cover the change with focused
semantic-token regression tests plus a constructor/destructor positive
case.

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Bug Fixes**
* Improved semantic token highlighting to suppress ineligible operator
references lacking meaningful source text.
* Ensured constructor and destructor names remain properly highlighted
with correct visual modifiers.

* **Tests**
* Added test coverage for semantic token highlighting behavior across
various declaration types.

<!-- review_stack_entry_start -->

[![Review Change
Stack](https://storage.googleapis.com/coderabbit_public_assets/review-stack-in-coderabbit-ui.svg)](https://app.coderabbit.ai/change-stack/clice-io/clice/pull/434?utm_source=github_walkthrough&utm_medium=github&utm_campaign=change_stack)

<!-- review_stack_entry_end -->
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

.github/actions/setup-pixi/action.yml

@@ -13,7 +13,7 @@ runs:
     - name: Setup Pixi
       uses: prefix-dev/setup-pixi@v0.9.3
       with:
-        pixi-version: v0.62.0
+        pixi-version: v0.67.0
         environments: ${{ inputs.environments }}
         activate-environment: true
         cache: true

.github/workflows/benchmark.yml

@@ -21,7 +21,7 @@ jobs:
 
       - name: Build scan_benchmark
         run: |
-          pixi run cmake-config RelWithDebInfo ON "-DCLICE_ENABLE_BENCHMARK=ON"
+          pixi run cmake-config RelWithDebInfo ON -- -DCLICE_ENABLE_BENCHMARK=ON
           cmake --build build/RelWithDebInfo --target scan_benchmark
 
       - name: Clone LLVM

.github/workflows/build-llvm.yml

@@ -1,6 +1,22 @@
 name: build llvm
 
 on:
+  workflow_dispatch:
+    inputs:
+      llvm_version:
+        description: "LLVM version to build (e.g., 21.1.8)"
+        required: true
+        type: string
+      skip_upload:
+        description: "Skip upload and PR creation (build-only mode)"
+        required: false
+        type: boolean
+        default: false
+      skip_pr:
+        description: "Skip PR creation (upload only, no PR)"
+        required: false
+        type: boolean
+        default: false
   pull_request:
     # if you want to run this workflow, change the branch name to main,
     # if you want to turn off it, change it to non existent branch.
@@ -12,9 +28,7 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - os: windows-2025
-            llvm_mode: Debug
-            lto: OFF
+          # Native builds
           - os: windows-2025
             llvm_mode: RelWithDebInfo
             lto: OFF
@@ -39,6 +53,42 @@ jobs:
           - os: macos-15
             llvm_mode: RelWithDebInfo
             lto: ON
+
+          # Cross-compilation builds
+          # macOS x64 (from arm64 macos-15)
+          - os: macos-15
+            llvm_mode: RelWithDebInfo
+            lto: OFF
+            target_triple: x86_64-apple-darwin
+          - os: macos-15
+            llvm_mode: RelWithDebInfo
+            lto: ON
+            target_triple: x86_64-apple-darwin
+
+          # Linux aarch64 (from x64 ubuntu-24.04)
+          - os: ubuntu-24.04
+            llvm_mode: RelWithDebInfo
+            lto: OFF
+            target_triple: aarch64-linux-gnu
+            pixi_env: cross-linux-aarch64
+          - os: ubuntu-24.04
+            llvm_mode: RelWithDebInfo
+            lto: ON
+            target_triple: aarch64-linux-gnu
+            pixi_env: cross-linux-aarch64
+
+          # Windows arm64 (from x64 windows-2025)
+          - os: windows-2025
+            llvm_mode: RelWithDebInfo
+            lto: OFF
+            target_triple: aarch64-pc-windows-msvc
+            pixi_env: cross-windows-arm64
+          - os: windows-2025
+            llvm_mode: RelWithDebInfo
+            lto: ON
+            target_triple: aarch64-pc-windows-msvc
+            pixi_env: cross-windows-arm64
+
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout repository
@@ -67,49 +117,91 @@ jobs:
           free -h
           df -h
 
-      - name: Setup Pixi
-        uses: prefix-dev/setup-pixi@v0.9.3
+      - uses: ./.github/actions/setup-pixi
         with:
-          pixi-version: v0.59.0
-          environments: package
-          activate-environment: true
-          cache: true
-          locked: true
+          environments: ${{ matrix.pixi_env || 'package' }}
 
-      - name: Clone llvm-project (21.1.4)
+      - name: Clone llvm-project
         shell: bash
         run: |
-          git clone --branch llvmorg-21.1.4 --depth 1 https://github.com/llvm/llvm-project.git .llvm
+          VERSION="${{ inputs.llvm_version || '21.1.8' }}"
+          echo "Cloning LLVM ${VERSION}..."
+          git clone --branch "llvmorg-${VERSION}" --depth 1 https://github.com/llvm/llvm-project.git .llvm
+
+      - name: Validate distribution components
+        shell: bash
+        run: |
+          python3 scripts/validate-llvm-components.py \
+            --llvm-src=.llvm \
+            --components-file=scripts/llvm-components.json
 
       - name: Build LLVM (install-distribution)
         shell: bash
         run: |
-          pixi run build-llvm --llvm-src=.llvm --mode="${{ matrix.llvm_mode }}" --lto="${{ matrix.lto }}" --build-dir=build
+          ENV="${{ matrix.pixi_env || 'package' }}"
+          EXTRA_ARGS=""
+          if [[ -n "${{ matrix.target_triple }}" ]]; then
+            EXTRA_ARGS="--target-triple=${{ matrix.target_triple }}"
+          fi
+          pixi run -e "$ENV" build-llvm \
+            --llvm-src=.llvm \
+            --mode="${{ matrix.llvm_mode }}" \
+            --lto="${{ matrix.lto }}" \
+            --build-dir=build \
+            ${EXTRA_ARGS}
 
       - name: Build clice using installed LLVM
+        if: ${{ !matrix.target_triple }}
         shell: bash
         run: |
-          cmake -B build -G Ninja \
-            -DCMAKE_BUILD_TYPE=${{ matrix.llvm_mode }} \
-            -DCMAKE_TOOLCHAIN_FILE=cmake/toolchain.cmake \
-            -DCLICE_ENABLE_TEST=ON \
-            -DCLICE_CI_ENVIRONMENT=ON \
-            -DCLICE_ENABLE_LTO=${{ matrix.lto }} \
-            -DLLVM_INSTALL_PATH=".llvm/build-install"
-          cmake --build build
+          pixi run cmake-config ${{ matrix.llvm_mode }} ON -- \
+            "-DCLICE_ENABLE_LTO=${{ matrix.lto }}" \
+            "-DLLVM_INSTALL_PATH=.llvm/build-install"
+          pixi run cmake-build ${{ matrix.llvm_mode }}
+
+      - name: Build clice using installed LLVM (cross-compile)
+        if: ${{ matrix.target_triple }}
+        shell: bash
+        run: |
+          ENV="${{ matrix.pixi_env || 'package' }}"
+          pixi run -e "$ENV" cmake-config ${{ matrix.llvm_mode }} ON -- \
+            "-DCLICE_ENABLE_LTO=${{ matrix.lto }}" \
+            "-DCLICE_TARGET_TRIPLE=${{ matrix.target_triple }}" \
+            "-DLLVM_INSTALL_PATH=.llvm/build-install"
+          pixi run -e "$ENV" cmake-build ${{ matrix.llvm_mode }}
+
+      - name: Verify cross-compiled binary architecture
+        if: ${{ matrix.target_triple && runner.os != 'Windows' }}
+        shell: bash
+        run: |
+          BINARY="build/${{ matrix.llvm_mode }}/bin/clice"
+          echo "Binary info:"
+          file "$BINARY"
+          case "${{ matrix.target_triple }}" in
+            aarch64-linux-gnu)   file "$BINARY" | grep -q "aarch64" ;;
+            x86_64-apple-darwin) file "$BINARY" | grep -q "x86_64" ;;
+          esac
+
+      - name: Upload cross-compiled clice for functional test
+        if: ${{ matrix.target_triple && matrix.lto == 'OFF' }}
+        uses: actions/upload-artifact@v4
+        with:
+          name: cross-clice-${{ matrix.target_triple }}-${{ matrix.llvm_mode }}
+          path: |
+            build/${{ matrix.llvm_mode }}/bin/
+            build/${{ matrix.llvm_mode }}/lib/
+          if-no-files-found: error
+          retention-days: 1
 
       - name: Run tests
+        if: ${{ !matrix.target_triple }}
         shell: bash
-        run: |
-          EXE_EXT=""
-          if [[ "${{ runner.os }}" == "Windows" ]]; then
-            EXE_EXT=".exe"
-          fi
-          ./build/bin/unit_tests${EXE_EXT} --test-dir="./tests/data"
-          uv run --project tests pytest -s --log-cli-level=INFO tests/integration --executable=./build/bin/clice${EXE_EXT}
+        run: pixi run test ${{ matrix.llvm_mode }}
 
+      # Prune is only supported for native builds (requires linking clice to test).
+      # Cross-compiled targets reuse the native prune manifest of the same OS.
       - name: Prune LLVM static libraries (Debug/RelWithDebInfo no LTO)
-        if: matrix.llvm_mode == 'Debug' || (matrix.llvm_mode == 'RelWithDebInfo' && matrix.lto == 'OFF')
+        if: (!matrix.target_triple) && (matrix.llvm_mode == 'Debug' || (matrix.llvm_mode == 'RelWithDebInfo' && matrix.lto == 'OFF'))
         shell: bash
         run: |
           MANIFEST="pruned-libs-${{ matrix.os }}.json"
@@ -117,13 +209,13 @@ jobs:
           python3 scripts/prune-llvm-bin.py \
             --action discover \
             --install-dir ".llvm/build-install/lib" \
-            --build-dir "build" \
+            --build-dir "build/${{ matrix.llvm_mode }}" \
             --max-attempts 60 \
             --sleep-seconds 60 \
             --manifest "${MANIFEST}"
 
       - name: Upload pruned-libs manifest
-        if: matrix.llvm_mode == 'RelWithDebInfo' && matrix.lto == 'OFF'
+        if: (!matrix.target_triple) && matrix.llvm_mode == 'RelWithDebInfo' && matrix.lto == 'OFF'
         uses: actions/upload-artifact@v4
         with:
           name: llvm-pruned-libs-${{ matrix.os }}
@@ -131,8 +223,8 @@ jobs:
           if-no-files-found: error
           compression-level: 0
 
-      - name: Apply pruned-libs manifest (RelWithDebInfo + LTO)
-        if: matrix.llvm_mode == 'RelWithDebInfo' && matrix.lto == 'ON'
+      - name: Apply pruned-libs manifest (RelWithDebInfo + LTO, native only)
+        if: (!matrix.target_triple) && matrix.llvm_mode == 'RelWithDebInfo' && matrix.lto == 'ON'
         shell: bash
         env:
           GH_TOKEN: ${{ github.token }}
@@ -142,7 +234,27 @@ jobs:
             --action apply \
             --manifest "${MANIFEST}" \
             --install-dir ".llvm/build-install/lib" \
-            --build-dir "build" \
+            --build-dir "build/${{ matrix.llvm_mode }}" \
+            --gh-run-id "${{ github.run_id }}" \
+            --gh-artifact "llvm-pruned-libs-${{ matrix.os }}" \
+            --gh-download-dir "artifacts" \
+            --max-attempts 60 \
+            --sleep-seconds 60
+
+      # For cross-compiled LTO builds, apply the native prune manifest.
+      # The unused library set is arch-independent (same API surface).
+      - name: Apply pruned-libs manifest (cross-compile + LTO)
+        if: matrix.target_triple && matrix.lto == 'ON'
+        shell: bash
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: |
+          MANIFEST="pruned-libs-${{ matrix.os }}.json"
+          python3 scripts/prune-llvm-bin.py \
+            --action apply \
+            --manifest "${MANIFEST}" \
+            --install-dir ".llvm/build-install/lib" \
+            --build-dir "build/${{ matrix.llvm_mode }}" \
             --gh-run-id "${{ github.run_id }}" \
             --gh-artifact "llvm-pruned-libs-${{ matrix.os }}" \
             --gh-download-dir "artifacts" \
@@ -157,23 +269,35 @@ jobs:
             MODE_TAG="debug"
           fi
 
-          ARCH="x64"
-          PLATFORM="linux"
-          TOOLCHAIN="gnu"
-          if [[ "${{ matrix.os }}" == windows-* ]]; then
-            PLATFORM="windows"
-            TOOLCHAIN="msvc"
-          elif [[ "${{ matrix.os }}" == macos-* ]]; then
-            ARCH="arm64"
-            PLATFORM="macos"
-            TOOLCHAIN="clang"
+          # Determine arch/platform/toolchain from target triple or runner OS
+          if [[ -n "${{ matrix.target_triple }}" ]]; then
+            case "${{ matrix.target_triple }}" in
+              x86_64-apple-darwin)
+                ARCH="x64"; PLATFORM="macos"; TOOLCHAIN="clang" ;;
+              aarch64-linux-gnu)
+                ARCH="aarch64"; PLATFORM="linux"; TOOLCHAIN="gnu" ;;
+              aarch64-pc-windows-msvc)
+                ARCH="aarch64"; PLATFORM="windows"; TOOLCHAIN="msvc" ;;
+            esac
+          else
+            ARCH="x64"
+            PLATFORM="linux"
+            TOOLCHAIN="gnu"
+            if [[ "${{ matrix.os }}" == windows-* ]]; then
+              PLATFORM="windows"
+              TOOLCHAIN="msvc"
+            elif [[ "${{ matrix.os }}" == macos-* ]]; then
+              ARCH="arm64"
+              PLATFORM="macos"
+              TOOLCHAIN="clang"
+            fi
           fi
 
           SUFFIX=""
           if [[ "${{ matrix.lto }}" == "ON" ]]; then
             SUFFIX="-lto"
           fi
-          if [[ "${{ matrix.llvm_mode }}" == "Debug" ]]; then
+          if [[ "${{ matrix.llvm_mode }}" == "Debug" && "${{ matrix.os }}" != windows-* ]]; then
             SUFFIX="${SUFFIX}-asan"
           fi
 
@@ -189,3 +313,134 @@ jobs:
           name: ${{ env.LLVM_INSTALL_ARCHIVE }}
           path: ${{ env.LLVM_INSTALL_ARCHIVE }}
           if-no-files-found: error
+
+  test-cross:
+    needs: build
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - os: macos-15-intel
+            llvm_mode: RelWithDebInfo
+            target_triple: x86_64-apple-darwin
+          - os: ubuntu-24.04-arm
+            llvm_mode: RelWithDebInfo
+            target_triple: aarch64-linux-gnu
+          - os: windows-11-arm
+            llvm_mode: RelWithDebInfo
+            target_triple: aarch64-pc-windows-msvc
+    runs-on: ${{ matrix.os }}
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - uses: ./.github/actions/setup-pixi
+        with:
+          environments: test-run
+
+      - name: Download cross-compiled clice
+        uses: actions/download-artifact@v4
+        with:
+          name: cross-clice-${{ matrix.target_triple }}-${{ matrix.llvm_mode }}
+          path: build/${{ matrix.llvm_mode }}/
+
+      - name: Make binaries executable
+        if: runner.os != 'Windows'
+        run: chmod +x build/${{ matrix.llvm_mode }}/bin/*
+
+      - name: Run tests
+        run: pixi run -e test-run test ${{ matrix.llvm_mode }}
+
+  upload:
+    needs: build
+    if: ${{ !cancelled() && inputs.llvm_version && !inputs.skip_upload }}
+    runs-on: ubuntu-24.04
+    permissions:
+      contents: read
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Download all build artifacts
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: scripts/download-llvm.sh "${{ github.run_id }}"
+
+      - name: Upload to clice-llvm
+        env:
+          GH_TOKEN: ${{ secrets.UPLOAD_LLVM }}
+          TARGET_REPO: clice-io/clice-llvm
+        run: python3 scripts/upload-llvm.py "${{ inputs.llvm_version }}" "${TARGET_REPO}" "${{ github.run_id }}"
+
+      - name: Save manifest for update-clice job
+        uses: actions/upload-artifact@v4
+        with:
+          name: llvm-manifest-final
+          path: artifacts/llvm-manifest.json
+          if-no-files-found: error
+          compression-level: 0
+
+  update-clice:
+    needs: upload
+    if: ${{ !inputs.skip_pr }}
+    runs-on: ubuntu-24.04
+    permissions:
+      contents: write
+      pull-requests: write
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Download manifest
+        uses: actions/download-artifact@v4
+        with:
+          name: llvm-manifest-final
+          path: .
+
+      - name: Update manifest and version
+        run: |
+          python3 scripts/update-llvm-version.py \
+            --version "${{ inputs.llvm_version }}" \
+            --manifest-src llvm-manifest.json \
+            --manifest-dest config/llvm-manifest.json \
+            --package-cmake cmake/package.cmake
+
+      - name: Create or update PR
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: |
+          VERSION="${{ inputs.llvm_version }}"
+          BRANCH="chore/update-llvm-${VERSION}"
+          RUN_URL="https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}"
+          RELEASE_URL="https://github.com/clice-io/clice-llvm/releases/tag/${VERSION}"
+
+          git config user.name "github-actions[bot]"
+          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
+          git checkout -b "${BRANCH}"
+          git add config/llvm-manifest.json cmake/package.cmake
+          git commit -m "chore: update LLVM to ${VERSION}"
+          git push --force-with-lease origin "${BRANCH}"
+
+          # Check if PR already exists for this branch
+          EXISTING_PR=$(gh pr list --head "${BRANCH}" --json number --jq '.[0].number // empty')
+
+          BODY="$(cat <<EOF
+          ## Summary
+          - Update LLVM prebuilt binaries to version ${VERSION}
+          - Updated \`config/llvm-manifest.json\` with new SHA256 hashes
+          - Updated \`cmake/package.cmake\` version string
+
+          **Artifacts:** [clice-llvm release](${RELEASE_URL})
+          **Build:** [workflow run](${RUN_URL})
+
+          > Auto-generated by build-llvm workflow
+          EOF
+          )"
+
+          if [[ -n "${EXISTING_PR}" ]]; then
+            echo "Updating existing PR #${EXISTING_PR}"
+            gh pr edit "${EXISTING_PR}" --body "${BODY}"
+          else
+            gh pr create \
+              --title "chore: update LLVM to ${VERSION}" \
+              --body "${BODY}" \
+              --base main
+          fi

.github/workflows/check-format.yml

@@ -14,6 +14,12 @@ jobs:
         with:
           environments: format
 
+      - name: Validate update-llvm-version.py can still patch package.cmake
+        run: |
+          python3 scripts/update-llvm-version.py --check \
+            --manifest-dest config/llvm-manifest.json \
+            --package-cmake cmake/package.cmake
+
       - name: Run formatter
         run: pixi run format
         continue-on-error: true

.github/workflows/main.yml

@@ -7,6 +7,10 @@ on:
   pull_request:
     branches: [main]
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: ${{ github.ref != 'refs/heads/main' }}
+
 jobs:
   changes:
     if: ${{ !startsWith(github.ref, 'refs/tags/') }}

.github/workflows/publish-clice.yml

@@ -9,6 +9,7 @@ jobs:
       fail-fast: false
       matrix:
         include:
+          # Native builds
           - os: windows-2025
             artifact_name: clice.zip
             asset_name: clice-x64-windows-msvc.zip
@@ -27,6 +28,31 @@ jobs:
             symbol_artifact_name: clice-symbol.tar.gz
             symbol_asset_name: clice-arm64-macos-darwin-symbol.tar.gz
 
+          # Cross-compilation builds
+          - os: macos-15
+            target_triple: x86_64-apple-darwin
+            pixi_env: cross-macos-x64
+            artifact_name: clice.tar.gz
+            asset_name: clice-x86_64-macos-darwin.tar.gz
+            symbol_artifact_name: clice-symbol.tar.gz
+            symbol_asset_name: clice-x86_64-macos-darwin-symbol.tar.gz
+
+          - os: ubuntu-24.04
+            target_triple: aarch64-linux-gnu
+            pixi_env: cross-linux-aarch64
+            artifact_name: clice.tar.gz
+            asset_name: clice-aarch64-linux-gnu.tar.gz
+            symbol_artifact_name: clice-symbol.tar.gz
+            symbol_asset_name: clice-aarch64-linux-gnu-symbol.tar.gz
+
+          - os: windows-2025
+            target_triple: aarch64-pc-windows-msvc
+            pixi_env: cross-windows-arm64
+            artifact_name: clice.zip
+            asset_name: clice-aarch64-windows-msvc.zip
+            symbol_artifact_name: clice-symbol.zip
+            symbol_asset_name: clice-aarch64-windows-msvc-symbol.zip
+
     runs-on: ${{ matrix.os }}
 
     defaults:
@@ -39,11 +65,20 @@ jobs:
 
       - uses: ./.github/actions/setup-pixi
         with:
-          environments: package
+          environments: ${{ matrix.pixi_env || 'package' }}
 
-      - name: Package
+      - name: Package (native)
+        if: ${{ !matrix.target_triple }}
         run: pixi run package
 
+      - name: Package (cross-compile)
+        if: ${{ matrix.target_triple }}
+        run: |
+          ENV="${{ matrix.pixi_env }}"
+          pixi run -e "$ENV" package-config -- \
+            "-DCLICE_TARGET_TRIPLE=${{ matrix.target_triple }}"
+          pixi run -e "$ENV" cmake-build
+
       - name: Upload Main Package to Release
         if: startsWith(github.ref, 'refs/tags/v')
         uses: svenstaro/upload-release-action@v2

.github/workflows/test-cmake.yml

@@ -17,53 +17,154 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [windows-2025, ubuntu-24.04, macos-15]
-        build_type: [Debug, RelWithDebInfo]
+        include:
+          # Native builds
+          - os: windows-2025
+            build_type: RelWithDebInfo
+          - os: ubuntu-24.04
+            build_type: Debug
+          - os: ubuntu-24.04
+            build_type: RelWithDebInfo
+          - os: macos-15
+            build_type: Debug
+          - os: macos-15
+            build_type: RelWithDebInfo
+          # Cross-compile (build only; tests run on native runners)
+          - os: macos-15
+            build_type: RelWithDebInfo
+            target_triple: x86_64-apple-darwin
+            build_only: true
+          - os: ubuntu-24.04
+            build_type: RelWithDebInfo
+            target_triple: aarch64-linux-gnu
+            build_only: true
+            pixi_env: cross-linux-aarch64
+          - os: windows-2025
+            build_type: RelWithDebInfo
+            target_triple: aarch64-pc-windows-msvc
+            build_only: true
+            pixi_env: cross-windows-arm64
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
 
       - uses: ./.github/actions/setup-pixi
+        with:
+          environments: ${{ matrix.pixi_env || 'default' }}
 
       - name: Restore compiler cache
         uses: actions/cache@v4
         with:
           path: ${{ runner.os == 'Windows' && '.cache/sccache' || '.cache/ccache' }}
-          key: ${{ runner.os }}-${{ matrix.build_type }}-ccache-${{ github.sha }}
+          key: ${{ runner.os }}-${{ matrix.build_type }}-${{ matrix.target_triple || 'native' }}-ccache-${{ github.sha }}
           restore-keys: |
-            ${{ runner.os }}-${{ matrix.build_type }}-ccache-
+            ${{ runner.os }}-${{ matrix.build_type }}-${{ matrix.target_triple || 'native' }}-ccache-
 
       - name: Zero cache stats
         run: |
+          ENV="${{ matrix.pixi_env || 'default' }}"
           if [ "$RUNNER_OS" = "Windows" ]; then
-            pixi run -- sccache --stop-server || true
-            pixi run -- sccache --zero-stats || true
+            pixi run -e "$ENV" -- sccache --stop-server || true
+            pixi run -e "$ENV" -- sccache --zero-stats || true
           else
-            pixi run -- ccache --zero-stats || true
+            pixi run -e "$ENV" -- ccache --zero-stats || true
           fi
         shell: bash
 
-      - name: Build
+      - name: Build (native)
+        if: ${{ !matrix.target_triple }}
         run: pixi run build ${{ matrix.build_type }} ON
 
-      - name: Unit Test
+      - name: Build (cross-compile)
+        if: ${{ matrix.target_triple }}
+        shell: bash
+        run: |
+          ENV="${{ matrix.pixi_env || 'default' }}"
+          pixi run -e "$ENV" cmake-config ${{ matrix.build_type }} OFF -- \
+            "-DCLICE_TARGET_TRIPLE=${{ matrix.target_triple }}"
+          pixi run -e "$ENV" cmake-build ${{ matrix.build_type }}
+
+      - name: Upload cross-compiled binaries
+        if: ${{ matrix.build_only }}
+        uses: actions/upload-artifact@v4
+        with:
+          name: cross-build-${{ matrix.target_triple }}
+          path: |
+            build/${{ matrix.build_type }}/bin/
+            build/${{ matrix.build_type }}/lib/
+          if-no-files-found: error
+          retention-days: 1
+
+      - name: Unit tests
+        if: ${{ !matrix.build_only }}
+        timeout-minutes: 5
         run: pixi run unit-test ${{ matrix.build_type }}
 
-      - name: Integration Test
+      - name: Integration tests
+        if: ${{ !matrix.build_only }}
+        timeout-minutes: 20
         run: pixi run integration-test ${{ matrix.build_type }}
 
-      - name: Smoke Test
-        if: success() || failure()
+      - name: Smoke tests
+        if: ${{ !matrix.build_only }}
+        timeout-minutes: 15
         run: pixi run smoke-test ${{ matrix.build_type }}
 
       - name: Print cache stats and stop server
         if: always()
         run: |
+          ENV="${{ matrix.pixi_env || 'default' }}"
           if [ "$RUNNER_OS" = "Windows" ]; then
-            pixi run -- sccache --show-stats
-            pixi run -- sccache --stop-server || true
+            pixi run -e "$ENV" -- sccache --show-stats
+            pixi run -e "$ENV" -- sccache --stop-server || true
           else
-            pixi run -- ccache --show-stats
+            pixi run -e "$ENV" -- ccache --show-stats
           fi
         shell: bash
+
+  test-cross:
+    needs: build
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - os: macos-15-intel
+            build_type: RelWithDebInfo
+            target_triple: x86_64-apple-darwin
+          - os: ubuntu-24.04-arm
+            build_type: RelWithDebInfo
+            target_triple: aarch64-linux-gnu
+          - os: windows-11-arm
+            build_type: RelWithDebInfo
+            target_triple: aarch64-pc-windows-msvc
+    runs-on: ${{ matrix.os }}
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - uses: ./.github/actions/setup-pixi
+        with:
+          environments: test-run
+
+      - name: Download cross-compiled binaries
+        uses: actions/download-artifact@v4
+        with:
+          name: cross-build-${{ matrix.target_triple }}
+          path: build/${{ matrix.build_type }}/
+
+      - name: Make binaries executable
+        if: runner.os != 'Windows'
+        run: chmod +x build/${{ matrix.build_type }}/bin/*
+
+      - name: Unit tests
+        timeout-minutes: 5
+        run: pixi run -e test-run unit-test ${{ matrix.build_type }}
+
+      - name: Integration tests
+        timeout-minutes: 20
+        run: pixi run -e test-run integration-test ${{ matrix.build_type }}
+
+      - name: Smoke tests
+        timeout-minutes: 10
+        run: pixi run -e test-run smoke-test ${{ matrix.build_type }}

.gitignore

@@ -68,8 +68,7 @@ tests/unit/Local/
 .pixi/*
 !.pixi/config.toml
 
-.codex/
+.codex
 .claude/*
 !.claude/CLAUDE.md
 !.claude/commands/
-openspec/

CMakeLists.txt

@@ -124,22 +124,63 @@ if(CLICE_CI_ENVIRONMENT)
     target_compile_definitions(clice_options INTERFACE CLICE_CI_ENVIRONMENT=1)
 endif()
 
+set(CLICE_CLANG_TIDY_MODULE_LIBRARIES)
+set(CLICE_MISSING_CLANG_TIDY_MODULES)
+foreach(module IN LISTS CLICE_CLANG_TIDY_MODULE_COMPONENTS)
+    find_library(CLICE_${module}_LIBRARY
+        NAMES "${module}"
+        PATHS "${LLVM_INSTALL_PATH}/lib"
+        NO_DEFAULT_PATH
+    )
+    if(CLICE_${module}_LIBRARY)
+        list(APPEND CLICE_CLANG_TIDY_MODULE_LIBRARIES "${CLICE_${module}_LIBRARY}")
+    else()
+        list(APPEND CLICE_MISSING_CLANG_TIDY_MODULES "${module}")
+    endif()
+endforeach()
+
+if(CLICE_MISSING_CLANG_TIDY_MODULES)
+    message(STATUS "Clang-tidy module libraries not available: ${CLICE_MISSING_CLANG_TIDY_MODULES}")
+else()
+    target_compile_definitions(clice_options INTERFACE CLICE_HAS_CLANG_TIDY_MODULES=1)
+endif()
+
 set(FBS_SCHEMA_FILE "${PROJECT_SOURCE_DIR}/src/index/schema.fbs")
 set(GENERATED_HEADER "${PROJECT_BINARY_DIR}/generated/schema_generated.h")
+set(CLANG_TIDY_CONFIG_SOURCE_FILE "${PROJECT_SOURCE_DIR}/config/clang-tidy-config.h")
+set(CLANG_TIDY_CONFIG_GENERATED_FILE "${PROJECT_BINARY_DIR}/generated/clang-tidy-config.h")
+
+if(CMAKE_CROSSCOMPILING)
+    find_program(FLATC_EXECUTABLE flatc REQUIRED)
+    set(FLATC_CMD "${FLATC_EXECUTABLE}")
+else()
+    set(FLATC_CMD "$<TARGET_FILE:flatc>")
+endif()
 
 add_custom_command(
     OUTPUT "${GENERATED_HEADER}"
-    COMMAND $<TARGET_FILE:flatc> --cpp -o "${PROJECT_BINARY_DIR}/generated" "${FBS_SCHEMA_FILE}"
+    COMMAND ${FLATC_CMD} --cpp -o "${PROJECT_BINARY_DIR}/generated" "${FBS_SCHEMA_FILE}"
     DEPENDS "${FBS_SCHEMA_FILE}"
     COMMENT "Generating C++ header from ${FBS_SCHEMA_FILE}"
 )
 
 add_custom_target(generate_flatbuffers_schema DEPENDS "${GENERATED_HEADER}")
 
+add_custom_command(
+    OUTPUT "${CLANG_TIDY_CONFIG_GENERATED_FILE}"
+    COMMAND ${CMAKE_COMMAND} -E copy_if_different
+        "${CLANG_TIDY_CONFIG_SOURCE_FILE}"
+        "${CLANG_TIDY_CONFIG_GENERATED_FILE}"
+    DEPENDS "${CLANG_TIDY_CONFIG_SOURCE_FILE}"
+    COMMENT "Generating C++ header from ${CLANG_TIDY_CONFIG_SOURCE_FILE}"
+)
+
+add_custom_target(generate_clang_tidy_config DEPENDS "${CLANG_TIDY_CONFIG_GENERATED_FILE}")
+
 file(GLOB_RECURSE CLICE_CORE_SOURCES CONFIGURE_DEPENDS "${PROJECT_SOURCE_DIR}/src/*.cpp")
 add_library(clice-core STATIC ${CLICE_CORE_SOURCES})
 add_library(clice::core ALIAS clice-core)
-add_dependencies(clice-core generate_flatbuffers_schema)
+add_dependencies(clice-core generate_flatbuffers_schema generate_clang_tidy_config)
 
 target_include_directories(clice-core PUBLIC
     "${PROJECT_SOURCE_DIR}/src"
@@ -155,6 +196,9 @@ target_link_libraries(clice-core PUBLIC
     kota::codec::toml
     simdjson::simdjson
 )
+if(CLICE_CLANG_TIDY_MODULE_LIBRARIES)
+    target_link_libraries(clice-core PUBLIC ${CLICE_CLANG_TIDY_MODULE_LIBRARIES})
+endif()
 
 add_executable(clice "${PROJECT_SOURCE_DIR}/src/clice.cc")
 target_link_libraries(clice PRIVATE clice::core kota::deco)

benchmarks/scan_benchmark.cpp

@@ -26,7 +26,7 @@
 #include "support/path_pool.h"
 #include "syntax/dependency_graph.h"
 
-#include "kota/codec/json/serializer.h"
+#include "kota/codec/json/json.h"
 #include "kota/deco/deco.h"
 #include "llvm/Support/FileSystem.h"
 

cmake/llvm.cmake

@@ -1,5 +1,34 @@
 include_guard()
 
+set(CLICE_CLANG_TIDY_MODULE_COMPONENTS
+    # Keep this in sync with scripts/llvm-components.json and the old
+    # ALL_CLANG_TIDY_CHECKS list. MPIModule is intentionally excluded because
+    # clice disables static analyzer checks in ClangTidyForceLinker.h.
+    clangTidyAndroidModule
+    clangTidyAbseilModule
+    clangTidyAlteraModule
+    clangTidyBoostModule
+    clangTidyBugproneModule
+    clangTidyCERTModule
+    clangTidyConcurrencyModule
+    clangTidyCppCoreGuidelinesModule
+    clangTidyDarwinModule
+    clangTidyFuchsiaModule
+    clangTidyGoogleModule
+    clangTidyHICPPModule
+    clangTidyLinuxKernelModule
+    clangTidyLLVMModule
+    clangTidyLLVMLibcModule
+    clangTidyMiscModule
+    clangTidyModernizeModule
+    clangTidyObjCModule
+    clangTidyOpenMPModule
+    clangTidyPerformanceModule
+    clangTidyPortabilityModule
+    clangTidyReadabilityModule
+    clangTidyZirconModule
+)
+
 function(setup_llvm LLVM_VERSION)
     find_package(Python3 COMPONENTS Interpreter REQUIRED)
 
@@ -25,6 +54,22 @@ function(setup_llvm LLVM_VERSION)
         list(APPEND LLVM_SETUP_ARGS "--offline")
     endif()
 
+    if(DEFINED CLICE_TARGET_TRIPLE)
+        if(CLICE_TARGET_TRIPLE MATCHES "linux")
+            list(APPEND LLVM_SETUP_ARGS "--target-platform" "Linux")
+        elseif(CLICE_TARGET_TRIPLE MATCHES "darwin")
+            list(APPEND LLVM_SETUP_ARGS "--target-platform" "macosx")
+        elseif(CLICE_TARGET_TRIPLE MATCHES "windows")
+            list(APPEND LLVM_SETUP_ARGS "--target-platform" "Windows")
+        endif()
+
+        if(CLICE_TARGET_TRIPLE MATCHES "^aarch64")
+            list(APPEND LLVM_SETUP_ARGS "--target-arch" "arm64")
+        elseif(CLICE_TARGET_TRIPLE MATCHES "^x86_64")
+            list(APPEND LLVM_SETUP_ARGS "--target-arch" "x64")
+        endif()
+    endif()
+
     execute_process(
         COMMAND "${Python3_EXECUTABLE}" "${LLVM_SETUP_SCRIPT}" ${LLVM_SETUP_ARGS}
         RESULT_VARIABLE LLVM_SETUP_RESULT
@@ -71,29 +116,6 @@ function(setup_llvm LLVM_VERSION)
             clangSerialization
             clangTidy
             clangTidyUtils
-            clangTidyAndroidModule
-            clangTidyAbseilModule
-            clangTidyAlteraModule
-            clangTidyBoostModule
-            clangTidyBugproneModule
-            clangTidyCERTModule
-            clangTidyConcurrencyModule
-            clangTidyCppCoreGuidelinesModule
-            clangTidyDarwinModule
-            clangTidyFuchsiaModule
-            clangTidyGoogleModule
-            clangTidyHICPPModule
-            clangTidyLinuxKernelModule
-            clangTidyLLVMModule
-            clangTidyLLVMLibcModule
-            clangTidyMiscModule
-            clangTidyModernizeModule
-            clangTidyObjCModule
-            clangTidyOpenMPModule
-            clangTidyPerformanceModule
-            clangTidyPortabilityModule
-            clangTidyReadabilityModule
-            clangTidyZirconModule
             clangTooling
             clangToolingCore
             clangToolingInclusions

cmake/package.cmake

@@ -1,7 +1,7 @@
 include_guard()
 
 include(${CMAKE_CURRENT_LIST_DIR}/llvm.cmake)
-setup_llvm("21.1.4+r1")
+setup_llvm("21.1.8")
 
 # install dependencies
 include(FetchContent)
@@ -41,8 +41,7 @@ set(FLATBUFFERS_BUILD_FLATHASH OFF CACHE BOOL "" FORCE)
 FetchContent_Declare(
     kotatsu
     GIT_REPOSITORY https://github.com/clice-io/kotatsu
-    GIT_TAG main
-    GIT_SHALLOW TRUE
+    GIT_TAG 73814044ce8142f4438a3028f44668675fc09fff
 )
 
 set(KOTA_ENABLE_ZEST ON)

cmake/toolchain.cmake

@@ -1,5 +1,29 @@
 cmake_minimum_required(VERSION 3.30)
 
+# Cross-compilation support via CLICE_TARGET_TRIPLE.
+# Examples:
+#   -DCLICE_TARGET_TRIPLE=x86_64-apple-darwin      (macOS x64 from arm64)
+#   -DCLICE_TARGET_TRIPLE=aarch64-linux-gnu         (Linux arm64 from x64)
+#   -DCLICE_TARGET_TRIPLE=aarch64-pc-windows-msvc   (Windows arm64 from x64)
+if(DEFINED CLICE_TARGET_TRIPLE)
+    if(CLICE_TARGET_TRIPLE MATCHES "^x86_64-apple-darwin")
+        set(CMAKE_OSX_ARCHITECTURES "x86_64" CACHE STRING "")
+    elseif(CLICE_TARGET_TRIPLE MATCHES "^aarch64-.*linux")
+        set(CMAKE_SYSTEM_NAME Linux)
+        set(CMAKE_SYSTEM_PROCESSOR aarch64)
+        set(CMAKE_C_COMPILER_TARGET "aarch64-linux-gnu" CACHE STRING "")
+        set(CMAKE_CXX_COMPILER_TARGET "aarch64-linux-gnu" CACHE STRING "")
+        if(DEFINED ENV{CONDA_PREFIX} AND NOT DEFINED CMAKE_SYSROOT)
+            set(CMAKE_SYSROOT "$ENV{CONDA_PREFIX}/aarch64-conda-linux-gnu/sysroot" CACHE PATH "")
+        endif()
+    elseif(CLICE_TARGET_TRIPLE MATCHES "^aarch64-.*-windows")
+        set(CMAKE_SYSTEM_NAME Windows)
+        set(CMAKE_SYSTEM_PROCESSOR ARM64)
+        set(CMAKE_C_COMPILER_TARGET "aarch64-pc-windows-msvc" CACHE STRING "")
+        set(CMAKE_CXX_COMPILER_TARGET "aarch64-pc-windows-msvc" CACHE STRING "")
+    endif()
+endif()
+
 set(CMAKE_C_COMPILER clang CACHE STRING "")
 set(CMAKE_CXX_COMPILER clang++ CACHE STRING "")
 

config/llvm-manifest.json

@@ -1,83 +1,142 @@
 [
   {
-    "version": "21.1.4+r1",
+    "version": "21.1.8",
+    "filename": "aarch64-linux-gnu-releasedbg-lto.tar.xz",
+    "sha256": "f3444ee840b50933c23656cbee7c4d010e752ac55ca66095b97f7c0e997b13b5",
+    "lto": true,
+    "asan": false,
+    "platform": "linux",
+    "arch": "arm64",
+    "build_type": "RelWithDebInfo"
+  },
+  {
+    "version": "21.1.8",
+    "filename": "aarch64-linux-gnu-releasedbg.tar.xz",
+    "sha256": "b9012bf059e4d8673fb564b5780e5fc78c6a2e47f5cc6a39f444d1879b42dd2a",
+    "lto": false,
+    "asan": false,
+    "platform": "linux",
+    "arch": "arm64",
+    "build_type": "RelWithDebInfo"
+  },
+  {
+    "version": "21.1.8",
+    "filename": "aarch64-windows-msvc-releasedbg-lto.tar.xz",
+    "sha256": "8870d16141ba7f9ea12f5147b8d91329abbbaa4376cd4576667dd323d896dd08",
+    "lto": true,
+    "asan": false,
+    "platform": "windows",
+    "arch": "arm64",
+    "build_type": "RelWithDebInfo"
+  },
+  {
+    "version": "21.1.8",
+    "filename": "aarch64-windows-msvc-releasedbg.tar.xz",
+    "sha256": "ad394e79ec85dd40f942671bb0342ffe54a103eb2baabacb773999d57d80134b",
+    "lto": false,
+    "asan": false,
+    "platform": "windows",
+    "arch": "arm64",
+    "build_type": "RelWithDebInfo"
+  },
+  {
+    "version": "21.1.8",
     "filename": "arm64-macos-clang-debug-asan.tar.xz",
-    "sha256": "7da4b7d63edefecaf11773e7e701c575140d1a07329bbbb038673b6ee4516ff5",
+    "sha256": "b02d20e4f7294ee33f49a09dfdd765b3b44135e003ef50e3a760aeee39e3f993",
     "lto": false,
     "asan": true,
     "platform": "macosx",
+    "arch": "arm64",
     "build_type": "Debug"
   },
   {
-    "version": "21.1.4+r1",
+    "version": "21.1.8",
     "filename": "arm64-macos-clang-releasedbg-lto.tar.xz",
-    "sha256": "300455b169448f9f01ae95e3bc269f489558a4ca3955e3032171cc75feca0e30",
+    "sha256": "e40c21eb0d0b91d9d4ab31212a5cb01ea46707f5c29839414567857e4147604d",
     "lto": true,
     "asan": false,
     "platform": "macosx",
+    "arch": "arm64",
     "build_type": "RelWithDebInfo"
   },
   {
-    "version": "21.1.4+r1",
+    "version": "21.1.8",
     "filename": "arm64-macos-clang-releasedbg.tar.xz",
-    "sha256": "9abfc6cd65b957d734ffb97610a634fb4a66d3fbe0fcfb5a1c9124ef693c1495",
+    "sha256": "e1b01de34f0edfd41c118e4981a93afb35556ae369597e864f4a393db623b926",
     "lto": false,
     "asan": false,
     "platform": "macosx",
+    "arch": "arm64",
     "build_type": "RelWithDebInfo"
   },
   {
-    "version": "21.1.4+r1",
+    "version": "21.1.8",
     "filename": "x64-linux-gnu-debug-asan.tar.xz",
-    "sha256": "c1ad3ec476911596a842ac67dd9c9c9475ce9f0a77b81101d3c801840292e7bc",
+    "sha256": "76bb82d822b5377fb5e0fac8abcfba125142e6a0acc02bb36d1fa1532a268646",
     "lto": false,
     "asan": true,
     "platform": "linux",
+    "arch": "x64",
     "build_type": "Debug"
   },
   {
-    "version": "21.1.4+r1",
+    "version": "21.1.8",
     "filename": "x64-linux-gnu-releasedbg-lto.tar.xz",
-    "sha256": "8a869c2184d139dbba704e2d712e7a68336458ad2d70622b3eb906c3e3511e54",
+    "sha256": "32f5edddec1e689124f045b586fb402ae30febc05203af7391b088bc8494cd53",
     "lto": true,
     "asan": false,
     "platform": "linux",
+    "arch": "x64",
     "build_type": "RelWithDebInfo"
   },
   {
-    "version": "21.1.4+r1",
+    "version": "21.1.8",
     "filename": "x64-linux-gnu-releasedbg.tar.xz",
-    "sha256": "552bab86f715d4f2c027f07eaaf5b3d6b8e430af0b74b470142f3f00da4feec6",
+    "sha256": "8ba3c84f23a2a81a86c54780754a61adf99048aa2ac0dc9b9708d0f842d553de",
     "lto": false,
     "asan": false,
     "platform": "linux",
+    "arch": "x64",
     "build_type": "RelWithDebInfo"
   },
   {
-    "version": "21.1.4+r1",
-    "filename": "x64-windows-msvc-debug-asan.tar.xz",
-    "sha256": "093667a493d336c22ff3c604c5f1fea2a7d2c927c1179cec44e9a03726906ac1",
-    "lto": false,
-    "asan": true,
-    "platform": "windows",
-    "build_type": "Debug"
+    "version": "21.1.8",
+    "filename": "x64-macos-clang-releasedbg-lto.tar.xz",
+    "sha256": "97e81d6296896d7237f118f728d05291707b9e4e5791e07ce4be8aee0517505d",
+    "lto": true,
+    "asan": false,
+    "platform": "macosx",
+    "arch": "x64",
+    "build_type": "RelWithDebInfo"
   },
   {
-    "version": "21.1.4+r1",
+    "version": "21.1.8",
+    "filename": "x64-macos-clang-releasedbg.tar.xz",
+    "sha256": "53c13f8e1082fa2fe2f9c05303de48cb3133bf5f24271f4b3062f1dec578159c",
+    "lto": false,
+    "asan": false,
+    "platform": "macosx",
+    "arch": "x64",
+    "build_type": "RelWithDebInfo"
+  },
+  {
+    "version": "21.1.8",
     "filename": "x64-windows-msvc-releasedbg-lto.tar.xz",
-    "sha256": "010539e85621dc3c6ecf359d899feb4075aeca5d0bba6625cdbec0e570e79129",
+    "sha256": "16bcf0e4cbc3d2b1204edd619a3837004dacea28eeff0a101c8d0212f936427d",
     "lto": true,
     "asan": false,
     "platform": "windows",
+    "arch": "x64",
     "build_type": "RelWithDebInfo"
   },
   {
-    "version": "21.1.4+r1",
+    "version": "21.1.8",
     "filename": "x64-windows-msvc-releasedbg.tar.xz",
-    "sha256": "f473c09fbea10053fac00be409d75dc228d4a38bcbc5e4aeb58b56a4b0dde78e",
+    "sha256": "81d31fad05e200726c8178314b0b2045c947483dddd8cb974f4c376ae5f441fa",
     "lto": false,
     "asan": false,
     "platform": "windows",
+    "arch": "x64",
     "build_type": "RelWithDebInfo"
   }
 ]

docs/en/architecture.md

@@ -153,7 +153,7 @@ String values support `${workspace}` substitution.
 
 ## IPC Protocol
 
-The master and workers communicate using custom RPC messages defined in `src/server/protocol.h`. Each message type has a `RequestTraits` or `NotificationTraits` specialization that defines the method name and result type.
+The master and workers communicate using custom RPC messages defined in `src/server/protocol/`. Each message type has a `RequestTraits` or `NotificationTraits` specialization that defines the method name and result type.
 
 ### Stateful Worker Messages
 

pixi.toml

@@ -14,17 +14,24 @@ readme = "README.md"
 documentation = "https://docs.clice.io/clice/"
 repository = "https://github.com/clice-io/clice"
 channels = ["conda-forge"]
-platforms = ["win-64", "linux-64", "osx-arm64"]
+platforms = ["win-64", "linux-64", "osx-arm64", "osx-64", "linux-aarch64", "win-arm64"]
 
 [environments]
 default = ["build", "test"]
 package = ["build", "test", "package"]
+cross-macos-x64 = ["build", "package", "cross-macos-x64"]
+cross-linux-aarch64 = ["build", "package", "cross-linux-aarch64"]
+cross-windows-arm64 = ["build", "package", "cross-windows-arm64"]
 node = ["node"]
 format = ["format"]
+test-run = ["test"]
 
 # ============================================================================== #
 #                                  DEPENDENCIES                                  #
 # ============================================================================== #
+[feature.build]
+platforms = ["win-64", "linux-64", "osx-arm64", "osx-64", "linux-aarch64"]
+
 [feature.build.dependencies]
 python = ">=3.13"
 cmake = ">=3.30"
@@ -35,6 +42,7 @@ lld = "==20.1.8"
 llvm-tools = "==20.1.8"
 clang-tools = "==20.1.8"
 compiler-rt = "==20.1.8"
+flatbuffers = "==25.9.23"
 
 [feature.build.target.win-64.dependencies]
 sccache = "*"
@@ -54,24 +62,69 @@ scripts = ["scripts/activate_linux.sh"]
 [feature.build.target.win-64.activation]
 scripts = ["scripts/activate_asan.bat"]
 
+# macOS x64 (from arm64): clang natively supports cross-arch, no extra deps.
+[feature.cross-macos-x64.target.osx-arm64.dependencies]
+
+[feature.cross-macos-x64.target.osx-arm64.activation]
+scripts = ["scripts/activate_cross_macos.sh"]
+
+# Linux aarch64 (from x64): needs aarch64 sysroot and cross gcc for libstdc++.
+[feature.cross-linux-aarch64.target.linux-64.dependencies]
+sysroot_linux-aarch64 = "==2.17"
+gcc_linux-aarch64 = "==14.2.0"
+gxx_linux-aarch64 = "==14.2.0"
+
+[feature.cross-linux-aarch64.target.linux-64.activation]
+scripts = ["scripts/activate_cross_linux.sh"]
+
+# Windows arm64 (from x64): Windows SDK on CI already includes ARM64 libs.
+[feature.cross-windows-arm64.target.win-64.dependencies]
+
+[feature.cross-windows-arm64.target.win-64.activation]
+scripts = ["scripts/activate_cross_windows.bat"]
+
+[feature.test.dependencies]
+python = ">=3.13"
+
+# On macOS, the system Apple clang emits vendor-specific flags that upstream
+# LLVM cannot parse.  Providing upstream clang + lld in PATH prevents
+# fallback to /usr/bin/clang++ and satisfies toolchain.cmake's -fuse-ld=lld.
+[feature.test.target.osx-64.dependencies]
+clang = "==20.1.8"
+clangxx = "==20.1.8"
+lld = "==20.1.8"
+
+[feature.test.target.osx-arm64.dependencies]
+clang = "==20.1.8"
+clangxx = "==20.1.8"
+lld = "==20.1.8"
+
 [feature.test.pypi-dependencies]
 pytest = "*"
 pytest-asyncio = ">=1.1.0"
+pytest-timeout = "*"
 pygls = ">=2.0.0"
 lsprotocol = ">=2024.0.0"
 
 [feature.package.dependencies]
 xz = ">=5.8.1,<6"
 
-[feature.package.tasks.package]
+[feature.package.tasks.package-config]
+args = [{ arg = "type", default = "RelWithDebInfo" }]
 cmd = """
-cmake -B build/RelWithDebInfo -G Ninja \
-    -DCMAKE_BUILD_TYPE=RelWithDebInfo \
+cmake -B build/{{ type }} -G Ninja \
+    -DCMAKE_BUILD_TYPE={{ type }} \
     -DCMAKE_TOOLCHAIN_FILE=cmake/toolchain.cmake \
-    -DCLICE_RELEASE=ON && \
-cmake --build build/RelWithDebInfo
+    -DCLICE_RELEASE=ON
 """
 
+[feature.package.tasks.package]
+args = [{ arg = "type", default = "RelWithDebInfo" }]
+depends-on = [
+    { task = "package-config", args = ["{{ type }}"] },
+    { task = "cmake-build", args = ["{{ type }}"] },
+]
+
 # ============================================================================== #
 #                                   CMAKE                                        #
 # ============================================================================== #
@@ -79,14 +132,13 @@ cmake --build build/RelWithDebInfo
 args = [
     { arg = "type", default = "RelWithDebInfo" },
     { arg = "ci", default = "OFF" },
-    { arg = "extra", default = "" },
 ]
 cmd = """
 cmake -B build/{{ type }} -G Ninja \
     -DCMAKE_BUILD_TYPE={{ type }} \
     -DCMAKE_TOOLCHAIN_FILE=cmake/toolchain.cmake \
     -DCLICE_ENABLE_TEST=ON \
-    -DCLICE_CI_ENVIRONMENT={{ ci }} {{extra}} \
+    -DCLICE_CI_ENVIRONMENT={{ ci }}
 """
 
 [feature.build.tasks.cmake-build]
@@ -97,10 +149,9 @@ cmd = "cmake --build build/{{ type }}"
 args = [
     { arg = "type", default = "RelWithDebInfo" },
     { arg = "ci", default = "OFF" },
-    { arg = "extra", default = "" },
 ]
 depends-on = [
-    { task = "cmake-config", args = ["{{ type }}", "{{ ci }}", "{{extra}}"] },
+    { task = "cmake-config", args = ["{{ type }}", "{{ ci }}"] },
     { task = "cmake-build", args = ["{{ type }}"] },
 ]
 
@@ -108,15 +159,15 @@ depends-on = [
 args = [{ arg = "type", default = "RelWithDebInfo" }]
 depends-on = [{ task = "lint-cpp", args = ["{{ type }}"] }]
 
-[feature.build.tasks.unit-test]
+[feature.test.tasks.unit-test]
 args = [{ arg = "type", default = "RelWithDebInfo" }]
-cmd = './build/{{ type }}/bin/unit_tests --test-dir="./tests/data"'
+cmd = './build/{{ type }}/bin/unit_tests --test-dir="./tests/data" --snapshot-dir="./tests/snapshots" --corpus-dir="./tests/corpus" --verbose'
 
 [feature.test.tasks.integration-test]
 args = [{ arg = "type", default = "RelWithDebInfo" }]
 cmd = """
-pytest -s --log-cli-level=INFO tests/integration \
-    --executable=./build/{{ type }}/bin/clice
+pytest -s --log-cli-level=INFO --timeout=300 --timeout-method=thread \
+    tests/integration --executable=./build/{{ type }}/bin/clice
 """
 
 [feature.test.tasks.smoke-test]
@@ -131,6 +182,7 @@ args = [{ arg = "type", default = "RelWithDebInfo" }]
 depends-on = [
     { task = "unit-test", args = ["{{ type }}"] },
     { task = "integration-test", args = ["{{ type }}"] },
+    { task = "smoke-test", args = ["{{ type }}"] },
 ]
 
 # ============================================================================== #
@@ -152,9 +204,14 @@ gh workflow run upload-llvm.yml \
 args = ["file_name"]
 cmd = ["scripts/delete-artifacts.bash", "{{ file_name }}"]
 
+[dependencies]
+
 # ============================================================================== #
 #                             DOCS & VSCODE EXTENSION                            #
 # ============================================================================== #
+[feature.node]
+platforms = ["win-64", "linux-64", "osx-arm64", "osx-64", "linux-aarch64"]
+
 [feature.node.dependencies]
 nodejs = ">=20"
 pnpm = "*"
@@ -180,6 +237,9 @@ outputs = ["editors/vscode/node_modules/.modules.yaml"]
 # ============================================================================== #
 #                                    FORMAT                                      #
 # ============================================================================== #
+[feature.format]
+platforms = ["win-64", "linux-64", "osx-arm64", "osx-64", "linux-aarch64"]
+
 [feature.format.dependencies]
 ruff = "*"
 tombi = "*"
@@ -197,7 +257,7 @@ format-markdown = "fd -H -e md -x prettier --write"
 format-json = "fd -H -e json -E package-lock.json -x prettier --write"
 format-toml = "fd -H -e toml -x tombi format"
 format-yaml = """
-fd -H -e yaml -e yml -E pnpm-lock.yaml -x prettier --write && \
+fd -H -e yaml -e yml -E pnpm-lock.yaml -E '*.snap.yml' -x prettier --write && \
 fd -H "^\\.clang-(format|tidy)$" -x prettier --write --parser yaml
 """
 format = { depends-on = [

scripts/activate_cross_linux.sh

@@ -0,0 +1,12 @@
+#!/bin/sh
+# Clear conda cross-gcc flags so host x86_64 paths don't leak into the
+# aarch64 build. conda's gcc_linux-aarch64 activation sets
+# CFLAGS/CXXFLAGS/CPPFLAGS/LDFLAGS with -isystem/-L pointing at $CONDA_PREFIX
+# (x86_64 host paths). LIBRARY_PATH from ld_impl_linux-64 likewise points at
+# host libs. Empty-string export reliably overrides conda-installed values
+# regardless of whether pixi sources or calls this script.
+export CFLAGS=
+export CXXFLAGS=
+export CPPFLAGS=
+export LDFLAGS=
+export LIBRARY_PATH=

scripts/activate_cross_macos.sh

@@ -0,0 +1,8 @@
+#!/bin/sh
+# Clear conda host flags so arm64 host paths don't leak into the x86_64-macos
+# cross build. See scripts/activate_cross_linux.sh for rationale.
+export CFLAGS=
+export CXXFLAGS=
+export CPPFLAGS=
+export LDFLAGS=
+export LIBRARY_PATH=

scripts/activate_cross_windows.bat

@@ -0,0 +1,8 @@
+@echo off
+REM Clear conda host flags so host x64 paths don't leak into the aarch64-windows
+REM cross build. See scripts/activate_cross_linux.sh for rationale.
+set "CFLAGS="
+set "CXXFLAGS="
+set "CPPFLAGS="
+set "LDFLAGS="
+set "LIBRARY_PATH="

scripts/build-llvm.py

@@ -4,6 +4,7 @@ import subprocess
 import shutil
 import argparse
 import os
+import json
 from pathlib import Path
 
 
@@ -22,6 +23,66 @@ def normalize_mode(value: str) -> str:
     )
 
 
+def build_native_tools(project_root: Path, build_dir: Path) -> Path:
+    """Build native host tablegen tools for cross-compilation.
+
+    When cross-compiling LLVM, build tools like llvm-tblgen must run on the
+    host but would otherwise be compiled for the target architecture.  This
+    function performs a minimal native build and returns the bin directory
+    containing host-runnable executables.
+    """
+    native_dir = build_dir.parent / f"{build_dir.name}-native-tools"
+    native_dir.mkdir(exist_ok=True)
+    source_dir = project_root / "llvm"
+
+    cmake_args = [
+        "-G",
+        "Ninja",
+        "-DCMAKE_BUILD_TYPE=Release",
+        "-DLLVM_ENABLE_PROJECTS=clang;clang-tools-extra",
+        "-DLLVM_TARGETS_TO_BUILD=Native",
+        "-DLLVM_DISABLE_ASSEMBLY_FILES=ON",
+        "-DCMAKE_C_FLAGS=-w",
+        "-DCMAKE_CXX_FLAGS=-w",
+    ]
+
+    if sys.platform == "win32":
+        cmake_args += [
+            "-DCMAKE_C_COMPILER=clang-cl",
+            "-DCMAKE_CXX_COMPILER=clang-cl",
+        ]
+    else:
+        cmake_args += [
+            "-DCMAKE_C_COMPILER=clang",
+            "-DCMAKE_CXX_COMPILER=clang++",
+        ]
+
+    print(f"\nConfiguring native host tools in {native_dir}...")
+    subprocess.check_call(
+        ["cmake", "-S", str(source_dir), "-B", str(native_dir)] + cmake_args
+    )
+
+    required_tools = ["llvm-tblgen", "llvm-min-tblgen", "clang-tblgen"]
+    optional_tools = ["clang-tidy-confusable-chars-gen"]
+
+    for tool in required_tools:
+        print(f"Building native {tool}...")
+        subprocess.check_call(["cmake", "--build", str(native_dir), "--target", tool])
+
+    for tool in optional_tools:
+        try:
+            print(f"Building native {tool} (optional)...")
+            subprocess.check_call(
+                ["cmake", "--build", str(native_dir), "--target", tool]
+            )
+        except subprocess.CalledProcessError:
+            print(f"  {tool} not available, skipping.")
+
+    bin_dir = native_dir / "bin"
+    print(f"Native host tools ready in {bin_dir}")
+    return bin_dir
+
+
 def main():
     parser = argparse.ArgumentParser(
         description="Build LLVM with specific configurations."
@@ -48,6 +109,10 @@ def main():
         "--build-dir",
         help="Custom build directory (relative to project root or absolute)",
     )
+    parser.add_argument(
+        "--target-triple",
+        help="Cross-compilation target triple (e.g. x86_64-apple-darwin, aarch64-linux-gnu, aarch64-pc-windows-msvc)",
+    )
 
     args = parser.parse_args()
 
@@ -85,118 +150,46 @@ def main():
     print("--- Configuration ---")
     print(f"Mode:           {args.mode}")
     print(f"LTO:            {args.lto}")
+    print(f"Target Triple:  {args.target_triple or '(native)'}")
     print(f"Root:           {project_root}")
     print(f"Build Dir:      {build_dir}")
     print(f"Install Prefix: {install_prefix}")
     print(f"Toolchain:      {toolchain_file}")
     print("---------------------")
 
-    llvm_distribution_components = [
-        "LLVMDemangle",
-        "LLVMSupport",
-        "LLVMCore",
-        "LLVMOption",
-        "LLVMBinaryFormat",
-        "LLVMMC",
-        "LLVMMCParser",
-        "LLVMObject",
-        "LLVMProfileData",
-        "LLVMBitReader",
-        "LLVMBitstreamReader",
-        "LLVMRemarks",
-        "LLVMObjectYAML",
-        "LLVMAggressiveInstCombine",
-        "LLVMInstCombine",
-        "LLVMIRReader",
-        "LLVMTextAPI",
-        "LLVMSymbolize",
-        "LLVMDebugInfoDWARF",
-        "LLVMDebugInfoDWARFLowLevel",
-        "LLVMDebugInfoCodeView",
-        "LLVMDebugInfoGSYM",
-        "LLVMDebugInfoPDB",
-        "LLVMDebugInfoBTF",
-        "LLVMDebugInfoMSF",
-        "LLVMAsmParser",
-        "LLVMTargetParser",
-        "LLVMTransformUtils",
-        "LLVMAnalysis",
-        "LLVMScalarOpts",
-        "LLVMFrontendHLSL",
-        "LLVMFrontendOpenMP",
-        "LLVMFrontendOffloading",
-        "LLVMFrontendAtomic",
-        "LLVMFrontendDirective",
-        "LLVMWindowsDriver",
-        "clangIndex",
-        "clangAPINotes",
-        "clangAST",
-        "clangASTMatchers",
-        "clangBasic",
-        "clangDriver",
-        "clangFormat",
-        "clangFrontend",
-        "clangLex",
-        "clangParse",
-        "clangSema",
-        "clangSerialization",
-        "clangRewrite",
-        "clangAnalysis",
-        "clangEdit",
-        "clangSupport",
-        "clangStaticAnalyzerCore",
-        "clangStaticAnalyzerFrontend",
-        "clangTidy",
-        "clangTidyUtils",
-        "clangTidyAndroidModule",
-        "clangTidyAbseilModule",
-        "clangTidyAlteraModule",
-        "clangTidyBoostModule",
-        "clangTidyBugproneModule",
-        "clangTidyCERTModule",
-        "clangTidyConcurrencyModule",
-        "clangTidyCppCoreGuidelinesModule",
-        "clangTidyDarwinModule",
-        "clangTidyFuchsiaModule",
-        "clangTidyGoogleModule",
-        "clangTidyHICPPModule",
-        "clangTidyLinuxKernelModule",
-        "clangTidyLLVMModule",
-        "clangTidyLLVMLibcModule",
-        "clangTidyMiscModule",
-        "clangTidyModernizeModule",
-        "clangTidyObjCModule",
-        "clangTidyOpenMPModule",
-        "clangTidyPerformanceModule",
-        "clangTidyPortabilityModule",
-        "clangTidyReadabilityModule",
-        "clangTidyZirconModule",
-        "clangTooling",
-        "clangToolingCore",
-        "clangToolingInclusions",
-        "clangToolingInclusionsStdlib",
-        "clangToolingSyntax",
-        "clangToolingRefactoring",
-        "clangTransformer",
-        "clangCrossTU",
-        "clangAnalysisFlowSensitive",
-        "clangAnalysisFlowSensitiveModels",
-        "clangStaticAnalyzerCheckers",
-        "clangIncludeCleaner",
-        "llvm-headers",
-        "clang-headers",
-        "clang-tidy-headers",
-        "clang-resource-headers",
-    ]
+    components_path = Path(__file__).resolve().parent / "llvm-components.json"
+    with components_path.open() as f:
+        llvm_distribution_components = json.load(f)["components"]
 
     components_joined = ";".join(llvm_distribution_components)
     cmake_args = [
         "-G",
         "Ninja",
-        f"-DCMAKE_TOOLCHAIN_FILE={toolchain_file.as_posix()}",
         f"-DCMAKE_INSTALL_PREFIX={install_prefix}",
-        "-DCMAKE_C_FLAGS=-w",
-        "-DCMAKE_CXX_FLAGS=-w",
+    ]
+
+    if sys.platform == "win32":
+        # Use clang-cl (MSVC driver) on Windows so that LLVM's CMake
+        # generates correct MSVC-style linker flags for LTO, etc.
+        c_flags = "-w"
+        if args.target_triple:
+            c_flags += f" --target={args.target_triple}"
+        cmake_args += [
+            "-DCMAKE_C_COMPILER=clang-cl",
+            "-DCMAKE_CXX_COMPILER=clang-cl",
+            f"-DCMAKE_C_FLAGS={c_flags}",
+            f"-DCMAKE_CXX_FLAGS={c_flags}",
+            "-DLLVM_USE_LINKER=lld-link",
+        ]
+    else:
+        cmake_args += [
+            f"-DCMAKE_TOOLCHAIN_FILE={toolchain_file.as_posix()}",
+            "-DCMAKE_C_FLAGS=-w",
+            "-DCMAKE_CXX_FLAGS=-w",
+            "-DLLVM_USE_LINKER=lld",
+        ]
+
+    cmake_args += [
         "-DLLVM_ENABLE_ZLIB=OFF",
         "-DLLVM_ENABLE_ZSTD=OFF",
         "-DLLVM_ENABLE_LIBXML2=OFF",
@@ -231,7 +224,6 @@ def main():
         "-DCMAKE_JOB_POOL_LINK=console",
         "-DLLVM_ENABLE_PROJECTS=clang;clang-tools-extra",
         "-DLLVM_TARGETS_TO_BUILD=all",
-        "-DLLVM_USE_LINKER=lld",
         "-DLLVM_DISABLE_ASSEMBLY_FILES=ON",
         # Distribution
         f"-DLLVM_DISTRIBUTION_COMPONENTS={components_joined}",
@@ -256,8 +248,10 @@ def main():
     is_shared = "OFF"
     if args.mode == "Debug":
         cmake_args.append("-DCMAKE_BUILD_TYPE=Debug")
-        cmake_args.append("-DLLVM_USE_SANITIZER=Address")
-        is_shared = "ON"
+        # ASAN is incompatible with -MDd on Windows (clang-cl), skip it there.
+        if sys.platform != "win32":
+            cmake_args.append("-DLLVM_USE_SANITIZER=Address")
+            is_shared = "ON"
     elif args.mode == "Release":
         cmake_args.append("-DCMAKE_BUILD_TYPE=Release")
     elif args.mode == "RelWithDebInfo":
@@ -272,6 +266,24 @@ def main():
     else:
         cmake_args.append("-DLLVM_ENABLE_LTO=OFF")
 
+    if args.target_triple:
+        cmake_args.append(f"-DCLICE_TARGET_TRIPLE={args.target_triple}")
+        cmake_args.append(f"-DLLVM_HOST_TRIPLE={args.target_triple}")
+
+        # When cross-compiling, clear conda's host-platform flags so they
+        # don't leak into the target build (e.g. -L pointing to x86_64 libs).
+        # This must happen before the native-tools build too so we don't
+        # contaminate the native configure with target-arch link flags.
+        for var in ["LIBRARY_PATH", "LDFLAGS", "CFLAGS", "CXXFLAGS", "CPPFLAGS"]:
+            os.environ.pop(var, None)
+
+        # Cross-compilation needs native host tools (tablegen, etc.) that can
+        # run on the build machine.  macOS handles this transparently via
+        # Rosetta 2, but Linux and Windows require a separate native build.
+        if sys.platform != "darwin":
+            native_bin_dir = build_native_tools(project_root, build_dir)
+            cmake_args.append(f"-DLLVM_NATIVE_TOOL_DIR={native_bin_dir}")
+
     build_dir.mkdir(exist_ok=True)
 
     print(f"\nConfiguring in {build_dir}...")

scripts/llvm-components.json

@@ -0,0 +1,99 @@
+{
+  "components": [
+    "LLVMDemangle",
+    "LLVMSupport",
+    "LLVMCore",
+    "LLVMOption",
+    "LLVMBinaryFormat",
+    "LLVMMC",
+    "LLVMMCParser",
+    "LLVMObject",
+    "LLVMProfileData",
+    "LLVMBitReader",
+    "LLVMBitstreamReader",
+    "LLVMRemarks",
+    "LLVMObjectYAML",
+    "LLVMAggressiveInstCombine",
+    "LLVMInstCombine",
+    "LLVMIRReader",
+    "LLVMTextAPI",
+    "LLVMSymbolize",
+    "LLVMDebugInfoDWARF",
+    "LLVMDebugInfoDWARFLowLevel",
+    "LLVMDebugInfoCodeView",
+    "LLVMDebugInfoGSYM",
+    "LLVMDebugInfoPDB",
+    "LLVMDebugInfoBTF",
+    "LLVMDebugInfoMSF",
+    "LLVMAsmParser",
+    "LLVMTargetParser",
+    "LLVMTransformUtils",
+    "LLVMAnalysis",
+    "LLVMScalarOpts",
+    "LLVMFrontendHLSL",
+    "LLVMFrontendOpenMP",
+    "LLVMFrontendOffloading",
+    "LLVMFrontendAtomic",
+    "LLVMFrontendDirective",
+    "LLVMWindowsDriver",
+    "clangIndex",
+    "clangAPINotes",
+    "clangAST",
+    "clangASTMatchers",
+    "clangBasic",
+    "clangDriver",
+    "clangFormat",
+    "clangFrontend",
+    "clangLex",
+    "clangParse",
+    "clangSema",
+    "clangSerialization",
+    "clangRewrite",
+    "clangAnalysis",
+    "clangEdit",
+    "clangSupport",
+    "clangStaticAnalyzerCore",
+    "clangStaticAnalyzerFrontend",
+    "clangTidy",
+    "clangTidyUtils",
+    "clangTidyAndroidModule",
+    "clangTidyAbseilModule",
+    "clangTidyAlteraModule",
+    "clangTidyBoostModule",
+    "clangTidyBugproneModule",
+    "clangTidyCERTModule",
+    "clangTidyConcurrencyModule",
+    "clangTidyCppCoreGuidelinesModule",
+    "clangTidyDarwinModule",
+    "clangTidyFuchsiaModule",
+    "clangTidyGoogleModule",
+    "clangTidyHICPPModule",
+    "clangTidyLinuxKernelModule",
+    "clangTidyLLVMModule",
+    "clangTidyLLVMLibcModule",
+    "clangTidyMiscModule",
+    "clangTidyModernizeModule",
+    "clangTidyObjCModule",
+    "clangTidyOpenMPModule",
+    "clangTidyPerformanceModule",
+    "clangTidyPortabilityModule",
+    "clangTidyReadabilityModule",
+    "clangTidyZirconModule",
+    "clangTooling",
+    "clangToolingCore",
+    "clangToolingInclusions",
+    "clangToolingInclusionsStdlib",
+    "clangToolingSyntax",
+    "clangToolingRefactoring",
+    "clangTransformer",
+    "clangCrossTU",
+    "clangAnalysisFlowSensitive",
+    "clangAnalysisFlowSensitiveModels",
+    "clangStaticAnalyzerCheckers",
+    "clangIncludeCleaner",
+    "llvm-headers",
+    "clang-headers",
+    "clang-tidy-headers",
+    "clang-resource-headers"
+  ]
+}

scripts/prune-llvm-bin.py

@@ -16,7 +16,10 @@ import subprocess
 import time
 from datetime import datetime, timezone
 from pathlib import Path
-from typing import Iterable, List, Optional
+from typing import Iterable, List, Optional, Set
+
+
+LLVM_COMPONENTS_FILE = Path(__file__).with_name("llvm-components.json")
 
 
 def parse_args() -> argparse.Namespace:
@@ -102,12 +105,33 @@ def run_build(build_dir: Path) -> bool:
         return False
 
 
+def protected_library_names() -> Set[str]:
+    data = json.loads(LLVM_COMPONENTS_FILE.read_text())
+    components = data.get("components", [])
+    if not isinstance(components, list):
+        raise ValueError(f"{LLVM_COMPONENTS_FILE} missing 'components' list")
+
+    names: Set[str] = set()
+    for component in components:
+        if not isinstance(component, str):
+            continue
+        if not (component.startswith("clangTidy") and component.endswith("Module")):
+            continue
+        names.add(f"lib{component}.a")
+        names.add(f"{component}.lib")
+    return names
+
+
 def candidate_files(install_dir: Path) -> Iterable[Path]:
     if not install_dir.is_dir():
         raise FileNotFoundError(f"lib dir not found: {install_dir}")
+    protected = protected_library_names()
     for path in sorted(install_dir.iterdir()):
         if not path.is_file():
             continue
+        if path.name in protected:
+            print(f"Keeping protected clang-tidy module library: {path.name}")
+            continue
         if path.suffix.lower() in {".a", ".lib"}:
             yield path
         else:
@@ -156,7 +180,11 @@ def apply_manifest(manifest: Path, install_dir: Path) -> None:
     removed = data.get("removed", [])
     if not isinstance(removed, list):
         raise ValueError("Manifest missing 'removed' list")
+    protected = protected_library_names()
     for name in removed:
+        if name in protected:
+            print(f"Keeping protected clang-tidy module library from manifest: {name}")
+            continue
         target = install_dir / name
         if target.exists():
             print(f"Deleting {target}")

scripts/setup-llvm.py

@@ -40,23 +40,52 @@ def detect_platform() -> str:
     raise RuntimeError(f"Unsupported platform: {plat}")
 
 
+def detect_arch() -> str:
+    import platform
+
+    machine = platform.machine().lower()
+    if machine in ("x86_64", "amd64"):
+        return "x64"
+    if machine in ("aarch64", "arm64"):
+        return "arm64"
+    raise RuntimeError(f"Unsupported architecture: {machine}")
+
+
 def pick_artifact(
-    manifest: list[dict], version: str, build_type: str, is_lto: bool, platform: str
+    manifest: list[dict],
+    version: str,
+    build_type: str,
+    is_lto: bool,
+    platform: str,
+    arch: str,
 ) -> dict:
     base_version = version.split("+", 1)[0]
+    saw_missing_arch = False
     for entry in manifest:
         if entry.get("version") != version:
             continue
         if entry.get("platform") != platform.lower():
             continue
+        entry_arch = entry.get("arch")
+        if entry_arch is None:
+            saw_missing_arch = True
+            continue
+        if entry_arch != arch:
+            continue
         if entry.get("build_type") != build_type:
             continue
         if bool(entry.get("lto")) != is_lto:
             continue
         return entry
+    if saw_missing_arch:
+        raise RuntimeError(
+            f"Manifest contains entries without an 'arch' field for version={base_version}, "
+            f"platform={platform}. The manifest format changed to require explicit "
+            f"architectures; regenerate it via scripts/update-llvm-version.py."
+        )
     raise RuntimeError(
         f"No matching LLVM artifact in manifest for version={base_version}, platform={platform}, "
-        f"build_type={build_type}, lto={is_lto}"
+        f"arch={arch}, build_type={build_type}, lto={is_lto}"
     )
 
 
@@ -264,6 +293,14 @@ def main() -> None:
     parser.add_argument("--install-path")
     parser.add_argument("--enable-lto", action="store_true")
     parser.add_argument("--offline", action="store_true")
+    parser.add_argument(
+        "--target-platform",
+        help="Override platform for cross-compilation (e.g. macosx, linux, windows)",
+    )
+    parser.add_argument(
+        "--target-arch",
+        help="Override architecture for cross-compilation (e.g. x64, arm64)",
+    )
     parser.add_argument("--output", required=True)
     args = parser.parse_args()
 
@@ -275,8 +312,11 @@ def main() -> None:
     )
     token = os.environ.get("GH_TOKEN") or os.environ.get("GITHUB_TOKEN")
     build_type = args.build_type
-    platform_name = detect_platform()
-    log(f"Platform detected: {platform_name}, normalized build type: {build_type}")
+    platform_name = args.target_platform if args.target_platform else detect_platform()
+    arch_name = args.target_arch if args.target_arch else detect_arch()
+    log(
+        f"Platform: {platform_name}, arch: {arch_name}, normalized build type: {build_type}"
+    )
     manifest = read_manifest(Path(args.manifest))
 
     binary_dir = Path(args.binary_dir).resolve()
@@ -304,7 +344,12 @@ def main() -> None:
     if install_path is None:
         needs_install = True
         artifact = pick_artifact(
-            manifest, args.version, build_type, args.enable_lto, platform_name
+            manifest,
+            args.version,
+            build_type,
+            args.enable_lto,
+            platform_name,
+            arch_name,
         )
         log(f"Selected artifact: {artifact.get('filename')} for download")
         filename = artifact["filename"]
@@ -317,7 +362,12 @@ def main() -> None:
         install_path = install_root
     elif needs_install:
         artifact = pick_artifact(
-            manifest, args.version, build_type, args.enable_lto, platform_name
+            manifest,
+            args.version,
+            build_type,
+            args.enable_lto,
+            platform_name,
+            arch_name,
         )
         log(f"Selected artifact: {artifact.get('filename')} for download")
         filename = artifact["filename"]

scripts/update-llvm-version.py

@@ -0,0 +1,162 @@
+#!/usr/bin/env python3
+
+import argparse
+import json
+import re
+import sys
+from pathlib import Path
+
+
+def copy_manifest(src: Path, dest: Path) -> None:
+    text = src.read_text(encoding="utf-8")
+
+    try:
+        data = json.loads(text)
+    except json.JSONDecodeError as err:
+        print(f"Error: {src} is not valid JSON: {err}", file=sys.stderr)
+        sys.exit(1)
+
+    if not isinstance(data, list) or len(data) == 0:
+        print(f"Error: {src} must be a non-empty JSON array", file=sys.stderr)
+        sys.exit(1)
+
+    dest.parent.mkdir(parents=True, exist_ok=True)
+    with dest.open("w", encoding="utf-8") as handle:
+        json.dump(data, handle, indent=2)
+        handle.write("\n")
+
+    print(f"Copied manifest: {src} -> {dest} ({len(data)} entries)")
+
+
+def update_package_cmake(path: Path, version: str) -> None:
+    text = path.read_text(encoding="utf-8")
+
+    pattern = r'setup_llvm\("[^"]*"\)'
+    matches = re.findall(pattern, text)
+
+    if len(matches) == 0:
+        print(f"Error: no setup_llvm(...) call found in {path}", file=sys.stderr)
+        sys.exit(1)
+
+    if len(matches) > 1:
+        print(
+            f"Error: expected exactly 1 setup_llvm(...) call in {path}, "
+            f"found {len(matches)}",
+            file=sys.stderr,
+        )
+        sys.exit(1)
+
+    old_call = matches[0]
+    new_call = f'setup_llvm("{version}")'
+
+    if old_call == new_call:
+        print(f"Version in {path} is already {version}, no change needed")
+        return
+
+    updated = text.replace(old_call, new_call)
+    path.write_text(updated, encoding="utf-8")
+    print(f"Updated {path}: {old_call} -> {new_call}")
+
+
+def check_package_cmake(path: Path) -> None:
+    """Verify package.cmake has exactly one setup_llvm(...) call that the
+    update script can rewrite. Used by CI to catch drift before the next bump."""
+    text = path.read_text(encoding="utf-8")
+    matches = re.findall(r'setup_llvm\("[^"]*"\)', text)
+    if len(matches) == 0:
+        print(f"Error: no setup_llvm(...) call found in {path}", file=sys.stderr)
+        sys.exit(1)
+    if len(matches) > 1:
+        print(
+            f"Error: expected exactly 1 setup_llvm(...) call in {path}, "
+            f"found {len(matches)}: {matches}",
+            file=sys.stderr,
+        )
+        sys.exit(1)
+    print(f"OK: {path} has a single setup_llvm(...) call: {matches[0]}")
+
+
+def check_manifest(path: Path) -> None:
+    """Verify the manifest is a well-formed non-empty array with required fields."""
+    try:
+        data = json.loads(path.read_text(encoding="utf-8"))
+    except json.JSONDecodeError as err:
+        print(f"Error: {path} is not valid JSON: {err}", file=sys.stderr)
+        sys.exit(1)
+    if not isinstance(data, list) or len(data) == 0:
+        print(f"Error: {path} must be a non-empty JSON array", file=sys.stderr)
+        sys.exit(1)
+    required = ("version", "platform", "arch", "build_type", "filename", "sha256")
+    for idx, entry in enumerate(data):
+        missing = [k for k in required if k not in entry]
+        if missing:
+            print(
+                f"Error: {path} entry {idx} is missing fields: {missing}",
+                file=sys.stderr,
+            )
+            sys.exit(1)
+    print(f"OK: {path} has {len(data)} well-formed entries")
+
+
+def main() -> None:
+    parser = argparse.ArgumentParser(
+        description="Update LLVM version references in the clice project."
+    )
+    parser.add_argument(
+        "--check",
+        action="store_true",
+        help="Validate existing state without modifying files (for CI drift checks)",
+    )
+    parser.add_argument(
+        "--version",
+        help="New LLVM version string (e.g. 21.2.0); required unless --check",
+    )
+    parser.add_argument(
+        "--manifest-src",
+        help="Path to the source llvm-manifest.json; required unless --check",
+    )
+    parser.add_argument(
+        "--manifest-dest",
+        required=True,
+        help="Path to destination manifest (e.g. config/llvm-manifest.json)",
+    )
+    parser.add_argument(
+        "--package-cmake",
+        required=True,
+        help="Path to cmake/package.cmake",
+    )
+    args = parser.parse_args()
+
+    manifest_dest = Path(args.manifest_dest)
+    package_cmake = Path(args.package_cmake)
+
+    if not package_cmake.is_file():
+        print(f"Error: package.cmake not found: {package_cmake}", file=sys.stderr)
+        sys.exit(1)
+
+    if args.check:
+        check_package_cmake(package_cmake)
+        check_manifest(manifest_dest)
+        print("Done (check mode).")
+        return
+
+    if not args.version or not args.manifest_src:
+        print(
+            "Error: --version and --manifest-src are required unless --check is set",
+            file=sys.stderr,
+        )
+        sys.exit(1)
+
+    manifest_src = Path(args.manifest_src)
+    if not manifest_src.is_file():
+        print(f"Error: manifest source not found: {manifest_src}", file=sys.stderr)
+        sys.exit(1)
+
+    copy_manifest(manifest_src, manifest_dest)
+    update_package_cmake(package_cmake, args.version)
+
+    print("Done.")
+
+
+if __name__ == "__main__":
+    main()

scripts/upload-llvm.py

@@ -27,6 +27,15 @@ def parse_platform(name: str) -> str:
     raise ValueError(f"Unable to determine platform from filename: {name}")
 
 
+def parse_arch(name: str) -> str:
+    lowered = name.lower()
+    if lowered.startswith("aarch64-") or lowered.startswith("arm64-"):
+        return "arm64"
+    if lowered.startswith("x64-") or lowered.startswith("x86_64-"):
+        return "x64"
+    raise ValueError(f"Unable to determine arch from filename: {name}")
+
+
 def parse_build_type(name: str) -> str:
     lowered = name.lower()
     if "debug" in lowered:
@@ -43,6 +52,7 @@ def build_metadata_entry(path: Path, version: str) -> dict:
         "lto": "-lto" in filename.lower(),
         "asan": "-asan" in filename.lower(),
         "platform": parse_platform(filename),
+        "arch": parse_arch(filename),
         "build_type": parse_build_type(filename),
     }
 

scripts/validate-llvm-components.py

@@ -0,0 +1,163 @@
+#!/usr/bin/env python3
+"""
+Validate the LLVM distribution component list against the actual LLVM source tree.
+
+Scans the LLVM source for CMake library targets and compares them against
+a components JSON file to detect stale or misspelled entries.
+"""
+
+import argparse
+import difflib
+import json
+import re
+import sys
+from pathlib import Path
+
+
+# CMake function calls that define library targets.
+# The captured group uses [^\s)]+  to grab the target name without
+# trailing parentheses or whitespace.
+LLVM_LIB_PATTERNS = [
+    re.compile(r"add_llvm_component_library\(\s*([^\s)]+)"),
+    re.compile(r"add_llvm_library\(\s*([^\s)]+)"),
+]
+
+CLANG_LIB_PATTERNS = [
+    re.compile(r"add_clang_library\(\s*([^\s)]+)"),
+]
+
+# Header-only / custom install targets.
+HEADER_PATTERNS = [
+    re.compile(r"add_llvm_install_targets\(\s*([^\s)]+)"),
+    re.compile(r"add_custom_target\(\s*([^\s)]+)"),
+    re.compile(r"add_library\(\s*([^\s)]+)"),
+]
+
+# Targets we recognise as header-only distribution components.
+KNOWN_HEADER_TARGETS = {
+    "llvm-headers",
+    "clang-headers",
+    "clang-tidy-headers",
+    "clang-resource-headers",
+}
+
+
+def scan_targets(directory: Path, patterns: list[re.Pattern]) -> set[str]:
+    """Recursively scan *directory* for CMakeLists.txt files and extract target names."""
+    targets: set[str] = set()
+    if not directory.is_dir():
+        return targets
+    for cmake_file in directory.rglob("CMakeLists.txt"):
+        text = cmake_file.read_text(errors="replace")
+        for pattern in patterns:
+            for match in pattern.finditer(text):
+                targets.add(match.group(1))
+    return targets
+
+
+def scan_header_targets(llvm_src: Path) -> set[str]:
+    """Scan for well-known header / custom-install targets across the tree."""
+    found: set[str] = set()
+    for cmake_file in llvm_src.rglob("CMakeLists.txt"):
+        text = cmake_file.read_text(errors="replace")
+        for pattern in HEADER_PATTERNS:
+            for match in pattern.finditer(text):
+                name = match.group(1)
+                if name in KNOWN_HEADER_TARGETS:
+                    found.add(name)
+    return found
+
+
+def collect_source_targets(llvm_src: Path) -> set[str]:
+    """Return the full set of library / header targets found in the LLVM source tree."""
+    targets: set[str] = set()
+    targets |= scan_targets(llvm_src / "llvm" / "lib", LLVM_LIB_PATTERNS)
+    targets |= scan_targets(llvm_src / "clang" / "lib", CLANG_LIB_PATTERNS)
+    targets |= scan_targets(llvm_src / "clang-tools-extra", CLANG_LIB_PATTERNS)
+    targets |= scan_header_targets(llvm_src)
+    return targets
+
+
+def load_components(path: Path) -> list[str]:
+    with path.open("r", encoding="utf-8") as handle:
+        data = json.load(handle)
+    if isinstance(data, dict):
+        data = data.get("components", [])
+    if not isinstance(data, list) or not data:
+        print(f"Error: no component list found in {path}", file=sys.stderr)
+        sys.exit(1)
+    return data
+
+
+def main() -> None:
+    parser = argparse.ArgumentParser(
+        description="Validate LLVM distribution components against the source tree."
+    )
+    parser.add_argument(
+        "--llvm-src",
+        required=True,
+        help="Path to the llvm-project source root",
+    )
+    parser.add_argument(
+        "--components-file",
+        required=True,
+        help="Path to llvm-components.json",
+    )
+    args = parser.parse_args()
+
+    llvm_src = Path(args.llvm_src).expanduser().resolve()
+    components_file = Path(args.components_file).expanduser().resolve()
+
+    if not llvm_src.is_dir():
+        print(f"Error: LLVM source directory not found: {llvm_src}")
+        sys.exit(1)
+
+    if not (llvm_src / "llvm" / "CMakeLists.txt").exists():
+        print(f"Error: {llvm_src} does not look like an llvm-project root.")
+        sys.exit(1)
+
+    if not components_file.is_file():
+        print(f"Error: components file not found: {components_file}")
+        sys.exit(1)
+
+    components = load_components(components_file)
+    source_targets = collect_source_targets(llvm_src)
+
+    print(f"Found {len(source_targets)} targets in LLVM source tree")
+    print(f"Components file lists {len(components)} entries")
+
+    # Check for components that are missing from the source tree.
+    missing: list[tuple[str, list[str]]] = []
+    for name in components:
+        if name not in source_targets:
+            suggestions = difflib.get_close_matches(
+                name, source_targets, n=3, cutoff=0.6
+            )
+            missing.append((name, suggestions))
+
+    if missing:
+        print(f"\nError: {len(missing)} component(s) not found in the source tree:\n")
+        for name, suggestions in missing:
+            print(f"  - {name}")
+            if suggestions:
+                print(f"    Did you mean: {', '.join(suggestions)}?")
+        sys.exit(1)
+
+    # Warn about source targets not present in the component list.
+    component_set = set(components)
+    new_targets = sorted(source_targets - component_set - KNOWN_HEADER_TARGETS)
+    # Filter to targets that follow LLVM/Clang naming conventions to reduce noise.
+    noteworthy = [t for t in new_targets if t.startswith(("LLVM", "clang", "Clang"))]
+    if noteworthy:
+        print(
+            f"\nWarning: {len(noteworthy)} target(s) in source not listed in components:"
+        )
+        for name in noteworthy:
+            print(f"  + {name}")
+
+    print("\nAll components validated successfully.")
+    sys.exit(0)
+
+
+if __name__ == "__main__":
+    main()

src/clice.cc

@@ -4,33 +4,33 @@
 #include <print>
 #include <string>
 
-#include "server/master_server.h"
-#include "server/stateful_worker.h"
-#include "server/stateless_worker.h"
+#include "server/service/agentic.h"
+#include "server/service/master_server.h"
+#include "server/worker/stateful_worker.h"
+#include "server/worker/stateless_worker.h"
 #include "support/logging.h"
 
-#include "kota/async/async.h"
 #include "kota/deco/deco.h"
-#include "kota/ipc/codec/json.h"
-#include "kota/ipc/peer.h"
-#include "kota/ipc/recording_transport.h"
-#include "kota/ipc/transport.h"
 
 namespace clice {
 
 using kota::deco::decl::KVStyle;
 
 struct Options {
-    DecoKV(style = KVStyle::JoinedOrSeparate,
-           help = "Running mode: pipe, socket, stateless-worker, stateful-worker",
-           required = false)
+    DecoKV(
+        style = KVStyle::JoinedOrSeparate,
+        help =
+            "Running mode: pipe, socket, daemon, relay, agentic, stateless-worker, stateful-worker",
+        required = false)
     <std::string> mode;
 
     DecoKV(style = KVStyle::JoinedOrSeparate, help = "Socket mode address", required = false)
     <std::string> host = "127.0.0.1";
 
-    DecoKV(style = KVStyle::JoinedOrSeparate, help = "Socket mode port", required = false)
-    <int> port = 50051;
+    DecoKV(style = KVStyle::JoinedOrSeparate,
+           help = "Agentic TCP port (0 = disabled)",
+           required = false)
+    <int> port = 0;
 
     DecoKV(style = KVStyle::JoinedOrSeparate,
            names = {"--log-level", "--log-level="},
@@ -43,6 +43,50 @@ struct Options {
            required = false)
     <std::string> record;
 
+    DecoKV(style = KVStyle::JoinedOrSeparate,
+           help = "File path for agentic queries",
+           required = false)
+    <std::string> path;
+
+    DecoKV(
+        style = KVStyle::JoinedOrSeparate,
+        help =
+            "Agentic method (compileCommand, symbolSearch, definition, references, "
+            "documentSymbols, readSymbol, callGraph, typeHierarchy, projectFiles, "
+            "lint, fileDeps, impactAnalysis, status, shutdown)",
+        required = false)
+    <std::string> method;
+
+    DecoKV(style = KVStyle::JoinedOrSeparate,
+           help = "Symbol name for agentic queries",
+           required = false)
+    <std::string> name;
+
+    DecoKV(style = KVStyle::JoinedOrSeparate,
+           help = "Search query for symbolSearch",
+           required = false)
+    <std::string> query;
+
+    DecoKV(style = KVStyle::JoinedOrSeparate,
+           help = "Line number for position-based lookup",
+           required = false)
+    <int> line;
+
+    DecoKV(style = KVStyle::JoinedOrSeparate,
+           help = "Direction: callers/callees or supertypes/subtypes",
+           required = false)
+    <std::string> direction;
+
+    DecoKV(style = KVStyle::JoinedOrSeparate,
+           help = "Unix domain socket path for daemon mode",
+           required = false)
+    <std::string> socket;
+
+    DecoKV(style = KVStyle::JoinedOrSeparate,
+           help = "Workspace root directory for daemon mode",
+           required = false)
+    <std::string> workspace;
+
     // Internal options (passed from master to worker processes)
     DecoKV(style = KVStyle::JoinedOrSeparate,
            names = {"--worker-memory-limit", "--worker-memory-limit="},
@@ -68,9 +112,6 @@ struct Options {
 
 int main(int argc, const char** argv) {
 #ifndef _WIN32
-    // On POSIX systems, ignore SIGPIPE so that writing to a closed pipe
-    // (e.g. when the LSP client disconnects) returns EPIPE instead of
-    // killing the process.  This is standard practice for pipe-based servers.
     signal(SIGPIPE, SIG_IGN);
 #endif
 
@@ -110,8 +151,6 @@ int main(int argc, const char** argv) {
         return 1;
     }
 
-    std::string self_path = argv[0];
-
     auto& mode = *opts.mode;
 
     auto worker_name = opts.worker_name.value_or("");
@@ -131,77 +170,51 @@ int main(int argc, const char** argv) {
                                                log_dir);
     }
 
-    if(mode == "pipe") {
-        clice::logging::stderr_logger("master", clice::logging::options);
-
-        kota::event_loop loop;
-
-        auto transport = kota::ipc::StreamTransport::open_stdio(loop);
-        if(!transport) {
-            LOG_ERROR("failed to open stdio transport");
-            return 1;
-        }
-
-        std::unique_ptr<kota::ipc::Transport> final_transport = std::move(*transport);
-        if(opts.record.has_value()) {
-            final_transport =
-                std::make_unique<kota::ipc::RecordingTransport>(std::move(final_transport),
-                                                                *opts.record);
-        }
-
-        kota::ipc::JsonPeer peer(loop, std::move(final_transport));
-        clice::MasterServer server(loop, peer, std::move(self_path));
-        server.register_handlers();
-
-        loop.schedule(peer.run());
-        loop.run();
-        return 0;
+    if(mode == "pipe" || mode == "socket") {
+        clice::ServerOptions server_opts;
+        server_opts.mode = mode;
+        server_opts.host = opts.host.value_or("127.0.0.1");
+        server_opts.port = opts.port.value_or(0);
+        server_opts.self_path = argv[0];
+        server_opts.record = opts.record.value_or("");
+        return clice::run_server_mode(server_opts);
     }
 
-    if(mode == "socket") {
-        clice::logging::stderr_logger("master", clice::logging::options);
-
-        kota::event_loop loop;
-
-        auto host = opts.host.value_or("127.0.0.1");
-        auto port = opts.port.value_or(50051);
-
-        auto acceptor = kota::tcp::listen(host, port, {}, loop);
-        if(!acceptor) {
-            LOG_ERROR("failed to listen on {}:{}", host, port);
+    if(mode == "daemon") {
+        auto workspace = opts.workspace.value_or("");
+        if(workspace.empty()) {
+            LOG_ERROR("--workspace is required for daemon mode");
             return 1;
         }
 
-        LOG_INFO("Listening on {}:{} ...", host, port);
+        clice::DaemonOptions daemon_opts;
+        daemon_opts.socket_path = opts.socket.value_or("");
+        daemon_opts.workspace = std::move(workspace);
+        daemon_opts.self_path = argv[0];
+        return clice::run_daemon_mode(daemon_opts);
+    }
 
-        auto task = [&]() -> kota::task<> {
-            auto client = co_await acceptor->accept();
-            if(!client.has_value()) {
-                LOG_ERROR("failed to accept connection");
-                loop.stop();
-                co_return;
-            }
+    if(mode == "agentic") {
+        auto port = opts.port.value_or(0);
+        if(port <= 0) {
+            LOG_ERROR("--port is required for agentic mode");
+            return 1;
+        }
+        clice::AgenticQueryOptions aq;
+        aq.host = opts.host.value_or("127.0.0.1");
+        aq.port = port;
+        aq.method = opts.method.value_or("compileCommand");
+        aq.path = opts.path.value_or("");
+        aq.name = opts.name.value_or("");
+        aq.query = opts.query.value_or("");
+        aq.line = opts.line.value_or(0);
+        aq.direction = opts.direction.value_or("");
+        return clice::run_agentic_mode(aq);
+    }
 
-            LOG_INFO("Client connected");
-
-            std::unique_ptr<kota::ipc::Transport> transport =
-                std::make_unique<kota::ipc::StreamTransport>(std::move(client.value()));
-            if(opts.record.has_value()) {
-                transport = std::make_unique<kota::ipc::RecordingTransport>(std::move(transport),
-                                                                            *opts.record);
-            }
-            kota::ipc::JsonPeer peer(loop, std::move(transport));
-            clice::MasterServer server(loop, peer, std::string(self_path));
-            server.register_handlers();
-
-            co_await peer.run();
-            peer.close();
-            loop.stop();
-        };
-
-        loop.schedule(task());
-        loop.run();
-        return 0;
+    if(mode == "relay") {
+        auto socket = opts.socket.value_or("");
+        return clice::run_relay_mode(socket);
     }
 
     LOG_ERROR("unknown mode '{}'", mode);

src/command/toolchain.cpp

@@ -9,6 +9,7 @@
 #include "support/logging.h"
 
 #include "kota/meta/enum.h"
+#include "llvm/ADT/DenseSet.h"
 #include "llvm/ADT/ScopeExit.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/FileSystem.h"
@@ -17,6 +18,7 @@
 #include "llvm/TargetParser/Host.h"
 #include "clang/Driver/Compilation.h"
 #include "clang/Driver/Driver.h"
+#include "clang/Driver/Options.h"
 #include "clang/Driver/Tool.h"
 
 #ifndef _WIN32
@@ -470,11 +472,32 @@ std::vector<const char*> query_clang_toolchain(const QueryParams& params) {
                 continue;
             }
 
-            for(auto arg: args) {
-                if(arg == "-###"sv) {
+            // FIXME: the system compiler may be newer than our embedded LLVM,
+            // producing cc1 flags we don't recognize. Filter them out here.
+            // Long-term we should unify the command pipeline so the driver
+            // version always matches the embedded LLVM.
+            auto& table = clang::driver::getDriverOptTable();
+            auto cc1_args = llvm::ArrayRef(args).drop_front(2);
+            unsigned missing_index = 0, missing_count = 0;
+            auto parsed = table.ParseArgs(cc1_args, missing_index, missing_count);
+
+            llvm::DenseSet<unsigned> unknown_indices;
+            for(auto* a: parsed) {
+                if(a->getOption().getKind() == llvm::opt::Option::UnknownClass) {
+                    unknown_indices.insert(a->getIndex());
+                }
+            }
+
+            result.emplace_back(params.callback(args[0]));
+            result.emplace_back(params.callback(args[1]));
+            for(unsigned i = 0; i < cc1_args.size(); ++i) {
+                if(unknown_indices.contains(i)) {
                     continue;
                 }
-                result.emplace_back(params.callback(arg));
+                if(cc1_args[i] == "-###"sv) {
+                    continue;
+                }
+                result.emplace_back(params.callback(cc1_args[i]));
             }
         }
     }

src/compile/compilation.cpp

@@ -219,9 +219,10 @@ public:
 
     auto CreateASTConsumer(clang::CompilerInstance& instance, llvm::StringRef file)
         -> std::unique_ptr<clang::ASTConsumer> final {
-        return std::make_unique<ProxyASTConsumer>(
-            WrapperFrontendAction::CreateASTConsumer(instance, file),
-            unit);
+        auto consumer = WrapperFrontendAction::CreateASTConsumer(instance, file);
+        if(!consumer)
+            return nullptr;
+        return std::make_unique<ProxyASTConsumer>(std::move(consumer), unit);
     }
 
     /// Make this public.
@@ -417,6 +418,8 @@ CompilationUnit compile(CompilationParams& params, PCMInfo& out) {
 }
 
 CompilationUnit complete(CompilationParams& params, clang::CodeCompleteConsumer* consumer) {
+    params.kind = CompilationKind::Completion;
+
     auto& [file, offset] = params.completion;
 
     /// The location of clang is 1-1 based.

src/compile/compilation.h

@@ -65,7 +65,7 @@ struct PCMInfo : ModuleInfo {
 
 struct CompilationParams {
     /// The kind of this compilation.
-    CompilationKind kind;
+    CompilationKind kind = CompilationKind::Content;
 
     /// Whether to run clang-tidy.
     bool clang_tidy = false;

src/compile/compilation_unit.cpp

@@ -81,7 +81,8 @@ auto CompilationUnitRef::file_offset(clang::SourceLocation location) -> std::uin
 }
 
 auto CompilationUnitRef::file_path(clang::FileID fid) -> llvm::StringRef {
-    assert(fid.isValid() && "Invalid fid");
+    if(!fid.isValid())
+        return {};
     if(auto it = self->path_cache.find(fid); it != self->path_cache.end()) {
         return it->second;
     }

src/compile/tidy.cpp

@@ -12,6 +12,10 @@
 #include "clang-tidy/ClangTidyDiagnosticConsumer.h"
 #include "clang-tidy/ClangTidyModuleRegistry.h"
 #include "clang-tidy/ClangTidyOptions.h"
+#ifdef CLICE_HAS_CLANG_TIDY_MODULES
+#define CLANG_TIDY_DISABLE_STATIC_ANALYZER_CHECKS
+#include "clang-tidy/ClangTidyForceLinker.h"
+#endif
 
 namespace clice::tidy {
 
@@ -92,15 +96,11 @@ tidy::ClangTidyOptions create_options() {
                          // include-cleaner is directly integrated in IncludeCleaner.cpp
                          "-misc-include-cleaner",
 
-                         // ----- False Positives -----
-
                          // Check relies on seeing ifndef/define/endif directives,
                          // clangd doesn't replay those when using a preamble.
                          "-llvm-header-guard",
                          "-modernize-macro-to-enum",
 
-                         // ----- Crashing Checks -----
-
                          // Check can choke on invalid (intermediate) c++
                          // code, which is often the case when clangd
                          // tries to build an AST.

src/feature/code_completion.cpp

@@ -296,7 +296,8 @@ public:
                            llvm::StringRef overload_key,
                            llvm::StringRef signature = {},
                            llvm::StringRef return_type = {},
-                           bool is_snippet = false) {
+                           bool is_snippet = false,
+                           bool is_deprecated = false) {
             if(label.empty()) {
                 return;
             }
@@ -327,6 +328,9 @@ public:
                         }
                         item.label_details = std::move(details);
                     }
+                    if(is_deprecated) {
+                        item.tags = std::vector{protocol::CompletionItemTag::Deprecated};
+                    }
                     overloads.push_back({
                         .item = std::move(item),
                         .score = *score,
@@ -355,6 +359,9 @@ public:
                 }
                 item.label_details = std::move(details);
             }
+            if(is_deprecated) {
+                item.tags = std::vector{protocol::CompletionItemTag::Deprecated};
+            }
             collected.push_back(std::move(item));
         };
 
@@ -431,13 +438,15 @@ public:
 
                     bool has_snippet = !snippet.empty();
                     auto insert = has_snippet ? llvm::StringRef(snippet) : llvm::StringRef(label);
+                    bool deprecated = candidate.Availability == CXAvailability_Deprecated;
                     try_add(label,
                             kind,
                             insert,
                             qualified_name.str(),
                             signature,
                             return_type,
-                            has_snippet);
+                            has_snippet,
+                            deprecated);
                     break;
                 }
             }

src/feature/document_symbols.cpp

@@ -93,18 +93,9 @@ auto symbol_detail(clang::ASTContext& context, const clang::NamedDecl& decl) ->
     return detail;
 }
 
-struct InternalSymbol {
-    std::string name;
-    std::string detail;
-    SymbolKind kind = SymbolKind::Invalid;
-    LocalSourceRange range;
-    LocalSourceRange selection_range;
-    std::vector<InternalSymbol> children;
-};
-
 struct SymbolFrame {
-    std::vector<InternalSymbol> symbols;
-    std::vector<InternalSymbol>* cursor = &symbols;
+    std::vector<DocumentSymbol> symbols;
+    std::vector<DocumentSymbol>* cursor = &symbols;
 };
 
 class DocumentSymbolCollector : public FilteredASTVisitor<DocumentSymbolCollector> {
@@ -143,7 +134,7 @@ public:
         return ok;
     }
 
-    auto collect() -> std::vector<InternalSymbol> {
+    auto collect() -> std::vector<DocumentSymbol> {
         TraverseDecl(unit.tu());
         return std::move(result.symbols);
     }
@@ -174,8 +165,8 @@ private:
     SymbolFrame result;
 };
 
-void sort_symbols(std::vector<InternalSymbol>& symbols) {
-    std::ranges::sort(symbols, [](const InternalSymbol& lhs, const InternalSymbol& rhs) {
+void sort_symbols(std::vector<DocumentSymbol>& symbols) {
+    std::ranges::sort(symbols, [](const DocumentSymbol& lhs, const DocumentSymbol& rhs) {
         if(lhs.range.begin != rhs.range.begin) {
             return lhs.range.begin < rhs.range.begin;
         }
@@ -187,7 +178,7 @@ void sort_symbols(std::vector<InternalSymbol>& symbols) {
     }
 }
 
-auto to_protocol_symbol(const InternalSymbol& symbol, const PositionMapper& converter)
+auto to_protocol_symbol(const DocumentSymbol& symbol, const PositionMapper& converter)
     -> protocol::DocumentSymbol {
     protocol::DocumentSymbol result{
         .name = symbol.name,
@@ -215,10 +206,15 @@ auto to_protocol_symbol(const InternalSymbol& symbol, const PositionMapper& conv
 
 }  // namespace
 
+auto document_symbols(CompilationUnitRef unit) -> std::vector<DocumentSymbol> {
+    auto result = DocumentSymbolCollector(unit).collect();
+    sort_symbols(result);
+    return result;
+}
+
 auto document_symbols(CompilationUnitRef unit, PositionEncoding encoding)
     -> std::vector<protocol::DocumentSymbol> {
-    auto internal = DocumentSymbolCollector(unit).collect();
-    sort_symbols(internal);
+    auto internal = document_symbols(unit);
 
     PositionMapper converter(unit.interested_content(), encoding);
     std::vector<protocol::DocumentSymbol> symbols;

src/feature/feature.h

@@ -7,6 +7,7 @@
 
 #include "compile/compilation.h"
 #include "compile/compilation_unit.h"
+#include "semantic/symbol_kind.h"
 
 #include "kota/ipc/lsp/position.h"
 #include "kota/ipc/lsp/protocol.h"
@@ -59,18 +60,66 @@ struct InlayHintsOptions {
 
 struct SignatureHelpOptions {};
 
-auto semantic_tokens(CompilationUnitRef unit, PositionEncoding encoding = PositionEncoding::UTF16)
+struct SemanticToken {
+    LocalSourceRange range;
+    SymbolKind kind = SymbolKind::Invalid;
+    std::uint32_t modifiers = 0;
+};
+
+struct FoldingRange {
+    LocalSourceRange range;
+    std::optional<protocol::FoldingRangeKind> kind;
+    std::string collapsed_text;
+};
+
+struct DocumentSymbol {
+    std::string name;
+    std::string detail;
+    SymbolKind kind = SymbolKind::Invalid;
+    LocalSourceRange range;
+    LocalSourceRange selection_range;
+    std::vector<DocumentSymbol> children;
+};
+
+enum class HintCategory : std::uint8_t {
+    Parameter,
+    DefaultArgument,
+    Type,
+    Designator,
+    BlockEnd,
+};
+
+struct InlayHint {
+    std::uint32_t offset = 0;
+    HintCategory kind = HintCategory::Type;
+    std::string label;
+    bool padding_left = false;
+    bool padding_right = false;
+};
+
+auto semantic_tokens(CompilationUnitRef unit) -> std::vector<SemanticToken>;
+auto semantic_tokens(CompilationUnitRef unit, PositionEncoding encoding)
     -> protocol::SemanticTokens;
 
+auto folding_ranges(CompilationUnitRef unit) -> std::vector<FoldingRange>;
+auto folding_ranges(CompilationUnitRef unit, PositionEncoding encoding)
+    -> std::vector<protocol::FoldingRange>;
+
+auto document_symbols(CompilationUnitRef unit) -> std::vector<DocumentSymbol>;
+auto document_symbols(CompilationUnitRef unit, PositionEncoding encoding)
+    -> std::vector<protocol::DocumentSymbol>;
+
+auto inlay_hints(CompilationUnitRef unit,
+                 LocalSourceRange target,
+                 const InlayHintsOptions& options = {}) -> std::vector<InlayHint>;
+auto inlay_hints(CompilationUnitRef unit,
+                 LocalSourceRange target,
+                 const InlayHintsOptions& options,
+                 PositionEncoding encoding) -> std::vector<protocol::InlayHint>;
+
 auto document_links(CompilationUnitRef unit, PositionEncoding encoding = PositionEncoding::UTF16)
     -> std::vector<protocol::DocumentLink>;
 
-auto document_symbols(CompilationUnitRef unit, PositionEncoding encoding = PositionEncoding::UTF16)
-    -> std::vector<protocol::DocumentSymbol>;
-
-auto folding_ranges(CompilationUnitRef unit, PositionEncoding encoding = PositionEncoding::UTF16)
-    -> std::vector<protocol::FoldingRange>;
-
 auto diagnostics(CompilationUnitRef unit, PositionEncoding encoding = PositionEncoding::UTF16)
     -> std::vector<protocol::Diagnostic>;
 
@@ -89,12 +138,6 @@ auto hover(CompilationUnitRef unit,
            const HoverOptions& options = {},
            PositionEncoding encoding = PositionEncoding::UTF16) -> std::optional<protocol::Hover>;
 
-auto inlay_hints(CompilationUnitRef unit,
-                 LocalSourceRange target,
-                 const InlayHintsOptions& options = {},
-                 PositionEncoding encoding = PositionEncoding::UTF16)
-    -> std::vector<protocol::InlayHint>;
-
 auto signature_help(CompilationParams& params, const SignatureHelpOptions& options = {})
     -> protocol::SignatureHelp;
 

src/feature/folding_ranges.cpp

@@ -53,12 +53,6 @@ auto to_kind(FoldingKind kind) -> protocol::FoldingRangeKind {
     return protocol::FoldingRangeKind(protocol::FoldingRangeKind::region);
 }
 
-struct RawFoldingRange {
-    LocalSourceRange range;
-    std::optional<protocol::FoldingRangeKind> kind;
-    std::string collapsed_text;
-};
-
 class FoldingRangeCollector : public FilteredASTVisitor<FoldingRangeCollector> {
 public:
     explicit FoldingRangeCollector(CompilationUnitRef unit) : FilteredASTVisitor(unit, true) {}
@@ -185,7 +179,7 @@ public:
         return true;
     }
 
-    auto collect() -> std::vector<RawFoldingRange> {
+    auto collect() -> std::vector<FoldingRange> {
         TraverseDecl(unit.tu());
 
         auto directives_it = unit.directives().find(unit.interested_file());
@@ -193,7 +187,7 @@ public:
             collect_directives(directives_it->second);
         }
 
-        std::ranges::sort(ranges, [](const RawFoldingRange& lhs, const RawFoldingRange& rhs) {
+        std::ranges::sort(ranges, [](const FoldingRange& lhs, const FoldingRange& rhs) {
             if(lhs.range.begin != rhs.range.begin) {
                 return lhs.range.begin < rhs.range.begin;
             }
@@ -343,14 +337,18 @@ private:
     }
 
 private:
-    std::vector<RawFoldingRange> ranges;
+    std::vector<FoldingRange> ranges;
 };
 
 }  // namespace
 
+auto folding_ranges(CompilationUnitRef unit) -> std::vector<FoldingRange> {
+    return FoldingRangeCollector(unit).collect();
+}
+
 auto folding_ranges(CompilationUnitRef unit, PositionEncoding encoding)
     -> std::vector<protocol::FoldingRange> {
-    auto collected = FoldingRangeCollector(unit).collect();
+    auto collected = folding_ranges(unit);
     PositionMapper converter(unit.interested_content(), encoding);
 
     std::vector<protocol::FoldingRange> result;

src/feature/formatting.cpp

@@ -49,7 +49,7 @@ auto document_format(llvm::StringRef file,
         range ? tooling::Range(range->begin, range->length()) : tooling::Range(0, content.size());
     auto replacements = format_content(file, content, selection);
     if(!replacements) {
-        LOG_INFO("Fail to format for {}\n{}", file, replacements.error());
+        LOG_WARN("Failed to format {}: {}", file, replacements.error());
         return edits;
     }
 

src/feature/inlay_hints.cpp

@@ -26,22 +26,6 @@ using llvm::dyn_cast_or_null;
 // For now, inlay hints are always anchored at the left or right of their range.
 enum class HintSide { Left, Right };
 
-enum class HintCategory : std::uint8_t {
-    Parameter,
-    DefaultArgument,
-    Type,
-    Designator,
-    BlockEnd,
-};
-
-struct RawInlayHint {
-    std::uint32_t offset = 0;
-    HintCategory kind = HintCategory::Type;
-    std::string label;
-    bool padding_left = false;
-    bool padding_right = false;
-};
-
 bool is_expanded_from_param_pack(const clang::ParmVarDecl* param) {
     return ast::underlying_pack_type(param) != nullptr;
 }
@@ -123,7 +107,7 @@ struct Callee {
 
 class Builder {
 public:
-    Builder(std::vector<RawInlayHint>& result,
+    Builder(std::vector<InlayHint>& result,
             CompilationUnitRef unit,
             LocalSourceRange restrict_range,
             const InlayHintsOptions& options) :
@@ -499,7 +483,7 @@ public:
         bool pad_left = prefix.consume_front(" ");
         bool pad_right = suffix.consume_back(" ");
 
-        RawInlayHint hint{
+        InlayHint hint{
             .offset = offset,
             .kind = kind,
             .label = (prefix + label + suffix).str(),
@@ -554,7 +538,7 @@ public:
     }
 
 private:
-    std::vector<RawInlayHint>& result;
+    std::vector<InlayHint>& result;
     CompilationUnitRef unit;
     LocalSourceRange restrict_range;
     const InlayHintsOptions& options;
@@ -913,36 +897,43 @@ private:
 
 }  // namespace
 
-auto inlay_hints(CompilationUnitRef unit,
-                 LocalSourceRange target,
-                 const InlayHintsOptions& options,
-                 PositionEncoding encoding) -> std::vector<protocol::InlayHint> {
+auto inlay_hints(CompilationUnitRef unit, LocalSourceRange target, const InlayHintsOptions& options)
+    -> std::vector<InlayHint> {
     if(!options.enabled) {
         return {};
     }
 
-    std::vector<RawInlayHint> raw_hints;
+    std::vector<InlayHint> raw_hints;
 
     Builder builder(raw_hints, unit, target, options);
     Visitor visitor(builder, unit, target, options);
     visitor.TraverseDecl(unit.tu());
 
-    std::ranges::sort(raw_hints, [](const RawInlayHint& lhs, const RawInlayHint& rhs) {
+    std::ranges::sort(raw_hints, [](const InlayHint& lhs, const InlayHint& rhs) {
         return std::tie(lhs.offset, lhs.label, lhs.kind, lhs.padding_left, lhs.padding_right) <
                std::tie(rhs.offset, rhs.label, rhs.kind, rhs.padding_left, rhs.padding_right);
     });
     auto unique_begin =
-        std::ranges::unique(raw_hints, [](const RawInlayHint& lhs, const RawInlayHint& rhs) {
+        std::ranges::unique(raw_hints, [](const InlayHint& lhs, const InlayHint& rhs) {
             return lhs.offset == rhs.offset && lhs.kind == rhs.kind && lhs.label == rhs.label &&
                    lhs.padding_left == rhs.padding_left && lhs.padding_right == rhs.padding_right;
         });
     raw_hints.erase(unique_begin.begin(), unique_begin.end());
 
+    return raw_hints;
+}
+
+auto inlay_hints(CompilationUnitRef unit,
+                 LocalSourceRange target,
+                 const InlayHintsOptions& options,
+                 PositionEncoding encoding) -> std::vector<protocol::InlayHint> {
+    auto collected = inlay_hints(unit, target, options);
+
     PositionMapper converter(unit.interested_content(), encoding);
     std::vector<protocol::InlayHint> hints;
-    hints.reserve(raw_hints.size());
+    hints.reserve(collected.size());
 
-    for(const auto& hint: raw_hints) {
+    for(const auto& hint: collected) {
         protocol::InlayHint out{
             .position = *converter.to_position(hint.offset),
             .label = hint.label,

src/feature/semantic_tokens.cpp

@@ -18,12 +18,6 @@ namespace clice::feature {
 
 namespace {
 
-struct RawToken {
-    LocalSourceRange range;
-    SymbolKind kind = SymbolKind::Invalid;
-    std::uint32_t modifiers = 0;
-};
-
 void add_modifier(std::uint32_t& modifiers, SymbolModifiers::Kind kind) {
     modifiers |= SymbolModifiers::to_mask(kind);
 }
@@ -40,6 +34,34 @@ bool is_dependent(const clang::Decl* D) {
     return isa<clang::UnresolvedUsingValueDecl>(D);
 }
 
+/// Whether a declaration name is backed by source text that should be highlighted.
+bool can_highlight_name(clang::DeclarationName name) {
+    switch(name.getNameKind()) {
+        case clang::DeclarationName::Identifier: {
+            auto* info = name.getAsIdentifierInfo();
+            return info && !info->getName().empty();
+        }
+
+        case clang::DeclarationName::CXXConstructorName:
+        case clang::DeclarationName::CXXDestructorName: {
+            return true;
+        }
+
+        case clang::DeclarationName::CXXConversionFunctionName:
+        case clang::DeclarationName::CXXOperatorName:
+        case clang::DeclarationName::CXXDeductionGuideName:
+        case clang::DeclarationName::CXXLiteralOperatorName:
+        case clang::DeclarationName::CXXUsingDirective:
+        case clang::DeclarationName::ObjCZeroArgSelector:
+        case clang::DeclarationName::ObjCOneArgSelector:
+        case clang::DeclarationName::ObjCMultiArgSelector: {
+            return false;
+        }
+    }
+
+    std::unreachable();
+}
+
 /// Returns true if `decl` is considered to be from a default/system library.
 /// This currently checks the systemness of the file by include type, although
 /// different heuristics may be used in the future (e.g. sysroot paths).
@@ -166,7 +188,7 @@ class SemanticTokensCollector : public SemanticVisitor<SemanticTokensCollector>
 public:
     explicit SemanticTokensCollector(CompilationUnitRef unit) : SemanticVisitor(unit, true) {}
 
-    auto collect() -> std::vector<RawToken> {
+    auto collect() -> std::vector<SemanticToken> {
         highlight_lexical(unit.interested_file());
         run();
         highlight_modules();
@@ -177,6 +199,10 @@ public:
     void handleDeclOccurrence(const clang::NamedDecl* decl,
                               RelationKind relation,
                               clang::SourceLocation location) {
+        if(relation.isReference() && !can_highlight_name(decl->getDeclName())) {
+            return;
+        }
+
         std::uint32_t modifiers = 0;
         if(relation.is_one_of(RelationKind::Definition)) {
             // todo: clangd add both Declaration and Definition modifiers for definitions.
@@ -398,7 +424,7 @@ private:
         }
     }
 
-    static void resolve_conflict(RawToken& last, const RawToken& current) {
+    static void resolve_conflict(SemanticToken& last, const SemanticToken& current) {
         if(last.kind == SymbolKind::Conflict) {
             return;
         }
@@ -414,14 +440,14 @@ private:
     }
 
     void merge_tokens() {
-        std::ranges::sort(tokens, [](const RawToken& lhs, const RawToken& rhs) {
+        std::ranges::sort(tokens, [](const SemanticToken& lhs, const SemanticToken& rhs) {
             if(lhs.range.begin != rhs.range.begin) {
                 return lhs.range.begin < rhs.range.begin;
             }
             return lhs.range.end < rhs.range.end;
         });
 
-        std::vector<RawToken> merged;
+        std::vector<SemanticToken> merged;
         merged.reserve(tokens.size());
 
         for(const auto& token: tokens) {
@@ -448,7 +474,7 @@ private:
     }
 
 public:
-    std::vector<RawToken> tokens;
+    std::vector<SemanticToken> tokens;
 };
 
 class SemanticTokenEncoder {
@@ -458,7 +484,7 @@ public:
                          protocol::SemanticTokens& output) :
         content(content), converter(content, encoding), output(output) {}
 
-    void append(const RawToken& token) {
+    void append(const SemanticToken& token) {
         if(!token.range.valid() || token.range.end <= token.range.begin ||
            token.range.end > content.size()) {
             return;
@@ -542,10 +568,14 @@ private:
 
 }  // namespace
 
+auto semantic_tokens(CompilationUnitRef unit) -> std::vector<SemanticToken> {
+    SemanticTokensCollector collector(unit);
+    return collector.collect();
+}
+
 auto semantic_tokens(CompilationUnitRef unit, PositionEncoding encoding)
     -> protocol::SemanticTokens {
-    SemanticTokensCollector collector(unit);
-    auto tokens = collector.collect();
+    auto tokens = semantic_tokens(unit);
 
     protocol::SemanticTokens result;
     result.data.reserve(tokens.size() * 5);

src/semantic/ast_utility.cpp

@@ -308,6 +308,10 @@ const clang::NamedDecl* decl_of_impl(const void* T) {
 }
 
 auto decl_of(clang::QualType type) -> const clang::NamedDecl* {
+    if(type.isNull()) {
+        return nullptr;
+    }
+
     // Strip type-sugar that wraps the underlying type without adding a decl
     // (e.g. ElaboratedType for "struct Foo" vs plain "Foo").
     if(auto ET = type->getAs<clang::ElaboratedType>()) {

src/semantic/resolver.cpp

@@ -1111,8 +1111,6 @@ public:
         return Base::TransformDecltypeType(TLB, TL);
     }
 
-    // --- State ---
-
 private:
     clang::Sema& sema;
     clang::ASTContext& context;

src/server/compiler/compile_graph.cpp

@@ -1,4 +1,4 @@
-#include "server/compile_graph.h"
+#include "server/compiler/compile_graph.h"
 
 #include <algorithm>
 

src/server/compiler/compiler.cpp

@@ -1,4 +1,4 @@
-#include "server/compiler.h"
+#include "server/compiler/compiler.h"
 
 #include <format>
 #include <ranges>
@@ -6,7 +6,7 @@
 
 #include "command/search_config.h"
 #include "index/tu_index.h"
-#include "server/protocol.h"
+#include "server/protocol/worker.h"
 #include "support/filesystem.h"
 #include "support/logging.h"
 #include "syntax/include_resolver.h"
@@ -28,16 +28,20 @@ using serde_raw = kota::codec::RawValue;
 /// Detect whether the cursor is inside a preamble directive (include/import).
 
 Compiler::Compiler(kota::event_loop& loop,
-                   kota::ipc::JsonPeer& peer,
                    Workspace& workspace,
                    WorkerPool& pool,
                    llvm::DenseMap<std::uint32_t, Session>& sessions) :
-    loop(loop), peer(peer), workspace(workspace), pool(pool), sessions(sessions) {}
+    loop(loop), workspace(workspace), pool(pool), sessions(sessions) {}
 
 Compiler::~Compiler() {
     workspace.cancel_all();
 }
 
+kota::task<> Compiler::stop() {
+    compile_tasks.cancel();
+    co_await compile_tasks.join();
+}
+
 void Compiler::init_compile_graph() {
     if(workspace.path_to_module.empty()) {
         LOG_INFO("No C++20 modules detected, skipping CompileGraph");
@@ -47,8 +51,13 @@ void Compiler::init_compile_graph() {
     // Lazy dependency resolver: scans a module file on demand to discover imports.
     auto resolve = [this](std::uint32_t path_id) -> llvm::SmallVector<std::uint32_t> {
         auto file_path = workspace.path_pool.resolve(path_id);
-        auto results =
-            workspace.cdb.lookup(file_path, {.query_toolchain = true, .suppress_logging = true});
+        std::vector<std::string> rule_append, rule_remove;
+        workspace.config.match_rules(file_path, rule_append, rule_remove);
+        auto results = workspace.cdb.lookup(file_path,
+                                            {.query_toolchain = true,
+                                             .suppress_logging = true,
+                                             .remove = rule_remove,
+                                             .append = rule_append});
         if(results.empty())
             return {};
 
@@ -97,7 +106,8 @@ void Compiler::init_compile_graph() {
         }
         auto args_hash = llvm::xxh3_64bits(llvm::StringRef(hash_input));
         auto pcm_filename = std::format("{}-{:016x}.pcm", safe_module_name, args_hash);
-        auto pcm_path = path::join(workspace.config.cache_dir, "cache", "pcm", pcm_filename);
+        auto pcm_path =
+            path::join(workspace.config.project.cache_dir, "cache", "pcm", pcm_filename);
 
         // Check if cached PCM is still valid.
         if(auto pcm_it = workspace.pcm_cache.find(path_id); pcm_it != workspace.pcm_cache.end()) {
@@ -156,7 +166,11 @@ bool Compiler::fill_compile_args(llvm::StringRef path,
     }
 
     // 2. Normal CDB lookup for the file itself.
-    auto results = workspace.cdb.lookup(path, {.query_toolchain = true});
+    //    Apply rules from config (append/remove flags based on file patterns).
+    std::vector<std::string> rule_append, rule_remove;
+    workspace.config.match_rules(path, rule_append, rule_remove);
+    CommandOptions opts{.query_toolchain = true, .remove = rule_remove, .append = rule_append};
+    auto results = workspace.cdb.lookup(path, opts);
     if(!results.empty()) {
         auto& cmd = results.front();
         directory = cmd.resolved.directory.str();
@@ -205,7 +219,13 @@ bool Compiler::fill_header_context_args(llvm::StringRef path,
     }
 
     auto host_path = workspace.path_pool.resolve(ctx_ptr->host_path_id);
-    auto host_results = workspace.cdb.lookup(host_path, {.query_toolchain = true});
+    // Apply rules matching the HEADER path (what the user is editing) on top of
+    // the host's command — rules are expected to apply uniformly to every file.
+    std::vector<std::string> rule_append, rule_remove;
+    workspace.config.match_rules(path, rule_append, rule_remove);
+    auto host_results = workspace.cdb.lookup(
+        host_path,
+        {.query_toolchain = true, .remove = rule_remove, .append = rule_append});
     if(host_results.empty()) {
         LOG_WARN("fill_header_context_args: host {} has no CDB entry", host_path);
         return false;
@@ -355,7 +375,7 @@ std::optional<HeaderFileContext> Compiler::resolve_header_context(std::uint32_t
     // Hash the preamble and write to cache directory.
     auto preamble_hash = llvm::xxh3_64bits(llvm::StringRef(preamble));
     auto preamble_filename = std::format("{:016x}.h", preamble_hash);
-    auto preamble_dir = path::join(workspace.config.cache_dir, "header_context");
+    auto preamble_dir = path::join(workspace.config.project.cache_dir, "header_context");
     auto preamble_path = path::join(preamble_dir, preamble_filename);
 
     if(!llvm::sys::fs::exists(preamble_path)) {
@@ -394,6 +414,8 @@ std::string uri_to_path(const std::string& uri) {
 void Compiler::publish_diagnostics(const std::string& uri,
                                    int version,
                                    const kota::codec::RawValue& diagnostics_json) {
+    if(!peer)
+        return;
     std::vector<protocol::Diagnostic> diagnostics;
     if(!diagnostics_json.empty()) {
         auto status = kota::codec::json::from_json(diagnostics_json.data, diagnostics);
@@ -405,14 +427,16 @@ void Compiler::publish_diagnostics(const std::string& uri,
     params.uri = uri;
     params.version = version;
     params.diagnostics = std::move(diagnostics);
-    peer.send_notification(params);
+    peer->send_notification(params);
 }
 
 void Compiler::clear_diagnostics(const std::string& uri) {
+    if(!peer)
+        return;
     protocol::PublishDiagnosticsParams params;
     params.uri = uri;
     params.diagnostics = {};
-    peer.send_notification(params);
+    peer->send_notification(params);
 }
 
 kota::task<bool> Compiler::ensure_pch(Session& session,
@@ -438,7 +462,7 @@ kota::task<bool> Compiler::ensure_pch(Session& session,
     auto preamble_hash = llvm::xxh3_64bits(preamble_text);
 
     // Deterministic content-addressed PCH path.
-    auto pch_path = path::join(workspace.config.cache_dir,
+    auto pch_path = path::join(workspace.config.project.cache_dir,
                                "cache",
                                "pch",
                                std::format("{:016x}.pch", preamble_hash));
@@ -474,6 +498,22 @@ kota::task<bool> Compiler::ensure_pch(Session& session,
     auto completion = std::make_shared<kota::event>();
     workspace.pch_cache[path_id].building = completion;
 
+    if(workspace.config.project.cache_dir.empty()) {
+        LOG_WARN("PCH build skipped: cache_dir is not configured");
+        workspace.pch_cache[path_id].building.reset();
+        completion->set();
+        co_return false;
+    }
+
+    // Ensure the PCH cache directory exists.
+    auto pch_dir = path::join(workspace.config.project.cache_dir, "cache", "pch");
+    if(auto ec = llvm::sys::fs::create_directories(pch_dir)) {
+        LOG_WARN("Cannot create PCH cache dir {}: {}", pch_dir, ec.message());
+        workspace.pch_cache[path_id].building.reset();
+        completion->set();
+        co_return false;
+    }
+
     // Build a new PCH via stateless worker.
     worker::BuildParams bp;
     bp.kind = worker::BuildKind::BuildPCH;
@@ -597,6 +637,102 @@ void Compiler::record_deps(Session& session, llvm::ArrayRef<std::string> deps) {
 /// Called lazily by forward_query() / forward_build() before every
 /// feature request (hover, semantic tokens, etc.). Guarantees that when it
 /// returns true the stateful worker assigned to `path_id` holds an up-to-date
+kota::task<> Compiler::run_compile(std::uint32_t pid, std::shared_ptr<Session::PendingCompile> pc) {
+    auto find_session = [&]() -> Session* {
+        auto it = sessions.find(pid);
+        return it != sessions.end() ? &it->second : nullptr;
+    };
+
+    auto* sess = find_session();
+    if(!sess) {
+        pc->done.set();
+        co_return;
+    }
+
+    auto finish_compile = [&]() {
+        auto* s = find_session();
+        if(s && s->compiling == pc) {
+            s->compiling.reset();
+        }
+        LOG_INFO("ensure_compiled: finish path_id={}", pid);
+        pc->done.set();
+    };
+
+    auto gen = sess->generation;
+    LOG_INFO("ensure_compiled: starting compile path_id={} gen={}", pid, gen);
+
+    auto file_path = std::string(workspace.path_pool.resolve(pid));
+    auto uri = lsp::URI::from_file_path(file_path);
+    std::string uri_str = uri.has_value() ? uri->str() : file_path;
+
+    worker::CompileParams params;
+    params.path = file_path;
+    params.version = sess->version;
+    params.text = sess->text;
+    params.clang_tidy = workspace.config.project.clang_tidy.value;
+    if(!fill_compile_args(file_path, params.directory, params.arguments, sess)) {
+        finish_compile();
+        co_return;
+    }
+
+    if(!co_await ensure_deps(*sess, params.directory, params.arguments, params.pch, params.pcms)) {
+        LOG_WARN("Dependency preparation failed for {}, skipping compile", uri_str);
+        finish_compile();
+        co_return;
+    }
+
+    sess = find_session();
+    if(!sess) {
+        pc->done.set();
+        co_return;
+    }
+
+    auto result = co_await pool.send_stateful(pid, params);
+
+    sess = find_session();
+    if(!sess) {
+        pc->done.set();
+        co_return;
+    }
+
+    if(sess->generation != gen) {
+        LOG_INFO("ensure_compiled: generation mismatch ({} vs {}) for {}",
+                 sess->generation,
+                 gen,
+                 uri_str);
+        finish_compile();
+        co_return;
+    }
+
+    if(!result.has_value()) {
+        LOG_WARN("Compile failed for {}: {}", uri_str, result.error().message);
+        clear_diagnostics(uri_str);
+        finish_compile();
+        co_return;
+    }
+
+    sess->ast_dirty = false;
+    pc->succeeded = true;
+    record_deps(*sess, result.value().deps);
+
+    if(!result.value().tu_index_data.empty()) {
+        auto tu_index = index::TUIndex::from(result.value().tu_index_data.data());
+        OpenFileIndex ofi;
+        ofi.file_index = std::move(tu_index.main_file_index);
+        ofi.symbols = std::move(tu_index.symbols);
+        ofi.content = sess->text;
+        ofi.mapper.emplace(ofi.content, lsp::PositionEncoding::UTF16);
+        sess->file_index = std::move(ofi);
+    }
+
+    auto version = sess->version;
+    finish_compile();
+
+    publish_diagnostics(uri_str, version, result.value().diagnostics);
+    if(on_indexing_needed)
+        on_indexing_needed();
+}
+
 /// AST and diagnostics have been published to the client.
 ///
 /// Lifecycle overview (pull-based model):
@@ -616,9 +752,9 @@ void Compiler::record_deps(Session& session, llvm::ArrayRef<std::string> deps) {
 /// worker); every other file is read from disk by the compiler.
 ///
 /// Concurrency: multiple concurrent feature requests for the same file will
-/// each call ensure_compiled(). The first one launches a detached compile
-/// task via loop.schedule(); subsequent ones wait on the shared event.
-/// The detached task cannot be cancelled by LSP $/cancelRequest, preventing
+/// each call ensure_compiled(). The first one spawns a compile task into the
+/// Compiler's task_group; subsequent ones wait on the shared event.
+/// The spawned task is not cancelled by LSP $/cancelRequest, preventing
 /// the race where cancellation wakes all waiters and they all start compiles.
 kota::task<bool> Compiler::ensure_compiled(Session& session) {
     auto path_id = session.path_id;
@@ -647,124 +783,12 @@ kota::task<bool> Compiler::ensure_compiled(Session& session) {
             co_return true;
     }
 
-    // No compile in flight and AST is dirty — launch a detached compile task.
-    // The detached task is scheduled via loop.schedule() so it is NOT subject
-    // to LSP $/cancelRequest cancellation.  This eliminates the race where
-    // cancellation fires the RAII guard, waking all waiters simultaneously
-    // and causing them all to start new compiles.
     auto pending_compile = std::make_shared<Session::PendingCompile>();
     session.compiling = pending_compile;
 
-    LOG_INFO("ensure_compiled: launching detached compile path_id={} gen={}",
-             path_id,
-             session.generation);
+    LOG_INFO("ensure_compiled: launching compile path_id={} gen={}", path_id, session.generation);
 
-    // Capture path_id by value so the detached lambda can re-lookup the session
-    // from the sessions map after co_await (DenseMap may invalidate pointers).
-    loop.schedule([](Compiler* self,
-                     std::uint32_t pid,
-                     std::shared_ptr<Session::PendingCompile> pc) -> kota::task<> {
-        // Re-lookup session from the sessions map (pointer may have been
-        // invalidated by DenseMap growth during co_await).
-        auto find_session = [&]() -> Session* {
-            auto it = self->sessions.find(pid);
-            return it != self->sessions.end() ? &it->second : nullptr;
-        };
-
-        auto* sess = find_session();
-        if(!sess) {
-            pc->done.set();
-            co_return;
-        }
-
-        auto finish_compile = [&]() {
-            auto* s = find_session();
-            if(s && s->compiling == pc) {
-                s->compiling.reset();
-            }
-            LOG_INFO("ensure_compiled: finish_compile (detached) path_id={}", pid);
-            pc->done.set();
-        };
-
-        auto gen = sess->generation;
-        LOG_INFO("ensure_compiled: starting compile (detached) path_id={} gen={}", pid, gen);
-
-        auto file_path = std::string(self->workspace.path_pool.resolve(pid));
-        auto uri = lsp::URI::from_file_path(file_path);
-        std::string uri_str = uri.has_value() ? uri->str() : file_path;
-
-        worker::CompileParams params;
-        params.path = file_path;
-        params.version = sess->version;
-        params.text = sess->text;
-        if(!self->fill_compile_args(file_path, params.directory, params.arguments, sess)) {
-            finish_compile();
-            co_return;
-        }
-
-        if(!co_await self
-                ->ensure_deps(*sess, params.directory, params.arguments, params.pch, params.pcms)) {
-            LOG_WARN("Dependency preparation failed for {}, skipping compile", uri_str);
-            finish_compile();
-            co_return;
-        }
-
-        // Re-lookup after co_await (DenseMap may have grown).
-        sess = find_session();
-        if(!sess) {
-            pc->done.set();
-            co_return;
-        }
-
-        auto result = co_await self->pool.send_stateful(pid, params);
-
-        // Re-lookup after co_await.
-        sess = find_session();
-        if(!sess) {
-            pc->done.set();
-            co_return;
-        }
-
-        if(sess->generation != gen) {
-            LOG_INFO("ensure_compiled: generation mismatch ({} vs {}) for {}",
-                     sess->generation,
-                     gen,
-                     uri_str);
-            finish_compile();
-            co_return;
-        }
-
-        if(!result.has_value()) {
-            LOG_WARN("Compile failed for {}: {}", uri_str, result.error().message);
-            self->clear_diagnostics(uri_str);
-            finish_compile();
-            co_return;
-        }
-
-        sess->ast_dirty = false;
-        pc->succeeded = true;
-        self->record_deps(*sess, result.value().deps);
-
-        // Store open file index from the stateful worker's TUIndex.
-        if(!result.value().tu_index_data.empty()) {
-            auto tu_index = index::TUIndex::from(result.value().tu_index_data.data());
-            OpenFileIndex ofi;
-            ofi.file_index = std::move(tu_index.main_file_index);
-            ofi.symbols = std::move(tu_index.symbols);
-            ofi.content = sess->text;
-            ofi.mapper.emplace(ofi.content, lsp::PositionEncoding::UTF16);
-            sess->file_index = std::move(ofi);
-        }
-
-        auto version = sess->version;
-        finish_compile();
-
-        // Publish diagnostics AFTER marking compile as done, so that concurrent
-        // forward_query() calls can proceed immediately.
-        self->publish_diagnostics(uri_str, version, result.value().diagnostics);
-        if(self->on_indexing_needed)
-            self->on_indexing_needed();
-    }(this, path_id, pending_compile));
+    compile_tasks.spawn(run_compile(path_id, pending_compile));
 
     // Wait for the detached compile to finish.  If this wait is cancelled
     // by LSP $/cancelRequest, the detached task continues unaffected.
@@ -859,6 +883,32 @@ Compiler::RawResult Compiler::forward_build(worker::BuildKind kind,
     co_return std::move(result.value().result_json);
 }
 
+Compiler::RawResult Compiler::forward_format(Session& session,
+                                             std::optional<protocol::Range> range) {
+    auto path_id = session.path_id;
+    auto path = std::string(workspace.path_pool.resolve(path_id));
+
+    worker::BuildParams wp;
+    wp.kind = worker::BuildKind::Format;
+    wp.file = path;
+    wp.text = session.text;
+
+    if(range) {
+        lsp::PositionMapper mapper(wp.text, lsp::PositionEncoding::UTF16);
+        auto begin = mapper.to_offset(range->start);
+        auto end = mapper.to_offset(range->end);
+        if(!begin || !end)
+            co_return serde_raw{"null"};
+        wp.format_range = {*begin, *end};
+    }
+
+    auto result = co_await pool.send_stateless(wp);
+    if(!result.has_value()) {
+        co_return serde_raw{"null"};
+    }
+    co_return std::move(result.value().result_json);
+}
+
 Compiler::RawResult Compiler::handle_completion(const protocol::Position& position,
                                                 Session& session) {
     auto path_id = session.path_id;

src/server/compiler/compiler.h

@@ -8,13 +8,13 @@
 #include <vector>
 
 #include "command/command.h"
-#include "server/session.h"
-#include "server/worker_pool.h"
-#include "server/workspace.h"
+#include "server/service/session.h"
+#include "server/worker/worker_pool.h"
+#include "server/workspace/workspace.h"
 #include "syntax/completion.h"
 
 #include "kota/async/async.h"
-#include "kota/codec/raw_value.h"
+#include "kota/codec/json/json.h"
 #include "kota/ipc/codec/json.h"
 #include "kota/ipc/lsp/protocol.h"
 #include "kota/ipc/peer.h"
@@ -50,10 +50,14 @@ std::string uri_to_path(const std::string& uri);
 class Compiler {
 public:
     Compiler(kota::event_loop& loop,
-             kota::ipc::JsonPeer& peer,
              Workspace& workspace,
              WorkerPool& pool,
              llvm::DenseMap<std::uint32_t, Session>& sessions);
+
+    void set_peer(kota::ipc::JsonPeer* p) {
+        peer = p;
+    }
+
     ~Compiler();
 
     void init_compile_graph();
@@ -86,6 +90,9 @@ public:
                             const protocol::Position& position,
                             Session& session);
 
+    /// Forward a formatting request to a stateless worker.
+    RawResult forward_format(Session& session, std::optional<protocol::Range> range = {});
+
     /// Handle completion requests.  Detects preamble context (include/import)
     /// and serves those locally; delegates code completion to a stateless worker.
     RawResult handle_completion(const protocol::Position& position, Session& session);
@@ -96,7 +103,12 @@ public:
     /// Callback invoked when indexing should be scheduled.
     std::function<void()> on_indexing_needed;
 
+    /// Cancel in-flight compile tasks and wait for them to finish.
+    kota::task<> stop();
+
 private:
+    kota::task<> run_compile(std::uint32_t path_id, std::shared_ptr<Session::PendingCompile> pc);
+
     kota::task<bool> ensure_deps(Session& session,
                                  const std::string& directory,
                                  const std::vector<std::string>& arguments,
@@ -125,10 +137,11 @@ private:
 
 private:
     kota::event_loop& loop;
-    kota::ipc::JsonPeer& peer;
+    kota::ipc::JsonPeer* peer = nullptr;
     Workspace& workspace;
     WorkerPool& pool;
     llvm::DenseMap<std::uint32_t, Session>& sessions;
+    kota::task_group<> compile_tasks{loop};
 };
 
 }  // namespace clice

src/server/compiler/indexer.cpp

@@ -1,14 +1,15 @@
-#include "server/indexer.h"
+#include "server/compiler/indexer.h"
 
+#include <algorithm>
 #include <string>
 #include <variant>
 #include <vector>
 
 #include "index/tu_index.h"
-#include "server/compiler.h"
-#include "server/protocol.h"
-#include "server/session.h"
-#include "server/worker_pool.h"
+#include "server/compiler/compiler.h"
+#include "server/protocol/worker.h"
+#include "server/service/session.h"
+#include "server/worker/worker_pool.h"
 #include "support/filesystem.h"
 #include "support/logging.h"
 
@@ -446,6 +447,152 @@ std::optional<SymbolInfo> Indexer::resolve_symbol(index::SymbolHash hash) {
     return SymbolInfo{hash, std::move(name), kind, def_loc->uri, def_loc->range};
 }
 
+static std::string extract_line(llvm::StringRef content, std::uint32_t offset) {
+    if(content.empty() || offset >= content.size())
+        return {};
+    std::size_t line_start = 0;
+    if(offset > 0) {
+        auto pos = content.rfind('\n', offset - 1);
+        if(pos != llvm::StringRef::npos)
+            line_start = pos + 1;
+    }
+    auto line_end = content.find('\n', offset);
+    if(line_end == llvm::StringRef::npos)
+        line_end = content.size();
+    return content.slice(line_start, line_end).str();
+}
+
+std::optional<Indexer::DefinitionText> Indexer::get_definition_text(index::SymbolHash hash) {
+    for(auto& [id, sess]: sessions) {
+        if(!sess.file_index || !sess.file_index->mapper)
+            continue;
+        auto it = sess.file_index->file_index.relations.find(hash);
+        if(it == sess.file_index->file_index.relations.end())
+            continue;
+        for(auto& rel: it->second) {
+            if(rel.kind.value() != RelationKind::Definition)
+                continue;
+            auto def_range = std::bit_cast<LocalSourceRange>(rel.target_symbol);
+            if(def_range.begin >= def_range.end)
+                continue;
+            llvm::StringRef content = sess.file_index->content;
+            if(def_range.end > content.size())
+                continue;
+            auto start = sess.file_index->mapper->to_position(def_range.begin);
+            auto end = sess.file_index->mapper->to_position(def_range.end);
+            if(!start || !end)
+                continue;
+            return DefinitionText{
+                .file = std::string(workspace.path_pool.resolve(id)),
+                .start_line = static_cast<int>(start->line) + 1,
+                .end_line = static_cast<int>(end->line) + 1,
+                .text =
+                    std::string(content.substr(def_range.begin, def_range.end - def_range.begin)),
+            };
+        }
+    }
+
+    auto sym_it = workspace.project_index.symbols.find(hash);
+    if(sym_it == workspace.project_index.symbols.end())
+        return std::nullopt;
+
+    for(auto file_id: sym_it->second.reference_files) {
+        if(is_proj_path_open(file_id))
+            continue;
+        auto shard_it = workspace.merged_indices.find(file_id);
+        if(shard_it == workspace.merged_indices.end())
+            continue;
+        auto* m = shard_it->second.mapper();
+        if(!m)
+            continue;
+        auto content = shard_it->second.index.content();
+
+        std::optional<DefinitionText> result;
+        shard_it->second.index.lookup(
+            hash,
+            RelationKind::Definition,
+            [&](const index::Relation& r) {
+                auto def_range = std::bit_cast<LocalSourceRange>(r.target_symbol);
+                if(def_range.begin >= def_range.end || def_range.end > content.size())
+                    return true;
+                auto start = m->to_position(def_range.begin);
+                auto end = m->to_position(def_range.end);
+                if(!start || !end)
+                    return true;
+                result = DefinitionText{
+                    .file = workspace.project_index.path_pool.path(file_id).str(),
+                    .start_line = static_cast<int>(start->line) + 1,
+                    .end_line = static_cast<int>(end->line) + 1,
+                    .text = std::string(
+                        content.substr(def_range.begin, def_range.end - def_range.begin)),
+                };
+                return false;
+            });
+        if(result)
+            return result;
+    }
+
+    return std::nullopt;
+}
+
+std::vector<Indexer::ReferenceWithContext> Indexer::collect_references(index::SymbolHash hash,
+                                                                       RelationKind kind) {
+    std::vector<ReferenceWithContext> results;
+
+    auto sym_it = workspace.project_index.symbols.find(hash);
+    if(sym_it != workspace.project_index.symbols.end()) {
+        for(auto file_id: sym_it->second.reference_files) {
+            if(is_proj_path_open(file_id))
+                continue;
+            auto shard_it = workspace.merged_indices.find(file_id);
+            if(shard_it == workspace.merged_indices.end())
+                continue;
+            auto* m = shard_it->second.mapper();
+            if(!m)
+                continue;
+            auto content = shard_it->second.index.content();
+            auto file_path = workspace.project_index.path_pool.path(file_id);
+
+            shard_it->second.index.lookup(hash, kind, [&](const index::Relation& r) {
+                auto start = m->to_position(r.range.begin);
+                if(!start)
+                    return true;
+                results.push_back(ReferenceWithContext{
+                    .file = file_path.str(),
+                    .line = static_cast<int>(start->line) + 1,
+                    .context = extract_line(content, r.range.begin),
+                });
+                return true;
+            });
+        }
+    }
+
+    for(auto& [id, sess]: sessions) {
+        if(!sess.file_index || !sess.file_index->mapper)
+            continue;
+        auto it = sess.file_index->file_index.relations.find(hash);
+        if(it == sess.file_index->file_index.relations.end())
+            continue;
+        auto file_path = workspace.path_pool.resolve(id);
+        llvm::StringRef content = sess.file_index->content;
+
+        for(auto& rel: it->second) {
+            if(rel.kind != kind)
+                continue;
+            auto start = sess.file_index->mapper->to_position(rel.range.begin);
+            if(!start)
+                continue;
+            results.push_back(ReferenceWithContext{
+                .file = file_path.str(),
+                .line = static_cast<int>(start->line) + 1,
+                .context = extract_line(content, rel.range.begin),
+            });
+        }
+    }
+
+    return results;
+}
+
 std::vector<protocol::CallHierarchyIncomingCall>
     Indexer::find_incoming_calls(index::SymbolHash hash) {
     llvm::DenseMap<index::SymbolHash, std::vector<protocol::Range>> caller_ranges;
@@ -624,16 +771,108 @@ void Indexer::enqueue(std::uint32_t server_path_id) {
     index_queue.push_back(server_path_id);
 }
 
+void Indexer::pause_indexing() {
+    ++pause_depth;
+    if(pause_depth == 1) {
+        resume_event.reset();
+        LOG_DEBUG("Background indexing paused");
+    }
+}
+
+void Indexer::resume_indexing() {
+    if(pause_depth > 0)
+        --pause_depth;
+    if(pause_depth == 0) {
+        resume_event.set();
+        LOG_DEBUG("Background indexing resumed");
+    }
+}
+
+kota::task<> Indexer::stop() {
+    bg_tasks.cancel();
+    co_await bg_tasks.join();
+}
+
 void Indexer::schedule() {
-    if(!workspace.config.enable_indexing || indexing_active || indexing_scheduled)
+    if(!*workspace.config.project.enable_indexing || indexing_active || indexing_scheduled)
         return;
     indexing_scheduled = true;
 
     if(!index_idle_timer) {
         index_idle_timer = std::make_shared<kota::timer>(kota::timer::create(loop));
     }
-    index_idle_timer->start(std::chrono::milliseconds(workspace.config.idle_timeout_ms));
-    loop.schedule(run_background_indexing());
+    index_idle_timer->start(std::chrono::milliseconds(*workspace.config.project.idle_timeout_ms));
+
+    if(!bg_tasks.spawn(run_background_indexing())) {
+        indexing_scheduled = false;
+        LOG_WARN("Failed to spawn background indexing task (task group stopped)");
+    }
+}
+
+kota::task<> Indexer::index_one(std::uint32_t server_path_id) {
+    auto file_path = std::string(workspace.path_pool.resolve(server_path_id));
+
+    if(sessions.contains(server_path_id))
+        co_return;
+
+    if(!need_update(file_path))
+        co_return;
+
+    // For module interface units, compile their PCM (and transitive deps)
+    // first so the stateless worker has the artifacts it needs.
+    if(workspace.compile_graph && workspace.path_to_module.contains(server_path_id)) {
+        co_await workspace.compile_graph->compile(server_path_id);
+    }
+
+    worker::BuildParams params;
+    params.kind = worker::BuildKind::Index;
+    params.file = file_path;
+    if(!compiler.fill_compile_args(file_path, params.directory, params.arguments, nullptr))
+        co_return;
+
+    workspace.fill_pcm_deps(params.pcms);
+
+    LOG_INFO("Background indexing: {}", file_path);
+
+    auto result = co_await pool.send_stateless(params);
+    if(result.has_value() && result.value().success && !result.value().tu_index_data.empty()) {
+        LOG_INFO("Background indexing got TUIndex for {}: {} bytes",
+                 file_path,
+                 result.value().tu_index_data.size());
+        merge(result.value().tu_index_data.data(), result.value().tu_index_data.size());
+    } else if(result.has_value() && !result.value().success) {
+        LOG_WARN("Background index failed for {}: {}", file_path, result.value().error);
+    } else if(result.has_value() && result.value().tu_index_data.empty()) {
+        LOG_WARN("Background index returned empty TUIndex for {}", file_path);
+    } else {
+        LOG_WARN("Background index IPC error for {}: {}", file_path, result.error().message);
+    }
+}
+
+kota::task<> Indexer::monitor_resources() {
+    while(true) {
+        co_await kota::sleep(std::chrono::milliseconds(3000));
+
+        auto mem = kota::sys::memory();
+        if(mem.total == 0)
+            continue;
+
+        auto effective_total =
+            (mem.constrained > 0 && mem.constrained < mem.total) ? mem.constrained : mem.total;
+        auto ratio = static_cast<double>(mem.available) / static_cast<double>(effective_total);
+
+        if(ratio < 0.15 && max_concurrent > 1) {
+            --max_concurrent;
+            LOG_INFO("Index concurrency -> {} (memory pressure: {:.0f}% available)",
+                     max_concurrent,
+                     ratio * 100);
+        } else if(ratio > 0.30 && max_concurrent < baseline_concurrent) {
+            ++max_concurrent;
+            LOG_DEBUG("Index concurrency -> {} (memory OK: {:.0f}% available)",
+                      max_concurrent,
+                      ratio * 100);
+        }
+    }
 }
 
 kota::task<> Indexer::run_background_indexing() {
@@ -648,49 +887,75 @@ kota::task<> Indexer::run_background_indexing() {
     }
 
     indexing_active = true;
-    std::size_t processed = 0;
 
-    while(index_queue_pos < index_queue.size()) {
-        auto server_path_id = index_queue[index_queue_pos];
-        index_queue_pos++;
+    kota::cancellation_source monitor_cancel;
+    bg_tasks.spawn(kota::with_token(monitor_resources(), monitor_cancel.token()));
 
-        auto file_path = std::string(workspace.path_pool.resolve(server_path_id));
+    std::stable_partition(
+        index_queue.begin() + index_queue_pos,
+        index_queue.end(),
+        [this](std::uint32_t id) { return workspace.path_to_module.contains(id); });
 
-        if(sessions.contains(server_path_id))
-            continue;
+    auto total = index_queue.size() - index_queue_pos;
+    std::size_t dispatched = 0;
+    std::size_t completed = 0;
 
-        if(!need_update(file_path))
-            continue;
-
-        worker::BuildParams params;
-        params.kind = worker::BuildKind::Index;
-        params.file = file_path;
-        if(!compiler.fill_compile_args(file_path, params.directory, params.arguments, nullptr))
-            continue;
-
-        workspace.fill_pcm_deps(params.pcms);
-
-        LOG_INFO("Background indexing: {}", file_path);
-
-        auto result = co_await pool.send_stateless(params);
-        if(result.has_value() && result.value().success && !result.value().tu_index_data.empty()) {
-            LOG_INFO("Background indexing got TUIndex for {}: {} bytes",
-                     file_path,
-                     result.value().tu_index_data.size());
-            merge(result.value().tu_index_data.data(), result.value().tu_index_data.size());
-            ++processed;
-        } else if(result.has_value() && !result.value().success) {
-            LOG_WARN("Background index failed for {}: {}", file_path, result.value().error);
-        } else if(result.has_value() && result.value().tu_index_data.empty()) {
-            LOG_WARN("Background index returned empty TUIndex for {}", file_path);
+    std::optional<lsp::ProgressReporter<kota::ipc::JsonPeer>> progress;
+    if(peer) {
+        progress.emplace(*peer, protocol::ProgressToken(std::string("clice/backgroundIndex")));
+        auto create_result = co_await progress->create();
+        if(!create_result.has_error()) {
+            progress->begin("Indexing", std::format("0/{} files", total), 0);
         } else {
-            LOG_WARN("Background index IPC error for {}: {}", file_path, result.error().message);
+            progress.reset();
         }
     }
 
+    kota::task_group<> workers(loop);
+    std::size_t in_flight = 0;
+    kota::event slot_available;
+
+    while(index_queue_pos < index_queue.size()) {
+        if(pause_depth > 0)
+            co_await resume_event.wait();
+
+        auto server_path_id = index_queue[index_queue_pos++];
+        auto file_path = std::string(workspace.path_pool.resolve(server_path_id));
+        if(sessions.contains(server_path_id) || !need_update(file_path)) {
+            ++completed;
+            continue;
+        }
+
+        while(in_flight >= max_concurrent) {
+            slot_available.reset();
+            co_await slot_available.wait();
+        }
+
+        ++in_flight;
+        ++dispatched;
+        workers.spawn([&, server_path_id]() -> kota::task<> {
+            co_await index_one(server_path_id);
+            --in_flight;
+            ++completed;
+            if(progress) {
+                auto pct = total > 0 ? static_cast<std::uint32_t>(completed * 100 / total) : 100;
+                progress->report(std::format("{}/{} files", completed, total), pct);
+            }
+            slot_available.set();
+        }());
+    }
+
+    co_await workers.join();
+
+    if(progress) {
+        progress->end(std::format("Indexed {} files", dispatched));
+    }
+
+    monitor_cancel.cancel();
+
     indexing_active = false;
-    LOG_INFO("Background indexing complete: {} files processed", processed);
-    save(workspace.config.index_dir);
+    LOG_INFO("Background indexing complete: {} files dispatched", dispatched);
+    save(workspace.config.project.index_dir);
 }
 
 }  // namespace clice

src/server/compiler/indexer.h

@@ -9,10 +9,12 @@
 
 #include "semantic/relation_kind.h"
 #include "semantic/symbol_kind.h"
-#include "server/workspace.h"
+#include "server/workspace/workspace.h"
 
 #include "kota/async/async.h"
+#include "kota/ipc/codec/json.h"
 #include "kota/ipc/lsp/position.h"
+#include "kota/ipc/lsp/progress.h"
 #include "kota/ipc/lsp/protocol.h"
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/SmallVector.h"
@@ -59,8 +61,49 @@ public:
             WorkerPool& pool,
             Compiler& compiler,
             std::function<bool(std::uint32_t)> is_file_open = {}) :
-        loop(loop), workspace(workspace), sessions(sessions), pool(pool), compiler(compiler),
-        is_file_open(std::move(is_file_open)) {}
+        loop(loop), bg_tasks(loop), workspace(workspace), sessions(sessions), pool(pool),
+        compiler(compiler), is_file_open(std::move(is_file_open)) {}
+
+    /// Set the LSP peer for progress reporting.  Must be called before
+    /// schedule() if progress notifications are desired.
+    void set_peer(kota::ipc::JsonPeer* p) {
+        peer = p;
+    }
+
+    /// Temporarily pause background indexing to give priority to user
+    /// requests.  Indexing tasks already dispatched to workers continue,
+    /// but no new tasks will be sent until resume_indexing() is called.
+    void pause_indexing();
+
+    /// Resume background indexing after a pause.
+    void resume_indexing();
+
+    /// RAII guard that pauses indexing for its lifetime.
+    struct [[nodiscard]] ScopedPause {
+        Indexer& indexer;
+
+        explicit ScopedPause(Indexer& idx) : indexer(idx) {
+            indexer.pause_indexing();
+        }
+
+        ~ScopedPause() {
+            indexer.resume_indexing();
+        }
+
+        ScopedPause(const ScopedPause&) = delete;
+        ScopedPause& operator=(const ScopedPause&) = delete;
+    };
+
+    ScopedPause scoped_pause() {
+        return ScopedPause{*this};
+    }
+
+    /// Set the maximum number of concurrent index tasks.
+    /// Also sets the baseline that dynamic adjustment will restore to.
+    void set_max_concurrency(std::size_t n) {
+        max_concurrent = std::max<std::size_t>(n, 1);
+        baseline_concurrent = max_concurrent;
+    }
 
     /// Add a file to the background indexing queue.
     void enqueue(std::uint32_t server_path_id);
@@ -124,6 +167,43 @@ public:
     std::vector<protocol::SymbolInformation> search_symbols(llvm::StringRef query,
                                                             std::size_t max_results = 100);
 
+    struct DefinitionText {
+        std::string file;
+        int start_line;
+        int end_line;
+        std::string text;
+    };
+
+    /// Get full definition text for a symbol, using stored index ranges and content.
+    std::optional<DefinitionText> get_definition_text(index::SymbolHash hash);
+
+    struct ReferenceWithContext {
+        std::string file;
+        int line;
+        std::string context;
+    };
+
+    /// Collect references (or definitions) with context lines from stored content.
+    std::vector<ReferenceWithContext> collect_references(index::SymbolHash hash, RelationKind kind);
+
+    /// Cancel background indexing and wait for all tasks to settle.
+    kota::task<> stop();
+
+    /// Whether background indexing is currently idle (no active or queued work).
+    bool is_idle() const {
+        return !indexing_active && index_queue_pos >= index_queue.size();
+    }
+
+    /// Number of files remaining in the indexing queue.
+    std::size_t pending_files() const {
+        return index_queue_pos < index_queue.size() ? index_queue.size() - index_queue_pos : 0;
+    }
+
+    /// Total files that were enqueued in the current (or last) indexing round.
+    std::size_t total_queued() const {
+        return index_queue.size();
+    }
+
     /// Convert internal SymbolKind to LSP SymbolKind.
     static protocol::SymbolKind to_lsp_symbol_kind(SymbolKind kind);
 
@@ -165,6 +245,7 @@ private:
 
 private:
     kota::event_loop& loop;
+    kota::task_group<> bg_tasks;
     Workspace& workspace;
     llvm::DenseMap<std::uint32_t, Session>& sessions;
     WorkerPool& pool;
@@ -175,6 +256,9 @@ private:
     /// server-path-id-keyed sessions map to project-level path_ids.
     std::function<bool(std::uint32_t)> is_file_open;
 
+    /// LSP peer for progress reporting (optional, not owned).
+    kota::ipc::JsonPeer* peer = nullptr;
+
     /// Background indexing queue and scheduling state.
     std::vector<std::uint32_t> index_queue;
     std::size_t index_queue_pos = 0;
@@ -182,7 +266,18 @@ private:
     bool indexing_scheduled = false;
     std::shared_ptr<kota::timer> index_idle_timer;
 
+    /// Concurrency control for background indexing.
+    std::size_t max_concurrent = 2;
+    std::size_t baseline_concurrent = 2;
+
+    /// Pause/resume: when paused, new index tasks wait on this event.
+    /// Uses a counter so nested pause/resume pairs work correctly.
+    std::size_t pause_depth = 0;
+    kota::event resume_event{true};
+
     kota::task<> run_background_indexing();
+    kota::task<> index_one(std::uint32_t server_path_id);
+    kota::task<> monitor_resources();
 };
 
 }  // namespace clice

src/server/config.cpp

@@ -1,100 +0,0 @@
-#include "server/config.h"
-
-#include <algorithm>
-#include <thread>
-
-#include "support/filesystem.h"
-#include "support/logging.h"
-
-#include "kota/codec/toml.h"
-
-namespace clice {
-
-/// Replace all occurrences of ${workspace} with the workspace root.
-static void substitute_workspace(std::string& value, const std::string& workspace_root) {
-    constexpr std::string_view placeholder = "${workspace}";
-    std::string::size_type pos = 0;
-    while((pos = value.find(placeholder, pos)) != std::string::npos) {
-        value.replace(pos, placeholder.size(), workspace_root);
-        pos += workspace_root.size();
-    }
-}
-
-void CliceConfig::apply_defaults(const std::string& workspace_root) {
-    auto cpu_count = std::thread::hardware_concurrency();
-    if(cpu_count == 0)
-        cpu_count = 4;
-
-    if(stateful_worker_count == 0) {
-        stateful_worker_count = 2;
-    }
-    if(stateless_worker_count == 0) {
-        stateless_worker_count = 3;
-    }
-    if(worker_memory_limit == 0) {
-        worker_memory_limit = 4ULL * 1024 * 1024 * 1024;  // 4GB default
-    }
-    if(cache_dir.empty() && !workspace_root.empty()) {
-        cache_dir = path::join(workspace_root, ".clice");
-    }
-
-    if(index_dir.empty() && !cache_dir.empty()) {
-        index_dir = path::join(cache_dir, "index");
-    }
-
-    if(logging_dir.empty() && !cache_dir.empty()) {
-        logging_dir = path::join(cache_dir, "logs");
-    }
-
-    // Apply variable substitution to string fields
-    substitute_workspace(compile_commands_path, workspace_root);
-    substitute_workspace(cache_dir, workspace_root);
-    substitute_workspace(index_dir, workspace_root);
-    substitute_workspace(logging_dir, workspace_root);
-}
-
-std::optional<CliceConfig> CliceConfig::load(const std::string& path,
-                                             const std::string& workspace_root) {
-    auto content = fs::read(path);
-    if(!content) {
-        return std::nullopt;
-    }
-
-    auto result = kota::codec::toml::parse<CliceConfig>(*content);
-    if(!result) {
-        LOG_WARN("Failed to parse config file {}", path);
-        return std::nullopt;
-    }
-
-    auto config = std::move(*result);
-    config.apply_defaults(workspace_root);
-
-    LOG_INFO("Loaded config from {}", path);
-    return config;
-}
-
-CliceConfig CliceConfig::load_from_workspace(const std::string& workspace_root) {
-    if(!workspace_root.empty()) {
-        // Try standard config file locations
-        for(auto* name: {"clice.toml", ".clice/config.toml"}) {
-            auto config_path = path::join(workspace_root, name);
-            if(llvm::sys::fs::exists(config_path)) {
-                auto config = load(config_path, workspace_root);
-                if(config)
-                    return std::move(*config);
-            }
-        }
-    }
-
-    // No config file found; use defaults
-    CliceConfig config;
-    config.apply_defaults(workspace_root);
-    LOG_INFO(
-        "No clice.toml found, using default configuration " "(stateful={}, stateless={}, memory_limit={}MB)",
-        config.stateful_worker_count,
-        config.stateless_worker_count,
-        config.worker_memory_limit / (1024 * 1024));
-    return config;
-}
-
-}  // namespace clice

src/server/config.h

@@ -1,46 +0,0 @@
-#pragma once
-
-#include <cstdint>
-#include <optional>
-#include <string>
-
-namespace clice {
-
-/// Configuration for the clice LSP server, loadable from clice.toml.
-struct CliceConfig {
-    // Worker configuration (0 = auto-detect from system resources)
-    std::uint32_t stateful_worker_count = 0;
-    std::uint32_t stateless_worker_count = 0;
-    std::uint64_t worker_memory_limit = 0;  // bytes; 0 = auto
-
-    // Compilation database path (empty = auto-detect)
-    std::string compile_commands_path;
-
-    // Cache directory (empty = default: <workspace>/.clice/)
-    std::string cache_dir;
-
-    // Index storage directory (default: <cache_dir>/index/)
-    std::string index_dir;
-
-    // Logging directory (default: <cache_dir>/logs/)
-    std::string logging_dir;
-
-    // Background indexing
-    bool enable_indexing = true;
-    int idle_timeout_ms = 3000;
-
-    /// Compute default values for any field left at its zero/empty sentinel.
-    void apply_defaults(const std::string& workspace_root);
-
-    /// Try to load configuration from a TOML file.
-    /// Performs ${workspace} variable substitution in string fields.
-    /// Returns std::nullopt if the file does not exist or cannot be parsed.
-    static std::optional<CliceConfig> load(const std::string& path,
-                                           const std::string& workspace_root);
-
-    /// Load config from the workspace, trying standard locations.
-    /// Returns a default config (with apply_defaults) if no file is found.
-    static CliceConfig load_from_workspace(const std::string& workspace_root);
-};
-
-}  // namespace clice

src/server/master_server.h

@@ -1,80 +0,0 @@
-#pragma once
-
-#include <cstdint>
-#include <memory>
-#include <string>
-#include <vector>
-
-#include "server/compiler.h"
-#include "server/indexer.h"
-#include "server/session.h"
-#include "server/worker_pool.h"
-#include "server/workspace.h"
-
-#include "kota/async/async.h"
-#include "kota/codec/raw_value.h"
-#include "kota/ipc/peer.h"
-#include "llvm/ADT/DenseMap.h"
-
-namespace clice {
-
-enum class ServerLifecycle : std::uint8_t {
-    Uninitialized,
-    Initialized,
-    Ready,
-    ShuttingDown,
-    Exited,
-};
-
-/// Top-level LSP server — the single orchestration point for the language
-/// server process.
-///
-/// Responsibilities:
-///   - Owns the two-layer state model: Workspace (disk truth) and Sessions
-///     (per-open-file volatile state).
-///   - Manages Session lifecycle directly: didOpen creates, didChange mutates,
-///     didSave syncs to Workspace, didClose destroys.
-///   - Dispatches compilation and feature queries to Compiler.
-///   - Dispatches index lookups and background indexing to Indexer.
-///
-/// Design principle:
-///   Open files are never depended upon by other files.  Dependencies always
-///   point to disk files.  The only path from Session to Workspace is didSave.
-class MasterServer {
-public:
-    MasterServer(kota::event_loop& loop, kota::ipc::JsonPeer& peer, std::string self_path);
-    ~MasterServer();
-
-    void register_handlers();
-
-private:
-    kota::event_loop& loop;
-    kota::ipc::JsonPeer& peer;
-
-    /// Persistent project-wide state (config, CDB, path pool, dependency
-    /// graphs, compilation caches, symbol index).
-    Workspace workspace;
-
-    /// Per-file editing sessions, keyed by server-level path_id.
-    llvm::DenseMap<std::uint32_t, Session> sessions;
-
-    /// Worker process pool for offloading compilation and queries.
-    WorkerPool pool;
-
-    /// Compilation lifecycle manager (reads/writes workspace and sessions).
-    Compiler compiler;
-
-    /// Index query and background scheduling (reads from workspace and sessions).
-    Indexer indexer;
-
-    ServerLifecycle lifecycle = ServerLifecycle::Uninitialized;
-    std::string self_path;
-    std::string workspace_root;
-    std::string session_log_dir;
-
-    kota::task<> load_workspace();
-
-    using RawResult = kota::task<kota::codec::RawValue, kota::ipc::Error>;
-};
-
-}  // namespace clice

src/server/protocol/agentic.h

@@ -0,0 +1,311 @@
+#pragma once
+
+#include <cstdint>
+#include <optional>
+#include <string>
+#include <vector>
+
+#include "kota/ipc/lsp/protocol.h"
+#include "kota/ipc/protocol.h"
+
+namespace clice::agentic {
+
+struct CompileCommandParams {
+    std::string path;
+};
+
+struct CompileCommandResult {
+    std::string file;
+    std::string directory;
+    std::vector<std::string> arguments;
+};
+
+struct FileInfo {
+    std::string path;
+    std::string kind;
+    std::optional<std::string> module_name;
+};
+
+struct ProjectFilesParams {
+    std::optional<std::string> filter;
+};
+
+struct ProjectFilesResult {
+    std::vector<FileInfo> files;
+    int total = 0;
+};
+
+struct DepEntry {
+    std::string path;
+    int depth = 0;
+};
+
+struct FileDepsParams {
+    std::string path;
+    std::optional<std::string> direction;
+    std::optional<int> depth;
+};
+
+struct FileDepsResult {
+    std::string file;
+    std::vector<DepEntry> includes;
+    std::vector<DepEntry> includers;
+};
+
+struct ImpactAnalysisParams {
+    std::string path;
+};
+
+struct ImpactAnalysisResult {
+    std::vector<std::string> direct_dependents;
+    std::vector<std::string> transitive_dependents;
+    std::vector<std::string> affected_modules;
+};
+
+struct SymbolEntry {
+    std::string name;
+    std::string kind;
+    std::string file;
+    int line = 0;
+    std::optional<std::string> container;
+    std::uint64_t symbol_id = 0;
+};
+
+struct SymbolSearchParams {
+    std::string query;
+    std::optional<std::vector<std::string>> kind_filter;
+    std::optional<int> max_results;
+};
+
+struct SymbolSearchResult {
+    std::vector<SymbolEntry> symbols;
+};
+
+struct ReadSymbolParams {
+    std::optional<std::string> name;
+    std::optional<std::string> path;
+    std::optional<int> line;
+    std::optional<std::uint64_t> symbol_id;
+};
+
+struct ReadSymbolResult {
+    std::string name;
+    std::string kind;
+    std::string file;
+    int start_line = 0;
+    int end_line = 0;
+    std::string text;
+    std::optional<std::string> signature;
+    std::uint64_t symbol_id = 0;
+};
+
+struct DocumentSymbolEntry {
+    std::string name;
+    std::string kind;
+    int start_line = 0;
+    int end_line = 0;
+    std::uint64_t symbol_id = 0;
+};
+
+struct DocumentSymbolsParams {
+    std::string path;
+};
+
+struct DocumentSymbolsResult {
+    std::vector<DocumentSymbolEntry> symbols;
+};
+
+struct DefinitionParams {
+    std::optional<std::string> name;
+    std::optional<std::string> path;
+    std::optional<int> line;
+    std::optional<std::uint64_t> symbol_id;
+};
+
+struct LocationEntry {
+    std::string file;
+    int start_line = 0;
+    int end_line = 0;
+    std::string text;
+};
+
+struct DefinitionResult {
+    std::string name;
+    std::string kind;
+    std::uint64_t symbol_id = 0;
+    std::optional<LocationEntry> definition;
+};
+
+struct ReferenceEntry {
+    std::string file;
+    int line = 0;
+    std::string context;
+};
+
+struct ReferencesParams {
+    std::optional<std::string> name;
+    std::optional<std::string> path;
+    std::optional<int> line;
+    std::optional<std::uint64_t> symbol_id;
+    std::optional<bool> include_declaration;
+};
+
+struct ReferencesResult {
+    std::string name;
+    std::string kind;
+    std::uint64_t symbol_id = 0;
+    std::vector<ReferenceEntry> references;
+    int total = 0;
+};
+
+struct CallGraphEntry {
+    std::string name;
+    std::string kind;
+    std::string file;
+    int line = 0;
+    std::uint64_t symbol_id = 0;
+};
+
+struct CallGraphParams {
+    std::optional<std::string> name;
+    std::optional<std::string> path;
+    std::optional<int> line;
+    std::optional<std::uint64_t> symbol_id;
+    std::optional<std::string> direction;
+    std::optional<int> depth;
+};
+
+struct CallGraphResult {
+    CallGraphEntry root;
+    std::vector<CallGraphEntry> callers;
+    std::vector<CallGraphEntry> callees;
+};
+
+struct TypeHierarchyEntry {
+    std::string name;
+    std::string kind;
+    std::string file;
+    int line = 0;
+    std::uint64_t symbol_id = 0;
+};
+
+struct TypeHierarchyParams {
+    std::optional<std::string> name;
+    std::optional<std::string> path;
+    std::optional<int> line;
+    std::optional<std::uint64_t> symbol_id;
+    std::optional<std::string> direction;
+};
+
+struct TypeHierarchyResult {
+    TypeHierarchyEntry root;
+    std::vector<TypeHierarchyEntry> supertypes;
+    std::vector<TypeHierarchyEntry> subtypes;
+};
+
+struct LintParams {
+    std::string path;
+    std::optional<int> line;
+};
+
+using LintResult = std::vector<kota::ipc::protocol::Diagnostic>;
+
+struct StatusParams {};
+
+struct StatusResult {
+    bool idle = true;
+    int pending = 0;
+    int total = 0;
+    int indexed = 0;
+};
+
+struct ShutdownParams {};
+
+}  // namespace clice::agentic
+
+namespace kota::ipc::protocol {
+
+template <>
+struct RequestTraits<clice::agentic::CompileCommandParams> {
+    using Result = clice::agentic::CompileCommandResult;
+    constexpr inline static std::string_view method = "agentic/compileCommand";
+};
+
+template <>
+struct RequestTraits<clice::agentic::ProjectFilesParams> {
+    using Result = clice::agentic::ProjectFilesResult;
+    constexpr inline static std::string_view method = "agentic/projectFiles";
+};
+
+template <>
+struct RequestTraits<clice::agentic::FileDepsParams> {
+    using Result = clice::agentic::FileDepsResult;
+    constexpr inline static std::string_view method = "agentic/fileDeps";
+};
+
+template <>
+struct RequestTraits<clice::agentic::ImpactAnalysisParams> {
+    using Result = clice::agentic::ImpactAnalysisResult;
+    constexpr inline static std::string_view method = "agentic/impactAnalysis";
+};
+
+template <>
+struct RequestTraits<clice::agentic::SymbolSearchParams> {
+    using Result = clice::agentic::SymbolSearchResult;
+    constexpr inline static std::string_view method = "agentic/symbolSearch";
+};
+
+template <>
+struct RequestTraits<clice::agentic::ReadSymbolParams> {
+    using Result = clice::agentic::ReadSymbolResult;
+    constexpr inline static std::string_view method = "agentic/readSymbol";
+};
+
+template <>
+struct RequestTraits<clice::agentic::DocumentSymbolsParams> {
+    using Result = clice::agentic::DocumentSymbolsResult;
+    constexpr inline static std::string_view method = "agentic/documentSymbols";
+};
+
+template <>
+struct RequestTraits<clice::agentic::DefinitionParams> {
+    using Result = clice::agentic::DefinitionResult;
+    constexpr inline static std::string_view method = "agentic/definition";
+};
+
+template <>
+struct RequestTraits<clice::agentic::ReferencesParams> {
+    using Result = clice::agentic::ReferencesResult;
+    constexpr inline static std::string_view method = "agentic/references";
+};
+
+template <>
+struct RequestTraits<clice::agentic::CallGraphParams> {
+    using Result = clice::agentic::CallGraphResult;
+    constexpr inline static std::string_view method = "agentic/callGraph";
+};
+
+template <>
+struct RequestTraits<clice::agentic::TypeHierarchyParams> {
+    using Result = clice::agentic::TypeHierarchyResult;
+    constexpr inline static std::string_view method = "agentic/typeHierarchy";
+};
+
+template <>
+struct RequestTraits<clice::agentic::LintParams> {
+    using Result = clice::agentic::LintResult;
+    constexpr inline static std::string_view method = "agentic/lint";
+};
+
+template <>
+struct RequestTraits<clice::agentic::StatusParams> {
+    using Result = clice::agentic::StatusResult;
+    constexpr inline static std::string_view method = "agentic/status";
+};
+
+template <>
+struct NotificationTraits<clice::agentic::ShutdownParams> {
+    constexpr inline static std::string_view method = "agentic/shutdown";
+};
+
+}  // namespace kota::ipc::protocol

src/server/protocol/extension.h

@@ -0,0 +1,42 @@
+#pragma once
+
+#include <optional>
+#include <string>
+#include <vector>
+
+namespace clice::ext {
+
+struct ContextItem {
+    std::string label;
+    std::string description;
+    std::string uri;
+};
+
+struct QueryContextParams {
+    std::string uri;
+    std::optional<int> offset;
+};
+
+struct QueryContextResult {
+    std::vector<ContextItem> contexts;
+    int total = 0;
+};
+
+struct CurrentContextParams {
+    std::string uri;
+};
+
+struct CurrentContextResult {
+    std::optional<ContextItem> context;
+};
+
+struct SwitchContextParams {
+    std::string uri;
+    std::string context_uri;
+};
+
+struct SwitchContextResult {
+    bool success = false;
+};
+
+}  // namespace clice::ext

src/server/protocol/worker.h

@@ -1,7 +1,6 @@
 #pragma once
 
 #include <cstdint>
-#include <optional>
 #include <string>
 #include <unordered_map>
 #include <utility>
@@ -9,8 +8,7 @@
 
 #include "syntax/token.h"
 
-#include "kota/codec/raw_value.h"
-#include "kota/ipc/lsp/protocol.h"
+#include "kota/codec/json/json.h"
 #include "kota/ipc/protocol.h"
 
 namespace clice::worker {
@@ -45,6 +43,7 @@ struct CompileParams {
     std::string text;
     std::string directory;
     std::vector<std::string> arguments;
+    bool clang_tidy = false;
     std::pair<std::string, uint32_t> pch;
     std::unordered_map<std::string, std::string> pcms;
 };
@@ -66,6 +65,7 @@ enum class BuildKind : uint8_t {
     Index,
     Completion,
     SignatureHelp,
+    Format,
 };
 
 /// Unified parameters for all stateless build/compilation tasks.
@@ -76,6 +76,7 @@ enum class BuildKind : uint8_t {
 ///   - Index:         + pcms
 ///   - Completion:    + text, version, offset, pch, pcms
 ///   - SignatureHelp: + text, version, offset, pch, pcms
+///   - Format:        + text, format_range (optional)
 struct BuildParams {
     BuildKind kind;
     std::string file;
@@ -92,6 +93,7 @@ struct BuildParams {
     std::string output_path;               ///< BuildPCH, BuildPCM
     std::string module_name;               ///< BuildPCM
     uint32_t preamble_bound = UINT32_MAX;  ///< BuildPCH
+    LocalSourceRange format_range;         ///< Format (default = full document)
 };
 
 /// Unified result for stateless build tasks.
@@ -122,43 +124,6 @@ struct EvictedParams {
 
 }  // namespace clice::worker
 
-namespace clice::ext {
-
-struct ContextItem {
-    std::string label;
-    std::string description;
-    std::string uri;
-};
-
-struct QueryContextParams {
-    std::string uri;
-    std::optional<int> offset;
-};
-
-struct QueryContextResult {
-    std::vector<ContextItem> contexts;
-    int total;
-};
-
-struct CurrentContextParams {
-    std::string uri;
-};
-
-struct CurrentContextResult {
-    std::optional<ContextItem> context;
-};
-
-struct SwitchContextParams {
-    std::string uri;
-    std::string context_uri;
-};
-
-struct SwitchContextResult {
-    bool success;
-};
-
-}  // namespace clice::ext
-
 namespace kota::ipc::protocol {
 
 template <>

src/server/service/agent_client.cpp

@@ -0,0 +1,820 @@
+#include "server/service/agent_client.h"
+
+#include <algorithm>
+#include <format>
+#include <ranges>
+#include <string>
+#include <vector>
+
+#include "compile/compilation.h"
+#include "feature/feature.h"
+#include "server/protocol/agentic.h"
+#include "server/service/master_server.h"
+#include "support/filesystem.h"
+#include "support/logging.h"
+
+#include "kota/async/async.h"
+#include "kota/ipc/lsp/uri.h"
+#include "kota/meta/enum.h"
+#include "llvm/ADT/DenseSet.h"
+#include "llvm/ADT/SmallVector.h"
+
+namespace clice {
+
+using kota::ipc::RequestResult;
+using RequestContext = kota::ipc::JsonPeer::RequestContext;
+namespace lsp = kota::ipc::lsp;
+namespace protocol = kota::ipc::protocol;
+
+static std::string_view symbol_kind_name(SymbolKind kind) {
+    constexpr auto names = kota::meta::reflection<SymbolKind::Kind>::member_names;
+    auto idx = static_cast<std::size_t>(kind.value());
+    if(idx < names.size())
+        return names[idx];
+    return "Unknown";
+}
+
+struct ResolvedSymbol {
+    index::SymbolHash hash = 0;
+    std::string name;
+    SymbolKind kind;
+    std::string file;
+    int line = 0;
+};
+
+static std::vector<ResolvedSymbol> resolve_locator(const agentic::ReadSymbolParams& loc,
+                                                   Workspace& workspace,
+                                                   llvm::DenseMap<std::uint32_t, Session>& sessions,
+                                                   Indexer& indexer) {
+    if(loc.symbol_id.has_value() && *loc.symbol_id != 0) {
+        auto hash = static_cast<index::SymbolHash>(*loc.symbol_id);
+        std::string name;
+        SymbolKind kind;
+        if(!indexer.find_symbol_info(hash, name, kind))
+            return {};
+        auto def_loc = indexer.find_definition_location(hash);
+        if(!def_loc)
+            return {};
+        auto file = uri_to_path(def_loc->uri);
+        int line_num = static_cast<int>(def_loc->range.start.line) + 1;
+        return {
+            {hash, std::move(name), kind, std::move(file), line_num}
+        };
+    }
+
+    if(loc.name.has_value() && !loc.name->empty()) {
+        std::string query_lower = llvm::StringRef(*loc.name).lower();
+        std::vector<ResolvedSymbol> candidates;
+        std::vector<ResolvedSymbol> exact_matches;
+        llvm::DenseSet<index::SymbolHash> seen;
+
+        auto try_symbol = [&](index::SymbolHash hash, const index::Symbol& symbol) {
+            if(symbol.name.empty())
+                return;
+            if(llvm::StringRef(symbol.name).lower().find(query_lower) == std::string::npos)
+                return;
+            auto def_loc = indexer.find_definition_location(hash);
+            if(!def_loc)
+                return;
+            if(!seen.insert(hash).second)
+                return;
+
+            auto file = uri_to_path(def_loc->uri);
+            int line_num = static_cast<int>(def_loc->range.start.line) + 1;
+
+            if(loc.path.has_value() && !loc.path->empty()) {
+                llvm::StringRef wanted(*loc.path);
+                bool basename_only = wanted.find_last_of("/\\") == llvm::StringRef::npos;
+                if(basename_only) {
+                    if(llvm::sys::path::filename(file) != wanted)
+                        return;
+                } else if(!llvm::StringRef(file).ends_with(wanted)) {
+                    return;
+                }
+            }
+
+            bool is_exact = llvm::StringRef(symbol.name).lower() == query_lower ||
+                            llvm::StringRef(symbol.name).ends_with("::" + *loc.name);
+
+            ResolvedSymbol rs{hash, symbol.name, symbol.kind, std::move(file), line_num};
+            if(is_exact)
+                exact_matches.push_back(std::move(rs));
+            else
+                candidates.push_back(std::move(rs));
+        };
+
+        for(auto& [hash, symbol]: workspace.project_index.symbols)
+            try_symbol(hash, symbol);
+        for(auto& [_, sess]: sessions) {
+            if(!sess.file_index)
+                continue;
+            for(auto& [hash, symbol]: sess.file_index->symbols)
+                try_symbol(hash, symbol);
+        }
+
+        if(!exact_matches.empty())
+            return exact_matches;
+        return candidates;
+    }
+
+    if(loc.path.has_value() && loc.line.has_value()) {
+        auto path_str = *loc.path;
+        auto target_line = static_cast<protocol::uinteger>(*loc.line - 1);
+
+        auto pool_it = workspace.path_pool.cache.find(path_str);
+        auto server_id = pool_it != workspace.path_pool.cache.end() ? pool_it->second : ~0u;
+        auto* sess =
+            server_id != ~0u && sessions.contains(server_id) ? &sessions[server_id] : nullptr;
+        if(sess && sess->file_index) {
+            auto& fi = *sess->file_index;
+            if(fi.mapper) {
+                for(auto& [hash, rels]: fi.file_index.relations) {
+                    for(auto& rel: rels) {
+                        if(rel.kind.value() != RelationKind::Definition)
+                            continue;
+                        auto start = fi.mapper->to_position(rel.range.begin);
+                        if(start && start->line == target_line) {
+                            std::string name;
+                            SymbolKind kind;
+                            if(indexer.find_symbol_info(hash, name, kind))
+                                return {
+                                    {hash, std::move(name), kind, path_str, *loc.line}
+                                };
+                        }
+                    }
+                }
+            }
+        }
+
+        auto it = workspace.project_index.path_pool.find(path_str);
+        if(it == workspace.project_index.path_pool.cache.end())
+            return {};
+
+        auto proj_id = it->second;
+        auto shard_it = workspace.merged_indices.find(proj_id);
+        if(shard_it == workspace.merged_indices.end())
+            return {};
+
+        for(auto& [hash, symbol]: workspace.project_index.symbols) {
+            if(!symbol.reference_files.contains(proj_id))
+                continue;
+            bool found = false;
+            shard_it->second.find_relations(hash,
+                                            RelationKind::Definition,
+                                            [&](const index::Relation&, protocol::Range range) {
+                                                if(range.start.line == target_line) {
+                                                    found = true;
+                                                    return false;
+                                                }
+                                                return true;
+                                            });
+            if(found)
+                return {
+                    {hash, symbol.name, symbol.kind, path_str, *loc.line}
+                };
+        }
+
+        return {};
+    }
+
+    return {};
+}
+
+static std::uint64_t extract_symbol_id(const std::optional<protocol::LSPAny>& data) {
+    if(!data.has_value())
+        return 0;
+    if(auto* val = std::get_if<std::int64_t>(&static_cast<const protocol::LSPVariant&>(*data)))
+        return static_cast<std::uint64_t>(*val);
+    LOG_WARN("extract_symbol_id: unexpected LSPAny variant type");
+    return 0;
+}
+
+AgentClient::AgentClient(MasterServer& server, kota::ipc::JsonPeer& peer) :
+    server(server), peer(peer) {
+    using namespace agentic;
+
+    auto& srv = this->server;
+
+    peer.on_request(
+        [&srv](RequestContext&,
+               const CompileCommandParams& params) -> RequestResult<CompileCommandParams> {
+            std::string directory;
+            std::vector<std::string> arguments;
+            if(!srv.compiler.fill_compile_args(params.path, directory, arguments)) {
+                co_return kota::outcome_error(
+                    kota::ipc::Error{std::format("no compile command found for {}", params.path)});
+            }
+
+            co_return CompileCommandResult{
+                .file = params.path,
+                .directory = std::move(directory),
+                .arguments = std::move(arguments),
+            };
+        });
+
+    peer.on_request([&srv](RequestContext&,
+                           const ProjectFilesParams& params) -> RequestResult<ProjectFilesParams> {
+        auto& ws = srv.workspace;
+        auto filter = params.filter.value_or("all");
+
+        ProjectFilesResult result;
+        llvm::DenseSet<std::uint32_t> seen;
+
+        for(auto& entry: ws.cdb.get_entries()) {
+            auto file_path = ws.cdb.resolve_path(entry.file);
+            if(file_path.empty())
+                continue;
+
+            auto proj_it = ws.project_index.path_pool.find(file_path);
+            if(proj_it != ws.project_index.path_pool.cache.end()) {
+                if(!seen.insert(proj_it->second).second)
+                    continue;
+            }
+
+            std::string kind_str;
+            auto mod_it = ws.path_to_module.find(ws.path_pool.intern(file_path));
+            if(mod_it != ws.path_to_module.end()) {
+                kind_str = "module";
+            } else {
+                auto ext = llvm::sys::path::extension(file_path);
+                if(ext == ".h" || ext == ".hpp" || ext == ".hxx" || ext == ".hh")
+                    kind_str = "header";
+                else
+                    kind_str = "source";
+            }
+
+            if(filter != "all" && filter != kind_str)
+                continue;
+
+            FileInfo fi;
+            fi.path = file_path.str();
+            fi.kind = std::move(kind_str);
+            if(mod_it != ws.path_to_module.end())
+                fi.module_name = mod_it->second;
+            result.files.push_back(std::move(fi));
+        }
+
+        if(filter == "all" || filter == "header") {
+            for(auto& [path_id, shard]: ws.merged_indices) {
+                if(seen.contains(path_id))
+                    continue;
+                auto path_str = ws.project_index.path_pool.path(path_id);
+                auto ext = llvm::sys::path::extension(path_str);
+                if(ext == ".h" || ext == ".hpp" || ext == ".hxx" || ext == ".hh") {
+                    seen.insert(path_id);
+                    result.files.push_back(FileInfo{
+                        .path = path_str.str(),
+                        .kind = "header",
+                    });
+                }
+            }
+        }
+
+        result.total = static_cast<int>(result.files.size());
+        co_return result;
+    });
+
+    peer.on_request(
+        [&srv](RequestContext&, const FileDepsParams& params) -> RequestResult<FileDepsParams> {
+            auto& ws = srv.workspace;
+            auto pool_it = ws.path_pool.cache.find(params.path);
+            if(pool_it == ws.path_pool.cache.end())
+                co_return FileDepsResult{.file = params.path};
+            auto path_id = pool_it->second;
+            auto direction = params.direction.value_or("both");
+            auto max_depth = params.depth.value_or(1);
+
+            FileDepsResult result;
+            result.file = params.path;
+
+            if(direction == "includes" || direction == "both") {
+                auto includes = ws.dep_graph.get_all_includes(path_id);
+                for(auto inc_id: includes) {
+                    auto real_id = inc_id & DependencyGraph::PATH_ID_MASK;
+                    auto inc_path = ws.path_pool.resolve(real_id);
+                    result.includes.push_back(DepEntry{.path = inc_path.str(), .depth = 1});
+                }
+
+                if(max_depth == 0 || max_depth > 1) {
+                    llvm::DenseSet<std::uint32_t> visited;
+                    visited.insert(path_id);
+                    for(auto& dep: result.includes)
+                        visited.insert(ws.path_pool.intern(dep.path));
+
+                    for(std::size_t i = 0; i < result.includes.size(); ++i) {
+                        if(max_depth > 0 && result.includes[i].depth >= max_depth)
+                            continue;
+                        auto dep_id = ws.path_pool.intern(result.includes[i].path);
+                        auto sub = ws.dep_graph.get_all_includes(dep_id);
+                        for(auto sub_id: sub) {
+                            auto real_id = sub_id & DependencyGraph::PATH_ID_MASK;
+                            if(!visited.insert(real_id).second)
+                                continue;
+                            auto sub_path = ws.path_pool.resolve(real_id);
+                            result.includes.push_back(DepEntry{
+                                .path = sub_path.str(),
+                                .depth = result.includes[i].depth + 1,
+                            });
+                        }
+                    }
+                }
+            }
+
+            if(direction == "includers" || direction == "both") {
+                auto includers = ws.dep_graph.get_includers(path_id);
+                for(auto inc_id: includers) {
+                    auto inc_path = ws.path_pool.resolve(inc_id);
+                    result.includers.push_back(DepEntry{.path = inc_path.str(), .depth = 1});
+                }
+
+                if(max_depth == 0 || max_depth > 1) {
+                    llvm::DenseSet<std::uint32_t> visited;
+                    visited.insert(path_id);
+                    for(auto& dep: result.includers) {
+                        auto it = ws.path_pool.cache.find(dep.path);
+                        if(it != ws.path_pool.cache.end())
+                            visited.insert(it->second);
+                    }
+
+                    for(std::size_t i = 0; i < result.includers.size(); ++i) {
+                        if(max_depth > 0 && result.includers[i].depth >= max_depth)
+                            continue;
+                        auto dep_it = ws.path_pool.cache.find(result.includers[i].path);
+                        if(dep_it == ws.path_pool.cache.end())
+                            continue;
+                        auto sub = ws.dep_graph.get_includers(dep_it->second);
+                        for(auto sub_id: sub) {
+                            if(!visited.insert(sub_id).second)
+                                continue;
+                            auto sub_path = ws.path_pool.resolve(sub_id);
+                            result.includers.push_back(DepEntry{
+                                .path = sub_path.str(),
+                                .depth = result.includers[i].depth + 1,
+                            });
+                        }
+                    }
+                }
+            }
+
+            co_return result;
+        });
+
+    peer.on_request(
+        [&srv](RequestContext&,
+               const ImpactAnalysisParams& params) -> RequestResult<ImpactAnalysisParams> {
+            auto& ws = srv.workspace;
+            auto pool_it = ws.path_pool.cache.find(params.path);
+            if(pool_it == ws.path_pool.cache.end())
+                co_return ImpactAnalysisResult{};
+            auto path_id = pool_it->second;
+
+            ImpactAnalysisResult result;
+
+            auto direct_includers = ws.dep_graph.get_includers(path_id);
+            for(auto inc_id: direct_includers) {
+                result.direct_dependents.push_back(ws.path_pool.resolve(inc_id).str());
+            }
+
+            auto hosts = ws.dep_graph.find_host_sources(path_id);
+            llvm::DenseSet<std::uint32_t> seen;
+            seen.insert(path_id);
+            for(auto inc_id: direct_includers)
+                seen.insert(inc_id);
+            for(auto host_id: hosts) {
+                if(seen.insert(host_id).second)
+                    result.transitive_dependents.push_back(ws.path_pool.resolve(host_id).str());
+            }
+
+            for(auto host_id: hosts) {
+                auto it = ws.path_to_module.find(host_id);
+                if(it != ws.path_to_module.end())
+                    result.affected_modules.push_back(it->second);
+            }
+            auto mod_it = ws.path_to_module.find(path_id);
+            if(mod_it != ws.path_to_module.end())
+                result.affected_modules.push_back(mod_it->second);
+
+            co_return result;
+        });
+
+    peer.on_request([&srv](RequestContext&,
+                           const SymbolSearchParams& params) -> RequestResult<SymbolSearchParams> {
+        auto max = params.max_results.value_or(100);
+        std::string query_lower = llvm::StringRef(params.query).lower();
+
+        SymbolSearchResult result;
+        llvm::DenseSet<index::SymbolHash> seen;
+
+        auto try_symbol = [&](index::SymbolHash hash, const index::Symbol& symbol) {
+            if(static_cast<int>(result.symbols.size()) >= max)
+                return;
+            if(symbol.name.empty())
+                return;
+            if(!query_lower.empty() &&
+               llvm::StringRef(symbol.name).lower().find(query_lower) == std::string::npos)
+                return;
+            if(params.kind_filter.has_value()) {
+                auto kind_name = std::string(symbol_kind_name(symbol.kind));
+                auto& filter = *params.kind_filter;
+                if(std::ranges::find(filter, kind_name) == filter.end())
+                    return;
+            }
+            auto def_loc = srv.indexer.find_definition_location(hash);
+            if(!def_loc)
+                return;
+            if(!seen.insert(hash).second)
+                return;
+            auto file = uri_to_path(def_loc->uri);
+            result.symbols.push_back(SymbolEntry{
+                .name = symbol.name,
+                .kind = std::string(symbol_kind_name(symbol.kind)),
+                .file = std::move(file),
+                .line = static_cast<int>(def_loc->range.start.line) + 1,
+                .symbol_id = hash,
+            });
+        };
+
+        for(auto& [hash, symbol]: srv.workspace.project_index.symbols)
+            try_symbol(hash, symbol);
+        for(auto& [_, sess]: srv.sessions) {
+            if(!sess.file_index)
+                continue;
+            for(auto& [hash, symbol]: sess.file_index->symbols)
+                try_symbol(hash, symbol);
+        }
+
+        co_return result;
+    });
+
+    peer.on_request(
+        [&srv](RequestContext&, const ReadSymbolParams& params) -> RequestResult<ReadSymbolParams> {
+            auto candidates = resolve_locator(params, srv.workspace, srv.sessions, srv.indexer);
+            if(candidates.empty())
+                co_return kota::outcome_error(kota::ipc::Error{"symbol not found"});
+            if(candidates.size() > 1) {
+                co_return kota::outcome_error(kota::ipc::Error{
+                    std::format("ambiguous: {} candidates, use symbolId to disambiguate",
+                                candidates.size())});
+            }
+
+            auto& rs = candidates[0];
+            auto def_text = srv.indexer.get_definition_text(rs.hash);
+            if(!def_text)
+                co_return kota::outcome_error(kota::ipc::Error{"definition not found"});
+
+            co_return ReadSymbolResult{
+                .name = rs.name,
+                .kind = std::string(symbol_kind_name(rs.kind)),
+                .file = std::move(def_text->file),
+                .start_line = def_text->start_line,
+                .end_line = def_text->end_line,
+                .text = std::move(def_text->text),
+                .symbol_id = rs.hash,
+            };
+        });
+
+    peer.on_request(
+        [&srv](RequestContext&,
+               const DocumentSymbolsParams& params) -> RequestResult<DocumentSymbolsParams> {
+            auto is_document_level = [](SymbolKind kind) {
+                return kind == SymbolKind::Namespace || kind == SymbolKind::Class ||
+                       kind == SymbolKind::Struct || kind == SymbolKind::Union ||
+                       kind == SymbolKind::Enum || kind == SymbolKind::Type ||
+                       kind == SymbolKind::Field || kind == SymbolKind::EnumMember ||
+                       kind == SymbolKind::Function || kind == SymbolKind::Method ||
+                       kind == SymbolKind::Variable || kind == SymbolKind::Macro ||
+                       kind == SymbolKind::Concept || kind == SymbolKind::Module ||
+                       kind == SymbolKind::Operator || kind == SymbolKind::Attribute;
+            };
+
+            DocumentSymbolsResult result;
+
+            auto pool_it = srv.workspace.path_pool.cache.find(params.path);
+            if(pool_it == srv.workspace.path_pool.cache.end())
+                co_return result;
+            auto server_id = pool_it->second;
+            auto sess_it = srv.sessions.find(server_id);
+            if(sess_it != srv.sessions.end() && sess_it->second.file_index) {
+                auto& fi = *sess_it->second.file_index;
+                for(auto& [hash, rels]: fi.file_index.relations) {
+                    for(auto& rel: rels) {
+                        if(rel.kind.value() != RelationKind::Definition)
+                            continue;
+                        std::string name;
+                        SymbolKind kind;
+                        if(!srv.indexer.find_symbol_info(hash, name, kind))
+                            continue;
+                        if(!is_document_level(kind))
+                            continue;
+                        if(fi.mapper) {
+                            auto start = fi.mapper->to_position(rel.range.begin);
+                            auto end = fi.mapper->to_position(rel.range.end);
+                            if(start && end) {
+                                result.symbols.push_back(DocumentSymbolEntry{
+                                    .name = std::move(name),
+                                    .kind = std::string(symbol_kind_name(kind)),
+                                    .start_line = static_cast<int>(start->line) + 1,
+                                    .end_line = static_cast<int>(end->line) + 1,
+                                    .symbol_id = hash,
+                                });
+                                break;
+                            }
+                        }
+                    }
+                }
+                co_return result;
+            }
+
+            auto it = srv.workspace.project_index.path_pool.find(params.path);
+            if(it == srv.workspace.project_index.path_pool.cache.end())
+                co_return result;
+
+            auto proj_id = it->second;
+            auto shard_it = srv.workspace.merged_indices.find(proj_id);
+            if(shard_it == srv.workspace.merged_indices.end())
+                co_return result;
+
+            for(auto& [hash, symbol]: srv.workspace.project_index.symbols) {
+                if(symbol.name.empty())
+                    continue;
+                if(!is_document_level(symbol.kind))
+                    continue;
+                if(!symbol.reference_files.contains(proj_id))
+                    continue;
+
+                shard_it->second.find_relations(
+                    hash,
+                    RelationKind::Definition,
+                    [&](const index::Relation&, protocol::Range range) {
+                        result.symbols.push_back(DocumentSymbolEntry{
+                            .name = symbol.name,
+                            .kind = std::string(symbol_kind_name(symbol.kind)),
+                            .start_line = static_cast<int>(range.start.line) + 1,
+                            .end_line = static_cast<int>(range.end.line) + 1,
+                            .symbol_id = hash,
+                        });
+                        return true;
+                    });
+            }
+
+            co_return result;
+        });
+
+    peer.on_request(
+        [&srv](RequestContext&, const DefinitionParams& params) -> RequestResult<DefinitionParams> {
+            auto candidates = resolve_locator(
+                ReadSymbolParams{params.name, params.path, params.line, params.symbol_id},
+                srv.workspace,
+                srv.sessions,
+                srv.indexer);
+            if(candidates.empty())
+                co_return kota::outcome_error(kota::ipc::Error{"symbol not found"});
+            if(candidates.size() > 1) {
+                co_return kota::outcome_error(kota::ipc::Error{
+                    std::format("ambiguous: {} candidates, use symbolId to disambiguate",
+                                candidates.size())});
+            }
+
+            auto& rs = candidates[0];
+
+            DefinitionResult result;
+            result.name = rs.name;
+            result.kind = std::string(symbol_kind_name(rs.kind));
+            result.symbol_id = rs.hash;
+
+            if(auto def_text = srv.indexer.get_definition_text(rs.hash)) {
+                result.definition = LocationEntry{
+                    .file = std::move(def_text->file),
+                    .start_line = def_text->start_line,
+                    .end_line = def_text->end_line,
+                    .text = std::move(def_text->text),
+                };
+            }
+
+            co_return result;
+        });
+
+    peer.on_request(
+        [&srv](RequestContext&, const ReferencesParams& params) -> RequestResult<ReferencesParams> {
+            auto candidates = resolve_locator(
+                ReadSymbolParams{params.name, params.path, params.line, params.symbol_id},
+                srv.workspace,
+                srv.sessions,
+                srv.indexer);
+            if(candidates.empty())
+                co_return kota::outcome_error(kota::ipc::Error{"symbol not found"});
+            if(candidates.size() > 1) {
+                co_return kota::outcome_error(kota::ipc::Error{
+                    std::format("ambiguous: {} candidates, use symbolId to disambiguate",
+                                candidates.size())});
+            }
+
+            auto& rs = candidates[0];
+
+            ReferencesResult result;
+            result.name = rs.name;
+            result.kind = std::string(symbol_kind_name(rs.kind));
+            result.symbol_id = rs.hash;
+
+            for(auto& ref: srv.indexer.collect_references(rs.hash, RelationKind::Reference)) {
+                result.references.push_back(ReferenceEntry{
+                    .file = std::move(ref.file),
+                    .line = ref.line,
+                    .context = std::move(ref.context),
+                });
+            }
+            if(params.include_declaration.value_or(false)) {
+                for(auto& ref: srv.indexer.collect_references(rs.hash, RelationKind::Definition)) {
+                    result.references.push_back(ReferenceEntry{
+                        .file = std::move(ref.file),
+                        .line = ref.line,
+                        .context = std::move(ref.context),
+                    });
+                }
+            }
+
+            result.total = static_cast<int>(result.references.size());
+            co_return result;
+        });
+
+    peer.on_request(
+        [&srv](RequestContext&, const CallGraphParams& params) -> RequestResult<CallGraphParams> {
+            auto candidates = resolve_locator(
+                ReadSymbolParams{params.name, params.path, params.line, params.symbol_id},
+                srv.workspace,
+                srv.sessions,
+                srv.indexer);
+            if(candidates.empty())
+                co_return kota::outcome_error(kota::ipc::Error{"symbol not found"});
+            if(candidates.size() > 1) {
+                co_return kota::outcome_error(kota::ipc::Error{
+                    std::format("ambiguous: {} candidates, use symbolId to disambiguate",
+                                candidates.size())});
+            }
+
+            auto& rs = candidates[0];
+            auto direction = params.direction.value_or("both");
+
+            CallGraphResult result;
+            result.root = CallGraphEntry{
+                .name = rs.name,
+                .kind = std::string(symbol_kind_name(rs.kind)),
+                .file = rs.file,
+                .line = rs.line,
+                .symbol_id = rs.hash,
+            };
+
+            auto resolve_kind = [&](std::uint64_t sym_id) -> std::string {
+                if(sym_id == 0)
+                    return "Function";
+                std::string name;
+                SymbolKind kind;
+                if(srv.indexer.find_symbol_info(sym_id, name, kind))
+                    return std::string(symbol_kind_name(kind));
+                return "Function";
+            };
+
+            if(direction == "callers" || direction == "both") {
+                auto incoming = srv.indexer.find_incoming_calls(rs.hash);
+                for(auto& call: incoming) {
+                    auto sid = extract_symbol_id(call.from.data);
+                    result.callers.push_back(CallGraphEntry{
+                        .name = call.from.name,
+                        .kind = resolve_kind(sid),
+                        .file = uri_to_path(call.from.uri),
+                        .line = static_cast<int>(call.from.range.start.line) + 1,
+                        .symbol_id = sid,
+                    });
+                }
+            }
+
+            if(direction == "callees" || direction == "both") {
+                auto outgoing = srv.indexer.find_outgoing_calls(rs.hash);
+                for(auto& call: outgoing) {
+                    auto sid = extract_symbol_id(call.to.data);
+                    result.callees.push_back(CallGraphEntry{
+                        .name = call.to.name,
+                        .kind = resolve_kind(sid),
+                        .file = uri_to_path(call.to.uri),
+                        .line = static_cast<int>(call.to.range.start.line) + 1,
+                        .symbol_id = sid,
+                    });
+                }
+            }
+
+            co_return result;
+        });
+
+    peer.on_request(
+        [&srv](RequestContext&,
+               const TypeHierarchyParams& params) -> RequestResult<TypeHierarchyParams> {
+            auto candidates = resolve_locator(
+                ReadSymbolParams{params.name, params.path, params.line, params.symbol_id},
+                srv.workspace,
+                srv.sessions,
+                srv.indexer);
+            if(candidates.empty())
+                co_return kota::outcome_error(kota::ipc::Error{"symbol not found"});
+            if(candidates.size() > 1) {
+                co_return kota::outcome_error(kota::ipc::Error{
+                    std::format("ambiguous: {} candidates, use symbolId to disambiguate",
+                                candidates.size())});
+            }
+
+            auto& rs = candidates[0];
+            auto direction = params.direction.value_or("both");
+
+            TypeHierarchyResult result;
+            result.root = TypeHierarchyEntry{
+                .name = rs.name,
+                .kind = std::string(symbol_kind_name(rs.kind)),
+                .file = rs.file,
+                .line = rs.line,
+                .symbol_id = rs.hash,
+            };
+
+            auto resolve_kind = [&](std::uint64_t sym_id) -> std::string {
+                if(sym_id == 0)
+                    return "Class";
+                std::string name;
+                SymbolKind kind;
+                if(srv.indexer.find_symbol_info(sym_id, name, kind))
+                    return std::string(symbol_kind_name(kind));
+                return "Class";
+            };
+
+            if(direction == "supertypes" || direction == "both") {
+                for(auto& item: srv.indexer.find_supertypes(rs.hash)) {
+                    auto sid = extract_symbol_id(item.data);
+                    result.supertypes.push_back(TypeHierarchyEntry{
+                        .name = item.name,
+                        .kind = resolve_kind(sid),
+                        .file = uri_to_path(item.uri),
+                        .line = static_cast<int>(item.range.start.line) + 1,
+                        .symbol_id = sid,
+                    });
+                }
+            }
+
+            if(direction == "subtypes" || direction == "both") {
+                for(auto& item: srv.indexer.find_subtypes(rs.hash)) {
+                    auto sid = extract_symbol_id(item.data);
+                    result.subtypes.push_back(TypeHierarchyEntry{
+                        .name = item.name,
+                        .kind = resolve_kind(sid),
+                        .file = uri_to_path(item.uri),
+                        .line = static_cast<int>(item.range.start.line) + 1,
+                        .symbol_id = sid,
+                    });
+                }
+            }
+
+            co_return result;
+        });
+
+    peer.on_request([&srv](RequestContext&, const LintParams& params) -> RequestResult<LintParams> {
+        std::string directory;
+        std::vector<std::string> arguments;
+        if(!srv.compiler.fill_compile_args(params.path, directory, arguments)) {
+            co_return kota::outcome_error(
+                kota::ipc::Error{std::format("no compile command found for {}", params.path)});
+        }
+
+        auto result = co_await kota::queue([path = params.path,
+                                            directory = std::move(directory),
+                                            arguments = std::move(arguments)]() mutable {
+            CompilationParams cp;
+            cp.kind = CompilationKind::Content;
+            cp.clang_tidy = true;
+            cp.directory = std::move(directory);
+            for(auto& arg: arguments) {
+                cp.arguments.push_back(arg.c_str());
+            }
+
+            auto unit = compile(cp);
+            if(!unit.completed() && !unit.fatal_error()) {
+                LOG_WARN("Lint compilation failed: {}", path);
+                return LintResult{};
+            }
+
+            return feature::diagnostics(unit);
+        });
+        co_return result.value();
+    });
+
+    peer.on_request([&srv](RequestContext&, const StatusParams&) -> RequestResult<StatusParams> {
+        StatusResult result;
+        result.idle = srv.indexer.is_idle();
+        result.pending = static_cast<int>(srv.indexer.pending_files());
+        result.total = static_cast<int>(srv.indexer.total_queued());
+        result.indexed = std::max(0, result.total - result.pending);
+        co_return result;
+    });
+
+    peer.on_notification([&srv](const ShutdownParams&) {
+        LOG_INFO("agentic/shutdown received, shutting down");
+        srv.schedule_shutdown();
+    });
+}
+
+}  // namespace clice

src/server/service/agent_client.h

@@ -0,0 +1,18 @@
+#pragma once
+
+#include "kota/ipc/codec/json.h"
+
+namespace clice {
+
+class MasterServer;
+
+class AgentClient {
+public:
+    AgentClient(MasterServer& server, kota::ipc::JsonPeer& peer);
+
+private:
+    MasterServer& server;
+    kota::ipc::JsonPeer& peer;
+};
+
+}  // namespace clice

src/server/service/agentic.cpp

@@ -0,0 +1,180 @@
+#include "server/service/agentic.h"
+
+#include <memory>
+#include <print>
+#include <string>
+
+#include "server/protocol/agentic.h"
+#include "support/filesystem.h"
+#include "support/logging.h"
+
+#include "kota/async/async.h"
+#include "kota/ipc/codec/json.h"
+#include "kota/ipc/transport.h"
+
+namespace clice {
+
+template <typename Params>
+static kota::task<bool> send_and_print(kota::ipc::JsonPeer& peer, Params params) {
+    auto result = co_await peer.send_request(std::move(params));
+    if(!result) {
+        LOG_ERROR("request failed: {}", result.error().message);
+        co_return false;
+    }
+    auto json = kota::codec::json::to_string<kota::ipc::lsp_config>(*result);
+    std::println("{}", json ? *json : "null");
+    co_return true;
+}
+
+static kota::task<> agentic_request(kota::ipc::JsonPeer& peer,
+                                    int& exit_code,
+                                    const AgenticQueryOptions& opts) {
+    bool ok = false;
+
+    if(opts.method == "compileCommand") {
+        ok = co_await send_and_print(peer, agentic::CompileCommandParams{.path = opts.path});
+    } else if(opts.method == "projectFiles") {
+        auto filter = opts.query.empty() ? std::nullopt : std::optional(opts.query);
+        ok = co_await send_and_print(peer, agentic::ProjectFilesParams{.filter = filter});
+    } else if(opts.method == "symbolSearch") {
+        ok = co_await send_and_print(peer, agentic::SymbolSearchParams{.query = opts.query});
+    } else if(opts.method == "definition") {
+        auto name = opts.name.empty() ? std::nullopt : std::optional(opts.name);
+        auto path = opts.path.empty() ? std::nullopt : std::optional(opts.path);
+        auto line = opts.line > 0 ? std::optional(opts.line) : std::nullopt;
+        ok = co_await send_and_print(
+            peer,
+            agentic::DefinitionParams{.name = name, .path = path, .line = line});
+    } else if(opts.method == "references") {
+        auto name = opts.name.empty() ? std::nullopt : std::optional(opts.name);
+        auto path = opts.path.empty() ? std::nullopt : std::optional(opts.path);
+        auto line = opts.line > 0 ? std::optional(opts.line) : std::nullopt;
+        ok = co_await send_and_print(
+            peer,
+            agentic::ReferencesParams{.name = name, .path = path, .line = line});
+    } else if(opts.method == "readSymbol") {
+        auto name = opts.name.empty() ? std::nullopt : std::optional(opts.name);
+        auto path = opts.path.empty() ? std::nullopt : std::optional(opts.path);
+        auto line = opts.line > 0 ? std::optional(opts.line) : std::nullopt;
+        ok = co_await send_and_print(
+            peer,
+            agentic::ReadSymbolParams{.name = name, .path = path, .line = line});
+    } else if(opts.method == "documentSymbols") {
+        ok = co_await send_and_print(peer, agentic::DocumentSymbolsParams{.path = opts.path});
+    } else if(opts.method == "callGraph") {
+        auto name = opts.name.empty() ? std::nullopt : std::optional(opts.name);
+        auto path = opts.path.empty() ? std::nullopt : std::optional(opts.path);
+        auto line = opts.line > 0 ? std::optional(opts.line) : std::nullopt;
+        auto dir = opts.direction.empty() ? std::nullopt : std::optional(opts.direction);
+        ok = co_await send_and_print(peer,
+                                     agentic::CallGraphParams{
+                                         .name = name,
+                                         .path = path,
+                                         .line = line,
+                                         .direction = dir,
+                                     });
+    } else if(opts.method == "typeHierarchy") {
+        auto name = opts.name.empty() ? std::nullopt : std::optional(opts.name);
+        auto path = opts.path.empty() ? std::nullopt : std::optional(opts.path);
+        auto line = opts.line > 0 ? std::optional(opts.line) : std::nullopt;
+        auto dir = opts.direction.empty() ? std::nullopt : std::optional(opts.direction);
+        ok = co_await send_and_print(peer,
+                                     agentic::TypeHierarchyParams{
+                                         .name = name,
+                                         .path = path,
+                                         .line = line,
+                                         .direction = dir,
+                                     });
+    } else if(opts.method == "lint") {
+        auto line = opts.line > 0 ? std::optional(opts.line) : std::nullopt;
+        ok = co_await send_and_print(peer, agentic::LintParams{.path = opts.path, .line = line});
+    } else if(opts.method == "fileDeps") {
+        auto dir = opts.direction.empty() ? std::nullopt : std::optional(opts.direction);
+        ok = co_await send_and_print(peer,
+                                     agentic::FileDepsParams{.path = opts.path, .direction = dir});
+    } else if(opts.method == "impactAnalysis") {
+        ok = co_await send_and_print(peer, agentic::ImpactAnalysisParams{.path = opts.path});
+    } else if(opts.method == "status") {
+        ok = co_await send_and_print(peer, agentic::StatusParams{});
+    } else if(opts.method == "shutdown") {
+        peer.send_notification(agentic::ShutdownParams{});
+        ok = true;
+    } else {
+        LOG_ERROR("unknown agentic method '{}'", opts.method);
+    }
+
+    if(ok)
+        exit_code = 0;
+    peer.close();
+}
+
+static kota::task<> agentic_client(int& exit_code,
+                                   std::unique_ptr<kota::ipc::JsonPeer>& peer_out,
+                                   const AgenticQueryOptions& opts) {
+    auto& loop = kota::event_loop::current();
+    auto transport = co_await kota::ipc::StreamTransport::connect_tcp(opts.host, opts.port, loop);
+    if(!transport) {
+        LOG_ERROR("failed to connect to {}:{}", opts.host, opts.port);
+        co_return;
+    }
+
+    peer_out = std::make_unique<kota::ipc::JsonPeer>(loop, std::move(*transport));
+    co_await kota::when_all(peer_out->run(), agentic_request(*peer_out, exit_code, opts));
+}
+
+int run_agentic_mode(const AgenticQueryOptions& opts) {
+    logging::stderr_logger("agentic", logging::options);
+
+    kota::event_loop loop;
+    int exit_code = 1;
+    std::unique_ptr<kota::ipc::JsonPeer> peer;
+    loop.schedule(agentic_client(exit_code, peer, opts));
+    loop.run();
+    return exit_code;
+}
+
+static kota::task<> relay_forward(kota::ipc::Transport& from, kota::ipc::Transport& to) {
+    while(true) {
+        auto msg = co_await from.read_message();
+        if(!msg)
+            break;
+        co_await to.write_message(*msg);
+    }
+    to.close();
+}
+
+static kota::task<> relay_main(kota::event_loop& loop, int& exit_code, std::string socket_path) {
+    auto stdio = kota::ipc::StreamTransport::open_stdio(loop);
+    if(!stdio) {
+        LOG_ERROR("failed to open stdio transport");
+        loop.stop();
+        co_return;
+    }
+
+    auto conn = co_await kota::pipe::connect(socket_path, {}, loop);
+    if(!conn) {
+        LOG_ERROR("failed to connect to {}", socket_path);
+        loop.stop();
+        co_return;
+    }
+
+    auto socket = std::make_unique<kota::ipc::StreamTransport>(std::move(*conn));
+
+    co_await kota::when_all(relay_forward(**stdio, *socket), relay_forward(*socket, **stdio));
+    exit_code = 0;
+    loop.stop();
+}
+
+int run_relay_mode(llvm::StringRef socket_path) {
+    logging::stderr_logger("relay", logging::options);
+
+    auto path = socket_path.empty() ? path::default_socket_path() : socket_path.str();
+
+    kota::event_loop loop;
+    int exit_code = 1;
+    loop.schedule(relay_main(loop, exit_code, std::move(path)));
+    loop.run();
+    return exit_code;
+}
+
+}  // namespace clice

src/server/service/agentic.h

@@ -0,0 +1,24 @@
+#pragma once
+
+#include <string>
+
+#include "llvm/ADT/StringRef.h"
+
+namespace clice {
+
+struct AgenticQueryOptions {
+    std::string host;
+    int port = 0;
+    std::string method;
+    std::string path;
+    std::string name;
+    std::string query;
+    int line = 0;
+    std::string direction;
+};
+
+int run_agentic_mode(const AgenticQueryOptions& opts);
+
+int run_relay_mode(llvm::StringRef socket_path);
+
+}  // namespace clice

src/server/service/lsp_client.cpp

@@ -1,4 +1,4 @@
-#include "server/master_server.h"
+#include "server/service/lsp_client.h"
 
 #include <algorithm>
 #include <format>
@@ -7,7 +7,9 @@
 #include <variant>
 
 #include "semantic/symbol_kind.h"
-#include "server/protocol.h"
+#include "server/protocol/extension.h"
+#include "server/protocol/worker.h"
+#include "server/service/master_server.h"
 #include "support/filesystem.h"
 #include "support/logging.h"
 
@@ -16,7 +18,6 @@
 #include "kota/ipc/lsp/protocol.h"
 #include "kota/ipc/lsp/uri.h"
 #include "kota/meta/enum.h"
-#include "llvm/Support/FileSystem.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/Process.h"
 
@@ -29,143 +30,39 @@ using kota::ipc::RequestResult;
 using RequestContext = kota::ipc::JsonPeer::RequestContext;
 using serde_raw = kota::codec::RawValue;
 
-/// Serialize a value to a JSON RawValue using LSP config.
 template <typename T>
 static serde_raw to_raw(const T& value) {
     auto json = kota::codec::json::to_json<kota::ipc::lsp_config>(value);
     return serde_raw{json ? std::move(*json) : "null"};
 }
 
-MasterServer::MasterServer(kota::event_loop& loop,
-                           kota::ipc::JsonPeer& peer,
-                           std::string self_path) :
-    loop(loop), peer(peer), pool(loop), compiler(loop, peer, workspace, pool, sessions),
-    indexer(loop,
-            workspace,
-            sessions,
-            pool,
-            compiler,
-            [this](uint32_t proj_path_id) {
-                // Bridge project-level path_id to server-level path_id.
-                // The two PathPools may assign different IDs to the same path.
-                auto path = workspace.project_index.path_pool.path(proj_path_id);
-                auto server_id = workspace.path_pool.intern(path);
-                return sessions.contains(server_id);
-            }),
-    self_path(std::move(self_path)) {}
+LSPClient::LSPClient(MasterServer& server, kota::ipc::JsonPeer& peer) : server(server), peer(peer) {
+    server.compiler.set_peer(&peer);
+    server.indexer.set_peer(&peer);
 
-MasterServer::~MasterServer() = default;
-
-kota::task<> MasterServer::load_workspace() {
-    if(workspace_root.empty())
-        co_return;
-
-    if(!workspace.config.cache_dir.empty()) {
-        auto ec = llvm::sys::fs::create_directories(workspace.config.cache_dir);
-        if(ec) {
-            LOG_WARN("Failed to create cache directory {}: {}",
-                     workspace.config.cache_dir,
-                     ec.message());
-        } else {
-            LOG_INFO("Cache directory: {}", workspace.config.cache_dir);
-        }
-
-        for(auto* subdir: {"cache/pch", "cache/pcm"}) {
-            auto dir = path::join(workspace.config.cache_dir, subdir);
-            auto ec2 = llvm::sys::fs::create_directories(dir);
-            if(ec2) {
-                LOG_WARN("Failed to create {}: {}", dir, ec2.message());
-            }
-        }
-
-        // Clean up stale files first, then load — load_cache() only restores
-        // entries still listed in cache.json, so cleanup won't delete live files.
-        workspace.cleanup_cache();
-        workspace.load_cache();
-    }
-
-    std::string cdb_path;
-    if(!workspace.config.compile_commands_path.empty()) {
-        if(llvm::sys::fs::exists(workspace.config.compile_commands_path)) {
-            cdb_path = workspace.config.compile_commands_path;
-        } else {
-            LOG_WARN("Configured compile_commands_path not found: {}",
-                     workspace.config.compile_commands_path);
-        }
-    }
-
-    if(cdb_path.empty()) {
-        for(auto* subdir: {"build", "cmake-build-debug", "cmake-build-release", "out", "."}) {
-            auto candidate = path::join(workspace_root, subdir, "compile_commands.json");
-            if(llvm::sys::fs::exists(candidate)) {
-                cdb_path = std::move(candidate);
-                break;
-            }
-        }
-    }
-
-    if(cdb_path.empty()) {
-        LOG_WARN("No compile_commands.json found in workspace {}", workspace_root);
-        co_return;
-    }
-
-    auto count = workspace.cdb.load(cdb_path);
-    LOG_INFO("Loaded CDB from {} with {} entries", cdb_path, count);
-
-    auto report = scan_dependency_graph(workspace.cdb, workspace.path_pool, workspace.dep_graph);
-    workspace.dep_graph.build_reverse_map();
-
-    auto unresolved = report.includes_found - report.includes_resolved;
-    double accuracy =
-        report.includes_found > 0
-            ? 100.0 * static_cast<double>(report.includes_resolved) / report.includes_found
-            : 100.0;
-    LOG_INFO(
-        "Dependency scan: {}ms, {} files ({} source + {} header), " "{} edges, {}/{} resolved ({:.1f}%), {} waves",
-        report.elapsed_ms,
-        report.total_files,
-        report.source_files,
-        report.header_files,
-        report.total_edges,
-        report.includes_resolved,
-        report.includes_found,
-        accuracy,
-        report.waves);
-    if(unresolved > 0) {
-        LOG_WARN("{} unresolved includes", unresolved);
-    }
-
-    workspace.build_module_map();
-    indexer.load(workspace.config.index_dir);
-
-    if(workspace.config.enable_indexing) {
-        for(auto& entry: workspace.cdb.get_entries()) {
-            auto file = workspace.cdb.resolve_path(entry.file);
-            auto server_id = workspace.path_pool.intern(file);
-            indexer.enqueue(server_id);
-        }
-        indexer.schedule();
-    }
-
-    compiler.init_compile_graph();
-}
-
-void MasterServer::register_handlers() {
     using StringVec = std::vector<std::string>;
 
     peer.on_request([this](RequestContext& ctx, const protocol::InitializeParams& params)
                         -> RequestResult<protocol::InitializeParams> {
-        if(lifecycle != ServerLifecycle::Uninitialized) {
+        auto& srv = this->server;
+        if(srv.lifecycle != ServerLifecycle::Uninitialized) {
             co_return kota::outcome_error(protocol::Error{"Server already initialized"});
         }
 
         auto& init = params.lsp__initialize_params;
         if(init.root_uri.has_value()) {
-            workspace_root = uri_to_path(*init.root_uri);
+            srv.workspace_root = uri_to_path(*init.root_uri);
         }
 
-        lifecycle = ServerLifecycle::Initialized;
-        LOG_INFO("Initialized with workspace: {}", workspace_root);
+        if(init.initialization_options.has_value()) {
+            auto json =
+                kota::codec::json::to_json<kota::ipc::lsp_config>(*init.initialization_options);
+            if(json)
+                srv.init_options_json = std::move(*json);
+        }
+
+        srv.lifecycle = ServerLifecycle::Initialized;
+        LOG_INFO("Initialized with workspace: {}", srv.workspace_root);
 
         protocol::InitializeResult result;
         auto& caps = result.capabilities;
@@ -188,7 +85,6 @@ void MasterServer::register_handlers() {
         caps.signature_help_provider = protocol::SignatureHelpOptions{
             .trigger_characters = StringVec{"(", ")", "{", "}", "<", ">", ","},
         };
-        /// FIXME: In the future, we would support work done progress.
         caps.declaration_provider = protocol::DeclarationOptions{
             .work_done_progress = false,
         };
@@ -212,6 +108,8 @@ void MasterServer::register_handlers() {
         caps.call_hierarchy_provider = true;
         caps.type_hierarchy_provider = true;
         caps.workspace_symbol_provider = true;
+        caps.document_formatting_provider = true;
+        caps.document_range_formatting_provider = true;
 
         protocol::SemanticTokensOptions sem_opts;
         {
@@ -243,80 +141,32 @@ void MasterServer::register_handlers() {
         co_return result;
     });
 
-    peer.on_notification([this](const protocol::InitializedParams& params) {
-        workspace.config = CliceConfig::load_from_workspace(workspace_root);
-
-        if(!workspace.config.logging_dir.empty()) {
-            auto now = std::chrono::system_clock::now();
-            auto pid = llvm::sys::Process::getProcessId();
-            auto session_dir = path::join(workspace.config.logging_dir,
-                                          std::format("{:%Y-%m-%d_%H-%M-%S}_{}", now, pid));
-            logging::file_logger("master", session_dir, logging::options);
-            session_log_dir = session_dir;
-        }
-
-        LOG_INFO("Server ready (stateful={}, stateless={}, idle={}ms)",
-                 workspace.config.stateful_worker_count,
-                 workspace.config.stateless_worker_count,
-                 workspace.config.idle_timeout_ms);
-
-        WorkerPoolOptions pool_opts;
-        pool_opts.self_path = self_path;
-        pool_opts.stateful_count = workspace.config.stateful_worker_count;
-        pool_opts.stateless_count = workspace.config.stateless_worker_count;
-        pool_opts.worker_memory_limit = workspace.config.worker_memory_limit;
-        pool_opts.log_dir = session_log_dir;
-        if(!pool.start(pool_opts)) {
-            LOG_ERROR("Failed to start worker pool");
-            return;
-        }
-
-        lifecycle = ServerLifecycle::Ready;
-
-        compiler.on_indexing_needed = [this]() {
-            indexer.schedule();
-        };
-
-        loop.schedule(load_workspace());
+    peer.on_notification([this]([[maybe_unused]] const protocol::InitializedParams& params) {
+        this->server.initialize();
     });
 
     peer.on_request(
         [this](RequestContext& ctx,
                const protocol::ShutdownParams& params) -> RequestResult<protocol::ShutdownParams> {
-            lifecycle = ServerLifecycle::ShuttingDown;
+            this->server.lifecycle = ServerLifecycle::ShuttingDown;
             LOG_INFO("Shutdown requested");
             co_return nullptr;
         });
 
-    peer.on_notification([this](const protocol::ExitParams& params) {
-        lifecycle = ServerLifecycle::Exited;
+    peer.on_notification([this]([[maybe_unused]] const protocol::ExitParams& params) {
         LOG_INFO("Exit notification received");
-
-        indexer.save(workspace.config.index_dir);
-        workspace.save_cache();
-
-        loop.schedule([this]() -> kota::task<> {
-            co_await pool.stop();
-            loop.stop();
-        }());
+        this->server.schedule_shutdown();
     });
 
-    /// Document lifecycle — handled directly by MasterServer.
-
     peer.on_notification([this](const protocol::DidOpenTextDocumentParams& params) {
-        if(lifecycle != ServerLifecycle::Ready)
+        auto& srv = this->server;
+        if(srv.lifecycle != ServerLifecycle::Ready)
             return;
 
         auto path = uri_to_path(params.text_document.uri);
-        auto path_id = workspace.path_pool.intern(path);
+        auto path_id = srv.workspace.path_pool.intern(path);
 
-        auto [it, inserted] = sessions.try_emplace(path_id);
-        auto& session = it->second;
-        if(!inserted) {
-            // DenseMap tombstone may retain stale data — reset to a fresh Session.
-            session = Session{};
-        }
-        session.path_id = path_id;
+        auto& session = srv.open_session(path_id);
         session.version = params.text_document.version;
         session.text = params.text_document.text;
         session.generation++;
@@ -325,18 +175,18 @@ void MasterServer::register_handlers() {
     });
 
     peer.on_notification([this](const protocol::DidChangeTextDocumentParams& params) {
-        if(lifecycle != ServerLifecycle::Ready)
+        auto& srv = this->server;
+        if(srv.lifecycle != ServerLifecycle::Ready)
             return;
 
         auto path = uri_to_path(params.text_document.uri);
-        auto path_id = workspace.path_pool.intern(path);
+        auto path_id = srv.workspace.path_pool.intern(path);
 
-        auto it = sessions.find(path_id);
-        if(it == sessions.end())
+        auto* session = srv.find_session(path_id);
+        if(!session)
             return;
 
-        auto& session = it->second;
-        session.version = params.text_document.version;
+        session->version = params.text_document.version;
 
         for(auto& change: params.content_changes) {
             std::visit(
@@ -344,186 +194,157 @@ void MasterServer::register_handlers() {
                     using T = std::remove_cvref_t<decltype(c)>;
                     if constexpr(std::is_same_v<T,
                                                 protocol::TextDocumentContentChangeWholeDocument>) {
-                        session.text = c.text;
+                        session->text = c.text;
                     } else {
                         auto& range = c.range;
-                        lsp::PositionMapper mapper(session.text, lsp::PositionEncoding::UTF16);
+                        lsp::PositionMapper mapper(session->text, lsp::PositionEncoding::UTF16);
                         auto start = mapper.to_offset(range.start);
                         auto end = mapper.to_offset(range.end);
                         if(start && end && *start <= *end) {
-                            session.text.replace(*start, *end - *start, c.text);
+                            session->text.replace(*start, *end - *start, c.text);
                         }
                     }
                 },
                 change);
         }
 
-        session.generation++;
-        session.ast_dirty = true;
+        session->generation++;
+        session->ast_dirty = true;
 
         LOG_DEBUG("didChange: path={} version={} gen={}",
                   path,
-                  session.version,
-                  session.generation);
+                  session->version,
+                  session->generation);
 
         worker::DocumentUpdateParams update;
         update.path = path;
-        update.version = session.version;
-        pool.notify_stateful(path_id, update);
+        update.version = session->version;
+        srv.pool.notify_stateful(path_id, update);
     });
 
     peer.on_notification([this](const protocol::DidCloseTextDocumentParams& params) {
-        if(lifecycle != ServerLifecycle::Ready)
+        auto& srv = this->server;
+        if(srv.lifecycle != ServerLifecycle::Ready)
             return;
 
-        auto path = uri_to_path(params.text_document.uri);
-        auto path_id = workspace.path_pool.intern(path);
-
-        workspace.on_file_closed(path_id);
-        pool.notify_stateful(path_id, worker::EvictParams{path});
-
-        // Clear diagnostics for the closed file.
-        protocol::PublishDiagnosticsParams diag_params;
-        diag_params.uri = params.text_document.uri;
-        peer.send_notification(diag_params);
-
-        sessions.erase(path_id);
-
-        indexer.enqueue(path_id);
-        indexer.schedule();
-
-        LOG_DEBUG("didClose: {}", path);
+        auto path_id = srv.workspace.path_pool.intern(uri_to_path(params.text_document.uri));
+        srv.close_session(path_id, this->peer);
     });
 
     peer.on_notification([this](const protocol::DidSaveTextDocumentParams& params) {
-        if(lifecycle != ServerLifecycle::Ready)
+        auto& srv = this->server;
+        if(srv.lifecycle != ServerLifecycle::Ready)
             return;
 
         auto path = uri_to_path(params.text_document.uri);
-        auto path_id = workspace.path_pool.intern(path);
-
-        auto dirtied = workspace.on_file_saved(path_id);
-        for(auto dirty_id: dirtied) {
-            if(auto sit = sessions.find(dirty_id); sit != sessions.end()) {
-                sit->second.ast_dirty = true;
-            } else {
-                indexer.enqueue(dirty_id);
-            }
-        }
-
-        // Invalidate header contexts for sessions whose host is this file.
-        for(auto& [hdr_id, session]: sessions) {
-            if(session.header_context && session.header_context->host_path_id == path_id) {
-                session.header_context.reset();
-                session.ast_dirty = true;
-            }
-        }
-
-        indexer.schedule();
+        auto path_id = srv.workspace.path_pool.intern(path);
+        srv.on_file_saved(path_id);
 
         LOG_DEBUG("didSave: {}", path);
     });
 
-    /// Feature requests — stateful forwarding.
-
     peer.on_request([this](RequestContext& ctx, const protocol::HoverParams& params) -> RawResult {
+        auto& srv = this->server;
         auto path = uri_to_path(params.text_document_position_params.text_document.uri);
-        auto path_id = workspace.path_pool.intern(path);
-        auto sit = sessions.find(path_id);
-        if(sit == sessions.end())
+        auto path_id = srv.workspace.path_pool.intern(path);
+        auto* session = srv.find_session(path_id);
+        if(!session)
             co_return serde_raw{"null"};
-        co_return co_await compiler.forward_query(worker::QueryKind::Hover,
-                                                  sit->second,
-                                                  params.text_document_position_params.position);
+        co_return co_await srv.compiler.forward_query(
+            worker::QueryKind::Hover,
+            *session,
+            params.text_document_position_params.position);
     });
 
     peer.on_request([this](RequestContext& ctx,
                            const protocol::SemanticTokensParams& params) -> RawResult {
+        auto& srv = this->server;
         auto path = uri_to_path(params.text_document.uri);
-        auto path_id = workspace.path_pool.intern(path);
-        auto sit = sessions.find(path_id);
-        if(sit == sessions.end())
+        auto path_id = srv.workspace.path_pool.intern(path);
+        auto* session = srv.find_session(path_id);
+        if(!session)
             co_return serde_raw{"null"};
-        co_return co_await compiler.forward_query(worker::QueryKind::SemanticTokens, sit->second);
+        co_return co_await srv.compiler.forward_query(worker::QueryKind::SemanticTokens, *session);
     });
 
     peer.on_request(
         [this](RequestContext& ctx, const protocol::InlayHintParams& params) -> RawResult {
+            auto& srv = this->server;
             auto path = uri_to_path(params.text_document.uri);
-            auto path_id = workspace.path_pool.intern(path);
-            auto sit = sessions.find(path_id);
-            if(sit == sessions.end())
+            auto path_id = srv.workspace.path_pool.intern(path);
+            auto* session = srv.find_session(path_id);
+            if(!session)
                 co_return serde_raw{"null"};
-            co_return co_await compiler.forward_query(worker::QueryKind::InlayHints,
-                                                      sit->second,
-                                                      {},
-                                                      params.range);
+            co_return co_await srv.compiler.forward_query(worker::QueryKind::InlayHints,
+                                                          *session,
+                                                          {},
+                                                          params.range);
         });
 
-    peer.on_request(
-        [this](RequestContext& ctx, const protocol::FoldingRangeParams& params) -> RawResult {
-            auto path = uri_to_path(params.text_document.uri);
-            auto path_id = workspace.path_pool.intern(path);
-            auto sit = sessions.find(path_id);
-            if(sit == sessions.end())
-                co_return serde_raw{"null"};
-            co_return co_await compiler.forward_query(worker::QueryKind::FoldingRange, sit->second);
-        });
+    peer.on_request([this](RequestContext& ctx,
+                           const protocol::FoldingRangeParams& params) -> RawResult {
+        auto& srv = this->server;
+        auto path = uri_to_path(params.text_document.uri);
+        auto path_id = srv.workspace.path_pool.intern(path);
+        auto* session = srv.find_session(path_id);
+        if(!session)
+            co_return serde_raw{"null"};
+        co_return co_await srv.compiler.forward_query(worker::QueryKind::FoldingRange, *session);
+    });
 
     peer.on_request([this](RequestContext& ctx,
                            const protocol::DocumentSymbolParams& params) -> RawResult {
+        auto& srv = this->server;
         auto path = uri_to_path(params.text_document.uri);
-        auto path_id = workspace.path_pool.intern(path);
-        auto sit = sessions.find(path_id);
-        if(sit == sessions.end())
+        auto path_id = srv.workspace.path_pool.intern(path);
+        auto* session = srv.find_session(path_id);
+        if(!session)
             co_return serde_raw{"null"};
-        co_return co_await compiler.forward_query(worker::QueryKind::DocumentSymbol, sit->second);
-    });
-
-    peer.on_request([this](RequestContext& ctx,
-                           const protocol::DocumentLinkParams& params) -> RawResult {
-        auto path = uri_to_path(params.text_document.uri);
-        auto path_id = workspace.path_pool.intern(path);
-        auto sit = sessions.find(path_id);
-        if(sit == sessions.end())
-            co_return serde_raw{"null"};
-        auto& session = sit->second;
-        auto result = co_await compiler.forward_query(worker::QueryKind::DocumentLink, session);
-        if(!result.has_value())
-            co_return serde_raw{"null"};
-        // Merge document links from PCH if available.
-        auto& links = result.value();
-        // Re-lookup session after co_await since iterators may be invalidated.
-        auto sit2 = sessions.find(path_id);
-        if(sit2 != sessions.end() && sit2->second.pch_ref) {
-            auto pch_it = workspace.pch_cache.find(sit2->second.pch_ref->path_id);
-            if(pch_it != workspace.pch_cache.end() && !pch_it->second.document_links_json.empty()) {
-                auto& pch_json = pch_it->second.document_links_json;
-                // Merge two JSON arrays.
-                if(!links.data.empty() && links.data != "null" && links.data.size() > 2) {
-                    // "[a,b]" + "[c,d]" -> "[a,b,c,d]"
-                    links.data.pop_back();  // remove trailing ']'
-                    links.data += ',';
-                    links.data.append(pch_json.begin() + 1, pch_json.end());  // skip '['
-                } else {
-                    links.data = pch_json;
-                }
-            }
-        }
-        co_return std::move(links);
+        co_return co_await srv.compiler.forward_query(worker::QueryKind::DocumentSymbol, *session);
     });
 
     peer.on_request(
-        [this](RequestContext& ctx, const protocol::CodeActionParams& params) -> RawResult {
+        [this](RequestContext& ctx, const protocol::DocumentLinkParams& params) -> RawResult {
+            auto& srv = this->server;
             auto path = uri_to_path(params.text_document.uri);
-            auto path_id = workspace.path_pool.intern(path);
-            auto sit = sessions.find(path_id);
-            if(sit == sessions.end())
+            auto path_id = srv.workspace.path_pool.intern(path);
+            auto* session = srv.find_session(path_id);
+            if(!session)
                 co_return serde_raw{"null"};
-            co_return co_await compiler.forward_query(worker::QueryKind::CodeAction, sit->second);
+            auto result =
+                co_await srv.compiler.forward_query(worker::QueryKind::DocumentLink, *session);
+            if(!result.has_value())
+                co_return serde_raw{"null"};
+            auto& links = result.value();
+            auto* session2 = srv.find_session(path_id);
+            if(session2 && session2->pch_ref) {
+                auto& pch_cache = srv.workspace.pch_cache;
+                auto pch_it = pch_cache.find(session2->pch_ref->path_id);
+                if(pch_it != pch_cache.end() && !pch_it->second.document_links_json.empty()) {
+                    auto& pch_json = pch_it->second.document_links_json;
+                    if(!links.data.empty() && links.data != "null" && links.data.size() > 2) {
+                        links.data.pop_back();
+                        links.data += ',';
+                        links.data.append(pch_json.begin() + 1, pch_json.end());
+                    } else {
+                        links.data = pch_json;
+                    }
+                }
+            }
+            co_return std::move(links);
+        });
+
+    peer.on_request(
+        [this](RequestContext& ctx, const protocol::CodeActionParams& params) -> RawResult {
+            auto& srv = this->server;
+            auto path = uri_to_path(params.text_document.uri);
+            auto path_id = srv.workspace.path_pool.intern(path);
+            auto* session = srv.find_session(path_id);
+            if(!session)
+                co_return serde_raw{"null"};
+            co_return co_await srv.compiler.forward_query(worker::QueryKind::CodeAction, *session);
         });
 
-    /// Helper: resolve URI to path, path_id, and Session pointer.
     auto resolve_uri = [this](const std::string& uri) {
         struct Result {
             std::string path;
@@ -531,22 +352,21 @@ void MasterServer::register_handlers() {
             Session* session;
         };
         auto path = uri_to_path(uri);
-        auto path_id = workspace.path_pool.intern(path);
-        auto sit = sessions.find(path_id);
-        Session* session = (sit != sessions.end()) ? &sit->second : nullptr;
+        auto path_id = this->server.workspace.path_pool.intern(path);
+        auto* session = this->server.find_session(path_id);
         return Result{std::move(path), path_id, session};
     };
 
     auto lookup_at = [this, resolve_uri](const std::string& uri, const protocol::Position& pos) {
         auto [path, path_id, session] = resolve_uri(uri);
-        return indexer.lookup_symbol(uri, path, pos, session);
+        return this->server.indexer.lookup_symbol(uri, path, pos, session);
     };
 
     auto query_at = [this, resolve_uri](const std::string& uri,
                                         const protocol::Position& pos,
                                         RelationKind kind) -> std::vector<protocol::Location> {
         auto [path, path_id, session] = resolve_uri(uri);
-        return indexer.query_relations(path, pos, kind, session);
+        return this->server.indexer.query_relations(path, pos, kind, session);
     };
 
     auto resolve_item =
@@ -555,11 +375,9 @@ void MasterServer::register_handlers() {
                       const protocol::Range& range,
                       const std::optional<protocol::LSPAny>& data) -> std::optional<SymbolInfo> {
         auto [path, path_id, session] = resolve_uri(uri);
-        return indexer.resolve_hierarchy_item(uri, path, range, data, session);
+        return this->server.indexer.resolve_hierarchy_item(uri, path, range, data, session);
     };
 
-    /// Feature requests — index-based with AST fallback.
-
     peer.on_request([this, query_at](RequestContext& ctx,
                                      const protocol::DefinitionParams& params) -> RawResult {
         auto& uri = params.text_document_position_params.text_document.uri;
@@ -570,14 +388,15 @@ void MasterServer::register_handlers() {
             co_return to_raw(result);
         }
 
+        auto& srv = this->server;
         auto path = uri_to_path(uri);
-        auto path_id = workspace.path_pool.intern(path);
-        auto sit = sessions.find(path_id);
-        if(sit == sessions.end())
+        auto path_id = srv.workspace.path_pool.intern(path);
+        auto* session = srv.find_session(path_id);
+        if(!session)
             co_return serde_raw{"null"};
-        co_return co_await compiler.forward_query(worker::QueryKind::GoToDefinition,
-                                                  sit->second,
-                                                  pos);
+        co_return co_await srv.compiler.forward_query(worker::QueryKind::GoToDefinition,
+                                                      *session,
+                                                      pos);
     });
 
     peer.on_request([this, query_at](RequestContext& ctx,
@@ -614,32 +433,60 @@ void MasterServer::register_handlers() {
             co_return serde_raw{"null"};
         });
 
-    /// Feature requests — stateless forwarding.
-
     peer.on_request([this](RequestContext& ctx,
                            const protocol::CompletionParams& params) -> RawResult {
+        auto& srv = this->server;
         auto path = uri_to_path(params.text_document_position_params.text_document.uri);
-        auto path_id = workspace.path_pool.intern(path);
-        auto sit = sessions.find(path_id);
-        if(sit == sessions.end())
+        auto path_id = srv.workspace.path_pool.intern(path);
+        auto* session = srv.find_session(path_id);
+        if(!session)
             co_return serde_raw{"null"};
-        co_return co_await compiler.handle_completion(params.text_document_position_params.position,
-                                                      sit->second);
+        auto pause = srv.indexer.scoped_pause();
+        auto result =
+            co_await srv.compiler.handle_completion(params.text_document_position_params.position,
+                                                    *session);
+        co_return std::move(result);
     });
 
     peer.on_request(
         [this](RequestContext& ctx, const protocol::SignatureHelpParams& params) -> RawResult {
+            auto& srv = this->server;
             auto path = uri_to_path(params.text_document_position_params.text_document.uri);
-            auto path_id = workspace.path_pool.intern(path);
-            auto sit = sessions.find(path_id);
-            if(sit == sessions.end())
+            auto path_id = srv.workspace.path_pool.intern(path);
+            auto* session = srv.find_session(path_id);
+            if(!session)
                 co_return serde_raw{"null"};
-            co_return co_await compiler.forward_build(worker::BuildKind::SignatureHelp,
-                                                      params.text_document_position_params.position,
-                                                      sit->second);
+            auto pause = srv.indexer.scoped_pause();
+            auto result =
+                co_await srv.compiler.forward_build(worker::BuildKind::SignatureHelp,
+                                                    params.text_document_position_params.position,
+                                                    *session);
+            co_return std::move(result);
         });
 
-    /// Hierarchy queries — index-based.
+    peer.on_request(
+        [this](RequestContext& ctx, const protocol::DocumentFormattingParams& params) -> RawResult {
+            auto& srv = this->server;
+            auto path = uri_to_path(params.text_document.uri);
+            auto path_id = srv.workspace.path_pool.intern(path);
+            auto* session = srv.find_session(path_id);
+            if(!session)
+                co_return serde_raw{"null"};
+            auto pause = srv.indexer.scoped_pause();
+            co_return co_await srv.compiler.forward_format(*session);
+        });
+
+    peer.on_request([this](RequestContext& ctx,
+                           const protocol::DocumentRangeFormattingParams& params) -> RawResult {
+        auto& srv = this->server;
+        auto path = uri_to_path(params.text_document.uri);
+        auto path_id = srv.workspace.path_pool.intern(path);
+        auto* session = srv.find_session(path_id);
+        if(!session)
+            co_return serde_raw{"null"};
+        auto pause = srv.indexer.scoped_pause();
+        co_return co_await srv.compiler.forward_format(*session, params.range);
+    });
 
     peer.on_request(
         [this, lookup_at](RequestContext& ctx,
@@ -664,7 +511,7 @@ void MasterServer::register_handlers() {
         auto info = resolve_item(params.item.uri, params.item.range, params.item.data);
         if(!info)
             co_return serde_raw{"null"};
-        auto results = indexer.find_incoming_calls(info->hash);
+        auto results = this->server.indexer.find_incoming_calls(info->hash);
         if(results.empty())
             co_return serde_raw{"null"};
         co_return to_raw(results);
@@ -676,7 +523,7 @@ void MasterServer::register_handlers() {
         auto info = resolve_item(params.item.uri, params.item.range, params.item.data);
         if(!info)
             co_return serde_raw{"null"};
-        auto results = indexer.find_outgoing_calls(info->hash);
+        auto results = this->server.indexer.find_outgoing_calls(info->hash);
         if(results.empty())
             co_return serde_raw{"null"};
         co_return to_raw(results);
@@ -706,7 +553,7 @@ void MasterServer::register_handlers() {
             auto info = resolve_item(params.item.uri, params.item.range, params.item.data);
             if(!info)
                 co_return serde_raw{"null"};
-            auto results = indexer.find_supertypes(info->hash);
+            auto results = this->server.indexer.find_supertypes(info->hash);
             if(results.empty())
                 co_return serde_raw{"null"};
             co_return to_raw(results);
@@ -718,7 +565,7 @@ void MasterServer::register_handlers() {
             auto info = resolve_item(params.item.uri, params.item.range, params.item.data);
             if(!info)
                 co_return serde_raw{"null"};
-            auto results = indexer.find_subtypes(info->hash);
+            auto results = this->server.indexer.find_subtypes(info->hash);
             if(results.empty())
                 co_return serde_raw{"null"};
             co_return to_raw(results);
@@ -726,29 +573,29 @@ void MasterServer::register_handlers() {
 
     peer.on_request(
         [this](RequestContext& ctx, const protocol::WorkspaceSymbolParams& params) -> RawResult {
-            auto results = indexer.search_symbols(params.query);
+            auto results = this->server.indexer.search_symbols(params.query);
             if(results.empty())
                 co_return serde_raw{"null"};
             co_return to_raw(results);
         });
 
-    /// clice/ extension commands.
-
     peer.on_request(
         "clice/queryContext",
         [this](RequestContext& ctx, const ext::QueryContextParams& params) -> RawResult {
+            auto& srv = this->server;
             auto path = uri_to_path(params.uri);
-            auto path_id = workspace.path_pool.intern(path);
+            auto path_id = srv.workspace.path_pool.intern(path);
             int offset_val = std::max(0, params.offset.value_or(0));
             constexpr int page_size = 10;
 
             ext::QueryContextResult result;
             std::vector<ext::ContextItem> all_items;
 
-            auto hosts = workspace.dep_graph.find_host_sources(path_id);
+            auto& ws = srv.workspace;
+            auto hosts = ws.dep_graph.find_host_sources(path_id);
             for(auto host_id: hosts) {
-                auto host_path = workspace.path_pool.resolve(host_id);
-                auto host_cdb = workspace.cdb.lookup(host_path, {.suppress_logging = true});
+                auto host_path = ws.path_pool.resolve(host_id);
+                auto host_cdb = ws.cdb.lookup(host_path, {.suppress_logging = true});
                 if(host_cdb.empty())
                     continue;
                 auto host_uri_opt = lsp::URI::from_file_path(std::string(host_path));
@@ -762,7 +609,7 @@ void MasterServer::register_handlers() {
             }
 
             if(hosts.empty()) {
-                auto entries = workspace.cdb.lookup(path, {.suppress_logging = true});
+                auto entries = ws.cdb.lookup(path, {.suppress_logging = true});
                 for(std::size_t i = 0; i < entries.size(); ++i) {
                     auto& cmd = entries[i];
                     auto argv = cmd.to_argv();
@@ -804,13 +651,14 @@ void MasterServer::register_handlers() {
     peer.on_request(
         "clice/currentContext",
         [this](RequestContext& ctx, const ext::CurrentContextParams& params) -> RawResult {
+            auto& srv = this->server;
             auto path = uri_to_path(params.uri);
-            auto path_id = workspace.path_pool.intern(path);
+            auto path_id = srv.workspace.path_pool.intern(path);
 
             ext::CurrentContextResult result;
-            auto sit = sessions.find(path_id);
-            if(sit != sessions.end() && sit->second.active_context) {
-                auto ctx_path = workspace.path_pool.resolve(*sit->second.active_context);
+            auto* session = srv.find_session(path_id);
+            if(session && session->active_context) {
+                auto ctx_path = srv.workspace.path_pool.resolve(*session->active_context);
                 auto ctx_uri_opt = lsp::URI::from_file_path(std::string(ctx_path));
                 if(ctx_uri_opt) {
                     ext::ContextItem item;
@@ -826,34 +674,41 @@ void MasterServer::register_handlers() {
     peer.on_request(
         "clice/switchContext",
         [this](RequestContext& ctx, const ext::SwitchContextParams& params) -> RawResult {
+            auto& srv = this->server;
             auto path = uri_to_path(params.uri);
-            auto path_id = workspace.path_pool.intern(path);
+            auto path_id = srv.workspace.path_pool.intern(path);
             auto context_path = uri_to_path(params.context_uri);
-            auto context_path_id = workspace.path_pool.intern(context_path);
+            auto context_path_id = srv.workspace.path_pool.intern(context_path);
 
             ext::SwitchContextResult result;
 
-            auto context_cdb = workspace.cdb.lookup(context_path, {.suppress_logging = true});
+            auto& ws = srv.workspace;
+            auto context_cdb = ws.cdb.lookup(context_path, {.suppress_logging = true});
             if(context_cdb.empty()) {
                 result.success = false;
                 co_return to_raw(result);
             }
 
-            auto sit = sessions.find(path_id);
-            if(sit == sessions.end()) {
+            auto* session = srv.find_session(path_id);
+            if(!session) {
                 result.success = false;
                 co_return to_raw(result);
             }
 
-            sit->second.active_context = context_path_id;
-            sit->second.header_context.reset();
-            sit->second.pch_ref.reset();
-            sit->second.ast_deps.reset();
-            sit->second.ast_dirty = true;
+            session->active_context = context_path_id;
+            session->header_context.reset();
+            session->pch_ref.reset();
+            session->ast_deps.reset();
+            session->ast_dirty = true;
 
             result.success = true;
             co_return to_raw(result);
         });
 }
 
+LSPClient::~LSPClient() {
+    server.compiler.set_peer(nullptr);
+    server.indexer.set_peer(nullptr);
+}
+
 }  // namespace clice

src/server/service/lsp_client.h

@@ -0,0 +1,23 @@
+#pragma once
+
+#include "kota/async/async.h"
+#include "kota/codec/json/json.h"
+#include "kota/ipc/codec/json.h"
+
+namespace clice {
+
+class MasterServer;
+
+class LSPClient {
+public:
+    LSPClient(MasterServer& server, kota::ipc::JsonPeer& peer);
+    ~LSPClient();
+
+private:
+    using RawResult = kota::task<kota::codec::RawValue, kota::ipc::Error>;
+
+    MasterServer& server;
+    kota::ipc::JsonPeer& peer;
+};
+
+}  // namespace clice

src/server/service/master_server.cpp

@@ -0,0 +1,551 @@
+#include "server/service/master_server.h"
+
+#include <cerrno>
+#include <cstring>
+#include <list>
+#include <memory>
+#include <string>
+#include <vector>
+
+#ifndef _WIN32
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <unistd.h>
+#endif
+
+#include "server/protocol/worker.h"
+#include "server/service/agent_client.h"
+#include "server/service/lsp_client.h"
+#include "support/filesystem.h"
+#include "support/logging.h"
+
+#include "kota/async/async.h"
+#include "kota/async/io/fs_event.h"
+#include "kota/codec/json/json.h"
+#include "kota/ipc/codec/json.h"
+#include "kota/ipc/lsp/protocol.h"
+#include "kota/ipc/lsp/uri.h"
+#include "kota/ipc/recording_transport.h"
+#include "kota/ipc/transport.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/Path.h"
+#include "llvm/Support/Process.h"
+
+namespace clice {
+
+namespace lsp = kota::ipc::lsp;
+namespace protocol = kota::ipc::protocol;
+
+MasterServer::MasterServer(kota::event_loop& loop, std::string self_path) :
+    loop(loop), pool(loop), compiler(loop, workspace, pool, sessions),
+    indexer(loop,
+            workspace,
+            sessions,
+            pool,
+            compiler,
+            [this](uint32_t proj_path_id) {
+                auto path = workspace.project_index.path_pool.path(proj_path_id);
+                auto server_id = workspace.path_pool.intern(path);
+                return sessions.contains(server_id);
+            }),
+    self_path(std::move(self_path)) {}
+
+MasterServer::~MasterServer() = default;
+
+void MasterServer::initialize() {
+    workspace.config = Config::load_from_workspace(workspace_root);
+    if(!init_options_json.empty()) {
+        if(auto ov = kota::codec::json::parse(init_options_json, workspace.config); !ov) {
+            LOG_WARN("Failed to apply initializationOptions: {}", ov.error().to_string());
+        } else {
+            workspace.config.apply_defaults(workspace_root);
+            LOG_INFO("Applied initializationOptions overlay");
+        }
+        init_options_json.clear();
+    }
+
+    auto& cfg = workspace.config.project;
+
+    if(!cfg.logging_dir.empty()) {
+        auto now = std::chrono::system_clock::now();
+        auto pid = llvm::sys::Process::getProcessId();
+        session_log_dir =
+            path::join(cfg.logging_dir, std::format("{:%Y-%m-%d_%H-%M-%S}_{}", now, pid));
+        logging::file_logger("master", session_log_dir, logging::options);
+    }
+
+    LOG_INFO("Server ready (stateful={}, stateless={}, idle={}ms)",
+             cfg.stateful_worker_count.value,
+             cfg.stateless_worker_count.value,
+             *cfg.idle_timeout_ms);
+
+    WorkerPoolOptions pool_opts;
+    pool_opts.self_path = self_path;
+    pool_opts.stateful_count = cfg.stateful_worker_count;
+    pool_opts.stateless_count = cfg.stateless_worker_count;
+    pool_opts.worker_memory_limit = cfg.worker_memory_limit;
+    pool_opts.log_dir = session_log_dir;
+    if(!pool.start(pool_opts)) {
+        LOG_ERROR("Failed to start worker pool");
+        return;
+    }
+
+    lifecycle = ServerLifecycle::Ready;
+
+    compiler.on_indexing_needed = [this]() {
+        indexer.schedule();
+    };
+
+    indexer.set_max_concurrency(cfg.stateless_worker_count.value);
+
+    load_workspace();
+}
+
+void MasterServer::initialize(llvm::StringRef root) {
+    workspace_root = root.str();
+    initialize();
+}
+
+void MasterServer::start_file_watcher() {
+    if(workspace_root.empty())
+        return;
+
+    loop.schedule([this]() -> kota::task<> {
+        auto watcher = kota::fs_event::create(workspace_root, {}, loop);
+        if(!watcher) {
+            LOG_WARN("Failed to start file watcher for {}", workspace_root);
+            co_return;
+        }
+
+        LOG_INFO("File watcher started for {}", workspace_root);
+
+        while(true) {
+            auto changes = co_await watcher->next();
+            if(!changes)
+                break;
+
+            for(auto& change: *changes) {
+                if(change.type != kota::fs_event::effect::modify &&
+                   change.type != kota::fs_event::effect::create)
+                    continue;
+
+                llvm::StringRef file(change.path);
+                if(file.ends_with("compile_commands.json")) {
+                    LOG_INFO("CDB changed, reloading workspace");
+                    load_workspace();
+                    continue;
+                }
+
+                if(file.ends_with(".cpp") || file.ends_with(".cc") || file.ends_with(".cxx") ||
+                   file.ends_with(".c") || file.ends_with(".h") || file.ends_with(".hpp") ||
+                   file.ends_with(".hxx") || file.ends_with(".cppm") || file.ends_with(".ixx")) {
+                    auto path_id = workspace.path_pool.intern(file);
+                    on_file_saved(path_id);
+                }
+            }
+        }
+    }());
+}
+
+Session* MasterServer::find_session(std::uint32_t path_id) {
+    auto it = sessions.find(path_id);
+    return it != sessions.end() ? &it->second : nullptr;
+}
+
+Session& MasterServer::open_session(std::uint32_t path_id) {
+    auto [it, inserted] = sessions.try_emplace(path_id);
+    auto& session = it->second;
+    if(!inserted)
+        session = Session{};
+    session.path_id = path_id;
+    return session;
+}
+
+void MasterServer::close_session(std::uint32_t path_id, kota::ipc::JsonPeer& peer) {
+    namespace protocol = kota::ipc::protocol;
+
+    auto path = workspace.path_pool.resolve(path_id);
+    workspace.on_file_closed(path_id);
+    pool.notify_stateful(path_id, worker::EvictParams{std::string(path)});
+
+    protocol::PublishDiagnosticsParams diag_params;
+    auto uri = lsp::URI::from_file_path(std::string(path));
+    if(uri)
+        diag_params.uri = uri->str();
+    diag_params.diagnostics = {};
+    peer.send_notification(diag_params);
+
+    sessions.erase(path_id);
+
+    indexer.enqueue(path_id);
+    indexer.schedule();
+
+    LOG_DEBUG("didClose: {}", path);
+}
+
+void MasterServer::on_file_saved(std::uint32_t path_id) {
+    auto dirtied = workspace.on_file_saved(path_id);
+    for(auto dirty_id: dirtied) {
+        if(auto* session = find_session(dirty_id)) {
+            session->ast_dirty = true;
+        } else {
+            indexer.enqueue(dirty_id);
+        }
+    }
+
+    for(auto& [hdr_id, session]: sessions) {
+        if(session.header_context && session.header_context->host_path_id == path_id) {
+            session.header_context.reset();
+            session.ast_dirty = true;
+        }
+    }
+
+    indexer.schedule();
+}
+
+void MasterServer::schedule_shutdown() {
+    if(lifecycle == ServerLifecycle::Exited)
+        return;
+    lifecycle = ServerLifecycle::Exited;
+
+    indexer.save(workspace.config.project.index_dir);
+    workspace.save_cache();
+    shutdown_event.set();
+
+    loop.schedule([this]() -> kota::task<> {
+        co_await kota::when_all(indexer.stop(), compiler.stop(), pool.stop());
+        loop.stop();
+    }());
+}
+
+void MasterServer::load_workspace() {
+    if(workspace_root.empty())
+        return;
+
+    auto& cfg = workspace.config.project;
+
+    if(!cfg.cache_dir.empty()) {
+        auto ec = llvm::sys::fs::create_directories(cfg.cache_dir);
+        if(ec) {
+            LOG_WARN("Failed to create cache directory {}: {}",
+                     std::string_view(cfg.cache_dir),
+                     ec.message());
+        } else {
+            LOG_INFO("Cache directory: {}", std::string_view(cfg.cache_dir));
+        }
+
+        for(auto* subdir: {"cache/pch", "cache/pcm"}) {
+            auto dir = path::join(cfg.cache_dir, subdir);
+            if(auto ec2 = llvm::sys::fs::create_directories(dir))
+                LOG_WARN("Failed to create {}: {}", dir, ec2.message());
+        }
+
+        workspace.cleanup_cache();
+        workspace.load_cache();
+    }
+
+    std::string cdb_path;
+    for(auto& configured: cfg.compile_commands_paths) {
+        if(llvm::sys::fs::is_directory(configured)) {
+            auto candidate = path::join(configured, "compile_commands.json");
+            if(llvm::sys::fs::exists(candidate)) {
+                cdb_path = std::move(candidate);
+                break;
+            }
+        } else if(llvm::sys::fs::exists(configured)) {
+            cdb_path = configured;
+            break;
+        } else {
+            LOG_WARN("Configured compile_commands_path not found: {}", configured);
+        }
+    }
+
+    if(cdb_path.empty()) {
+        auto try_candidate = [&](llvm::StringRef dir) -> bool {
+            auto candidate = path::join(dir, "compile_commands.json");
+            if(llvm::sys::fs::exists(candidate)) {
+                cdb_path = std::move(candidate);
+                return true;
+            }
+            return false;
+        };
+
+        if(!try_candidate(workspace_root)) {
+            std::error_code ec;
+            for(llvm::sys::fs::directory_iterator it(workspace_root, ec), end; it != end && !ec;
+                it.increment(ec)) {
+                if(it->type() == llvm::sys::fs::file_type::directory_file) {
+                    if(try_candidate(it->path()))
+                        break;
+                }
+            }
+        }
+    }
+
+    if(cdb_path.empty()) {
+        LOG_WARN("No compile_commands.json found in workspace {}", workspace_root);
+        return;
+    }
+
+    auto count = workspace.cdb.load(cdb_path);
+    LOG_INFO("Loaded CDB from {} with {} entries", cdb_path, count);
+
+    auto report = scan_dependency_graph(workspace.cdb,
+                                        workspace.path_pool,
+                                        workspace.dep_graph,
+                                        /*cache=*/nullptr,
+                                        [this](llvm::StringRef path,
+                                               std::vector<std::string>& append,
+                                               std::vector<std::string>& remove) {
+                                            workspace.config.match_rules(path, append, remove);
+                                        });
+    workspace.dep_graph.build_reverse_map();
+
+    auto unresolved = report.includes_found - report.includes_resolved;
+    double accuracy =
+        report.includes_found > 0
+            ? 100.0 * static_cast<double>(report.includes_resolved) / report.includes_found
+            : 100.0;
+    LOG_INFO(
+        "Dependency scan: {}ms, {} files ({} source + {} header), " "{} edges, {}/{} resolved ({:.1f}%), {} waves",
+        report.elapsed_ms,
+        report.total_files,
+        report.source_files,
+        report.header_files,
+        report.total_edges,
+        report.includes_resolved,
+        report.includes_found,
+        accuracy,
+        report.waves);
+    if(unresolved > 0)
+        LOG_WARN("{} unresolved includes", unresolved);
+
+    workspace.build_module_map();
+    indexer.load(cfg.index_dir);
+
+    if(*cfg.enable_indexing) {
+        for(auto& entry: workspace.cdb.get_entries()) {
+            auto file = workspace.cdb.resolve_path(entry.file);
+            auto server_id = workspace.path_pool.intern(file);
+            indexer.enqueue(server_id);
+        }
+        indexer.schedule();
+    }
+
+    compiler.init_compile_graph();
+}
+
+struct Connection {
+    std::unique_ptr<kota::ipc::JsonPeer> peer;
+    std::unique_ptr<LSPClient> lsp_client;
+    std::unique_ptr<AgentClient> agent_client;
+};
+
+static kota::task<> run_connection(kota::ipc::JsonPeer* peer,
+                                   std::list<Connection>& connections,
+                                   std::list<Connection>::iterator pos) {
+    co_await peer->run();
+    LOG_INFO("Client disconnected");
+    connections.erase(pos);
+}
+
+static kota::task<> accept_connections(MasterServer& server,
+                                       kota::tcp::acceptor acceptor,
+                                       bool register_lsp,
+                                       std::list<Connection>& connections) {
+    auto& loop = kota::event_loop::current();
+    kota::task_group<> connection_group(loop);
+    bool lsp_registered = false;
+
+    while(true) {
+        auto conn = co_await acceptor.accept();
+        if(!conn.has_value())
+            break;
+
+        LOG_INFO("Client connected");
+
+        auto transport = std::make_unique<kota::ipc::StreamTransport>(std::move(*conn));
+        auto peer = std::make_unique<kota::ipc::JsonPeer>(loop, std::move(transport));
+
+        std::unique_ptr<LSPClient> lsp;
+        if(register_lsp && !lsp_registered) {
+            lsp = std::make_unique<LSPClient>(server, *peer);
+            lsp_registered = true;
+        }
+        auto agent = std::make_unique<AgentClient>(server, *peer);
+
+        auto* peer_ptr = peer.get();
+        auto it = connections.emplace(connections.end(),
+                                      Connection{
+                                          .peer = std::move(peer),
+                                          .lsp_client = std::move(lsp),
+                                          .agent_client = std::move(agent),
+                                      });
+
+        connection_group.spawn(run_connection(peer_ptr, connections, it));
+    }
+
+    co_await connection_group.join();
+}
+
+int run_server_mode(const ServerOptions& opts) {
+    logging::stderr_logger("master", logging::options);
+
+    kota::event_loop loop;
+    MasterServer server(loop, opts.self_path);
+    std::list<Connection> connections;
+
+    if(opts.mode == "pipe") {
+        auto transport = kota::ipc::StreamTransport::open_stdio(loop);
+        if(!transport) {
+            LOG_ERROR("failed to open stdio transport");
+            return 1;
+        }
+
+        std::unique_ptr<kota::ipc::Transport> final_transport = std::move(*transport);
+        if(!opts.record.empty()) {
+            final_transport =
+                std::make_unique<kota::ipc::RecordingTransport>(std::move(final_transport),
+                                                                opts.record);
+        }
+
+        kota::ipc::JsonPeer lsp_peer(loop, std::move(final_transport));
+        LSPClient lsp_client(server, lsp_peer);
+
+        if(opts.port > 0) {
+            auto acceptor = kota::tcp::listen(opts.host, opts.port, {}, loop);
+            if(acceptor) {
+                LOG_INFO("Agentic protocol listening on {}:{}", opts.host, opts.port);
+                loop.schedule(accept_connections(server, std::move(*acceptor), false, connections));
+            } else {
+                LOG_WARN("Failed to start agentic listener on {}:{}", opts.host, opts.port);
+            }
+        }
+
+        loop.schedule(lsp_peer.run());
+        loop.run();
+        return 0;
+    }
+
+    if(opts.mode == "socket") {
+        auto acceptor = kota::tcp::listen(opts.host, opts.port, {}, loop);
+        if(!acceptor) {
+            LOG_ERROR("failed to listen on {}:{}", opts.host, opts.port);
+            return 1;
+        }
+
+        LOG_INFO("Listening on {}:{} ...", opts.host, opts.port);
+        loop.schedule(accept_connections(server, std::move(*acceptor), true, connections));
+        loop.run();
+        return 0;
+    }
+
+    LOG_ERROR("unknown server mode '{}'", opts.mode);
+    return 1;
+}
+
+struct DaemonConnection {
+    std::unique_ptr<kota::ipc::JsonPeer> peer;
+    std::unique_ptr<AgentClient> agent_client;
+};
+
+static kota::task<> run_daemon_connection(kota::ipc::JsonPeer* peer,
+                                          std::list<DaemonConnection>& connections,
+                                          std::list<DaemonConnection>::iterator pos) {
+    co_await peer->run();
+    LOG_INFO("Daemon client disconnected");
+    connections.erase(pos);
+}
+
+static kota::task<> daemon_main(MasterServer& server, kota::pipe::acceptor acceptor) {
+    auto& loop = kota::event_loop::current();
+    std::list<DaemonConnection> connections;
+    kota::task_group<> connection_group(loop);
+
+    co_await kota::when_all(
+        [&]() -> kota::task<> {
+            while(true) {
+                auto conn = co_await acceptor.accept();
+                if(!conn.has_value())
+                    break;
+
+                LOG_INFO("Daemon client connected");
+
+                auto transport = std::make_unique<kota::ipc::StreamTransport>(std::move(*conn));
+                auto peer = std::make_unique<kota::ipc::JsonPeer>(loop, std::move(transport));
+                auto agent = std::make_unique<AgentClient>(server, *peer);
+
+                auto* peer_ptr = peer.get();
+                auto it = connections.emplace(connections.end(),
+                                              DaemonConnection{
+                                                  .peer = std::move(peer),
+                                                  .agent_client = std::move(agent),
+                                              });
+
+                connection_group.spawn(run_daemon_connection(peer_ptr, connections, it));
+            }
+        }(),
+        [&]() -> kota::task<> {
+            co_await server.get_shutdown_event().wait();
+            acceptor.stop();
+            for(auto& conn: connections) {
+                conn.peer->close();
+            }
+        }());
+
+    co_await connection_group.join();
+}
+
+int run_daemon_mode(const DaemonOptions& opts) {
+    logging::stderr_logger("daemon", logging::options);
+
+    auto socket_path = opts.socket_path.empty() ? path::default_socket_path() : opts.socket_path;
+
+    auto socket_dir = llvm::sys::path::parent_path(socket_path);
+    if(auto ec = llvm::sys::fs::create_directories(socket_dir)) {
+        LOG_ERROR("Failed to create socket directory {}: {}", socket_dir, ec.message());
+        return 1;
+    }
+
+    if(llvm::sys::fs::exists(socket_path)) {
+#ifndef _WIN32
+        int fd = ::socket(AF_UNIX, SOCK_STREAM, 0);
+        if(fd >= 0) {
+            struct sockaddr_un addr{};
+            addr.sun_family = AF_UNIX;
+            auto len = std::min(socket_path.size(), sizeof(addr.sun_path) - 1);
+            std::memcpy(addr.sun_path, socket_path.data(), len);
+            bool live = ::connect(fd, reinterpret_cast<struct sockaddr*>(&addr), sizeof(addr)) == 0;
+            ::close(fd);
+            if(live) {
+                LOG_ERROR("Another daemon is already running on {}", socket_path);
+                return 1;
+            }
+        }
+#endif
+        llvm::sys::fs::remove(socket_path);
+    }
+
+    kota::event_loop loop;
+    MasterServer server(loop, opts.self_path);
+
+    if(!opts.workspace.empty()) {
+        server.initialize(opts.workspace);
+        server.start_file_watcher();
+    }
+
+    auto acceptor = kota::pipe::listen(socket_path, {}, loop);
+    if(!acceptor) {
+        LOG_ERROR("Failed to listen on {}", socket_path);
+        return 1;
+    }
+
+    LOG_INFO("Daemon listening on {}", socket_path);
+    loop.schedule(daemon_main(server, std::move(*acceptor)));
+    loop.run();
+
+    llvm::sys::fs::remove(socket_path);
+    return 0;
+}
+
+}  // namespace clice

src/server/service/master_server.h

@@ -0,0 +1,93 @@
+#pragma once
+
+#include <cstdint>
+#include <string>
+
+#include "server/compiler/compiler.h"
+#include "server/compiler/indexer.h"
+#include "server/service/session.h"
+#include "server/worker/worker_pool.h"
+#include "server/workspace/workspace.h"
+
+#include "kota/async/async.h"
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/StringRef.h"
+
+namespace clice {
+
+enum class ServerLifecycle : std::uint8_t {
+    Uninitialized,
+    Initialized,
+    Ready,
+    ShuttingDown,
+    Exited,
+};
+
+/// Core server state — owns the two-layer state model (Workspace + Sessions),
+/// the worker pool, compilation engine, and indexer.
+///
+/// Does NOT own any transport or peer.  Protocol-specific handler registration
+/// is done by LSPClient and AgentClient, which access private members directly.
+class MasterServer {
+    friend class LSPClient;
+    friend class AgentClient;
+
+public:
+    MasterServer(kota::event_loop& loop, std::string self_path);
+    ~MasterServer();
+
+    void initialize();
+    void initialize(llvm::StringRef root);
+
+    void start_file_watcher();
+
+    Session* find_session(std::uint32_t path_id);
+    Session& open_session(std::uint32_t path_id);
+    void close_session(std::uint32_t path_id, kota::ipc::JsonPeer& peer);
+
+    void on_file_saved(std::uint32_t path_id);
+
+    void schedule_shutdown();
+
+    kota::event& get_shutdown_event() {
+        return shutdown_event;
+    }
+
+private:
+    kota::event shutdown_event;
+    void load_workspace();
+
+    kota::event_loop& loop;
+
+    Workspace workspace;
+    llvm::DenseMap<std::uint32_t, Session> sessions;
+    WorkerPool pool;
+    Compiler compiler;
+    Indexer indexer;
+
+    ServerLifecycle lifecycle = ServerLifecycle::Uninitialized;
+    std::string self_path;
+    std::string workspace_root;
+    std::string session_log_dir;
+    std::string init_options_json;
+};
+
+struct ServerOptions {
+    std::string mode;
+    std::string host = "127.0.0.1";
+    int port = 0;
+    std::string self_path;
+    std::string record;
+};
+
+int run_server_mode(const ServerOptions& opts);
+
+struct DaemonOptions {
+    std::string socket_path;
+    std::string workspace;
+    std::string self_path;
+};
+
+int run_daemon_mode(const DaemonOptions& opts);
+
+}  // namespace clice

src/server/service/session.h

@@ -5,7 +5,7 @@
 #include <optional>
 #include <string>
 
-#include "server/workspace.h"
+#include "server/workspace/workspace.h"
 
 #include "kota/async/async.h"
 #include "llvm/ADT/SmallVector.h"

src/server/worker/stateful_worker.cpp

@@ -1,4 +1,4 @@
-#include "server/stateful_worker.h"
+#include "server/worker/stateful_worker.h"
 
 #include <atomic>
 #include <cstdint>
@@ -10,8 +10,8 @@
 #include "compile/compilation.h"
 #include "feature/feature.h"
 #include "index/tu_index.h"
-#include "server/protocol.h"
-#include "server/worker_common.h"
+#include "server/protocol/worker.h"
+#include "server/worker/worker_common.h"
 #include "support/logging.h"
 
 #include "kota/async/async.h"
@@ -152,6 +152,7 @@ void StatefulWorker::register_handlers() {
 
                 CompilationParams cp;
                 cp.kind = CompilationKind::Content;
+                cp.clang_tidy = params.clang_tidy;
                 fill_args(cp, doc->directory, doc->arguments);
                 if(!doc->pch.first.empty()) {
                     cp.pch = doc->pch;
@@ -245,26 +246,33 @@ void StatefulWorker::register_handlers() {
                     co_return kota::codec::RawValue{"[]"};
                 case K::SemanticTokens:
                     co_return co_await with_ast(params.path, [&](DocumentEntry& doc) {
-                        return to_raw(feature::semantic_tokens(doc.unit));
+                        return to_raw(
+                            feature::semantic_tokens(doc.unit, feature::PositionEncoding::UTF16));
                     });
                 case K::InlayHints:
                     co_return co_await with_ast(params.path, [&](DocumentEntry& doc) {
                         auto range = params.range;
                         if(range.begin == static_cast<uint32_t>(-1))
                             range = LocalSourceRange{0, static_cast<uint32_t>(doc.text.size())};
-                        return to_raw(feature::inlay_hints(doc.unit, range));
+                        return to_raw(feature::inlay_hints(doc.unit,
+                                                           range,
+                                                           {},
+                                                           feature::PositionEncoding::UTF16));
                     });
                 case K::FoldingRange:
                     co_return co_await with_ast(params.path, [&](DocumentEntry& doc) {
-                        return to_raw(feature::folding_ranges(doc.unit));
+                        return to_raw(
+                            feature::folding_ranges(doc.unit, feature::PositionEncoding::UTF16));
                     });
                 case K::DocumentSymbol:
                     co_return co_await with_ast(params.path, [&](DocumentEntry& doc) {
-                        return to_raw(feature::document_symbols(doc.unit));
+                        return to_raw(
+                            feature::document_symbols(doc.unit, feature::PositionEncoding::UTF16));
                     });
                 case K::DocumentLink:
                     co_return co_await with_ast(params.path, [&](DocumentEntry& doc) {
-                        return to_raw(feature::document_links(doc.unit));
+                        return to_raw(
+                            feature::document_links(doc.unit, feature::PositionEncoding::UTF16));
                     });
                 case K::CodeAction:
                     // TODO: Implement code actions

src/server/worker/stateless_worker.cpp

@@ -1,10 +1,10 @@
-#include "server/stateless_worker.h"
+#include "server/worker/stateless_worker.h"
 
 #include "compile/compilation.h"
 #include "feature/feature.h"
 #include "index/tu_index.h"
-#include "server/protocol.h"
-#include "server/worker_common.h"
+#include "server/protocol/worker.h"
+#include "server/worker/worker_common.h"
 #include "support/logging.h"
 
 #include "kota/async/async.h"
@@ -15,6 +15,22 @@
 
 namespace clice {
 
+/// RAII guard that lowers the current process's scheduling priority and
+/// restores it on destruction.
+struct ScopedNice {
+    int saved;
+
+    explicit ScopedNice(int increment = 10) {
+        auto p = kota::sys::priority();
+        saved = p ? *p : 0;
+        kota::sys::set_priority(saved + increment);
+    }
+
+    ~ScopedNice() {
+        kota::sys::set_priority(saved);
+    }
+};
+
 using kota::ipc::RequestResult;
 using RequestContext = kota::ipc::BincodePeer::RequestContext;
 
@@ -258,6 +274,22 @@ static worker::BuildResult handle_signature_help(const worker::BuildParams& para
     return result;
 }
 
+static worker::BuildResult handle_format(const worker::BuildParams& params) {
+    ScopedTimer timer;
+
+    std::optional<LocalSourceRange> range;
+    if(params.format_range.valid()) {
+        range = params.format_range;
+    }
+
+    auto edits = feature::document_format(params.file, params.text, range);
+    LOG_DEBUG("Format done: {} edits, {}ms", edits.size(), timer.ms());
+
+    worker::BuildResult result;
+    result.result_json = to_raw(edits);
+    return result;
+}
+
 int run_stateless_worker_mode(const std::string& worker_name, const std::string& log_dir) {
     logging::stderr_logger(worker_name, logging::options);
     if(!log_dir.empty()) {
@@ -283,9 +315,13 @@ int run_stateless_worker_mode(const std::string& worker_name, const std::string&
             switch(params.kind) {
                 case K::BuildPCH: return handle_build_pch(params);
                 case K::BuildPCM: return handle_build_pcm(params);
-                case K::Index: return handle_index(params);
+                case K::Index: {
+                    ScopedNice guard;
+                    return handle_index(params);
+                }
                 case K::Completion: return handle_completion(params);
                 case K::SignatureHelp: return handle_signature_help(params);
+                case K::Format: return handle_format(params);
             }
             return {false, "Unknown build kind"};
         });

src/server/worker/worker_common.h

@@ -8,8 +8,7 @@
 
 #include "compile/compilation.h"
 
-#include "kota/codec/json/serializer.h"
-#include "kota/codec/raw_value.h"
+#include "kota/codec/json/json.h"
 #include "kota/ipc/codec/json.h"
 
 namespace clice {

src/server/worker/worker_pool.cpp

@@ -1,4 +1,4 @@
-#include "server/worker_pool.h"
+#include "server/worker/worker_pool.h"
 
 #include <csignal>
 #include <string>
@@ -13,14 +13,13 @@ namespace {
 
 /// Coroutine that drains a worker's stderr pipe.
 /// Workers write their own log files, so this only captures unexpected output
-/// (crash stacktraces, assertion failures, etc.) that bypasses spdlog.
+/// (crash stacktraces, assertion failures, sanitizer reports, etc.).
 kota::task<> drain_stderr(kota::pipe stderr_pipe, std::string prefix) {
     std::string buffer;
     while(true) {
         auto result = co_await stderr_pipe.read();
-        if(!result.has_value()) {
+        if(!result.has_value())
             break;
-        }
         auto& chunk = result.value();
         if(chunk.empty())
             break;
@@ -34,7 +33,7 @@ kota::task<> drain_stderr(kota::pipe stderr_pipe, std::string prefix) {
                 break;
             auto line = buffer.substr(pos, nl - pos);
             if(!line.empty()) {
-                LOG_DEBUG("{} {}", prefix, line);
+                LOG_WARN("{} {}", prefix, line);
             }
             pos = nl + 1;
         }
@@ -42,7 +41,7 @@ kota::task<> drain_stderr(kota::pipe stderr_pipe, std::string prefix) {
     }
 
     if(!buffer.empty()) {
-        LOG_DEBUG("{} {}", prefix, buffer);
+        LOG_WARN("{} {}", prefix, buffer);
     }
 }
 
@@ -97,9 +96,8 @@ bool WorkerPool::spawn_worker(const std::string& self_path,
                                                                   std::move(spawn.stdin_pipe));
     auto peer = std::make_unique<kota::ipc::BincodePeer>(loop, std::move(transport));
 
-    // Schedule stderr log collection
     std::string prefix = "[" + worker_name + "]";
-    loop.schedule(drain_stderr(std::move(spawn.stderr_pipe), prefix));
+    io_group.spawn(drain_stderr(std::move(spawn.stderr_pipe), prefix));
 
     workers.push_back(WorkerProcess{
         .proc = std::move(spawn.proc),
@@ -108,24 +106,28 @@ bool WorkerPool::spawn_worker(const std::string& self_path,
     });
 
     auto& w = workers.back();
-    loop.schedule(w.peer->run());
+    w.alive = true;
+    io_group.spawn(w.peer->run());
 
     return true;
 }
 
 bool WorkerPool::start(const WorkerPoolOptions& options) {
+    options_ = options;
     log_dir_ = options.log_dir;
 
     for(std::uint32_t i = 0; i < options.stateless_count; ++i) {
         if(!spawn_worker(options.self_path, false, 0)) {
             return false;
         }
+        monitor_group.spawn(monitor_worker(stateless_workers.size() - 1, false));
     }
 
     for(std::uint32_t i = 0; i < options.stateful_count; ++i) {
         if(!spawn_worker(options.self_path, true, options.worker_memory_limit)) {
             return false;
         }
+        monitor_group.spawn(monitor_worker(stateful_workers.size() - 1, true));
     }
 
     // Register evicted notification handler for each stateful worker
@@ -145,30 +147,19 @@ bool WorkerPool::start(const WorkerPoolOptions& options) {
 
 kota::task<> WorkerPool::stop() {
     LOG_INFO("WorkerPool stopping...");
+    shutting_down_ = true;
 
-    // Close output pipes to signal workers to exit gracefully
-    for(auto& w: stateless_workers) {
+    for(auto& w: stateless_workers)
         w.peer->close_output();
-    }
-    for(auto& w: stateful_workers) {
+    for(auto& w: stateful_workers)
         w.peer->close_output();
-    }
 
-    // Send SIGTERM to all workers
-    for(auto& w: stateless_workers) {
+    for(auto& w: stateless_workers)
         w.proc.kill(SIGTERM);
-    }
-    for(auto& w: stateful_workers) {
+    for(auto& w: stateful_workers)
         w.proc.kill(SIGTERM);
-    }
 
-    // Wait for all worker processes to exit
-    for(auto& w: stateless_workers) {
-        co_await w.proc.wait();
-    }
-    for(auto& w: stateful_workers) {
-        co_await w.proc.wait();
-    }
+    co_await kota::when_all(monitor_group.join(), io_group.join());
 
     LOG_INFO("WorkerPool stopped");
 }
@@ -198,7 +189,10 @@ std::size_t WorkerPool::assign_worker(std::uint32_t path_id) {
 std::size_t WorkerPool::pick_least_loaded() {
     std::size_t best = 0;
     for(std::size_t i = 1; i < stateful_workers.size(); ++i) {
-        if(stateful_workers[i].owned_documents < stateful_workers[best].owned_documents) {
+        if(!stateful_workers[i].alive)
+            continue;
+        if(!stateful_workers[best].alive ||
+           stateful_workers[i].owned_documents < stateful_workers[best].owned_documents) {
             best = i;
         }
     }
@@ -233,4 +227,122 @@ void WorkerPool::clear_owner(std::size_t worker_index) {
     }
 }
 
+kota::task<> WorkerPool::monitor_worker(std::size_t index, bool stateful) {
+    auto& workers = stateful ? stateful_workers : stateless_workers;
+    auto& w = workers[index];
+    auto name = std::string(stateful ? "SF-" : "SL-") + std::to_string(index);
+
+    auto result = co_await w.proc.wait();
+    w.alive = false;
+
+    if(shutting_down_)
+        co_return;
+
+    if(result.has_value()) {
+        auto& exit = result.value();
+        if(exit.term_signal != 0) {
+            LOG_ERROR("Worker {} killed by signal {} (restarts: {})",
+                      name,
+                      exit.term_signal,
+                      w.restart_count);
+        } else {
+            LOG_ERROR("Worker {} exited with code {} (restarts: {})",
+                      name,
+                      exit.status,
+                      w.restart_count);
+        }
+    } else {
+        LOG_ERROR("Worker {} lost: {} (restarts: {})",
+                  name,
+                  result.error().message(),
+                  w.restart_count);
+    }
+
+    if(stateful)
+        clear_owner(index);
+
+    constexpr unsigned max_restarts = 5;
+    if(w.restart_count >= max_restarts) {
+        LOG_ERROR("Worker {} exceeded max restarts ({}), giving up", name, max_restarts);
+        co_return;
+    }
+
+    if(!respawn_worker(index, stateful)) {
+        LOG_ERROR("Worker {} respawn failed", name);
+    }
+}
+
+bool WorkerPool::respawn_worker(std::size_t index, bool stateful) {
+    auto& workers = stateful ? stateful_workers : stateless_workers;
+    auto old_restart_count = workers[index].restart_count + 1;
+    auto worker_name = std::string(stateful ? "SF-" : "SL-") + std::to_string(index);
+
+    // Close the old peer and retire it so its coroutines (run/write_loop)
+    // can finish naturally before the object is destroyed.
+    if(workers[index].peer) {
+        workers[index].peer->close();
+        retired_peers.push_back(std::move(workers[index].peer));
+    }
+
+    kota::process::options opts;
+    opts.file = options_.self_path;
+    if(stateful) {
+        opts.args = {options_.self_path,
+                     "--mode",
+                     "stateful-worker",
+                     "--worker-memory-limit",
+                     std::to_string(options_.worker_memory_limit)};
+    } else {
+        opts.args = {options_.self_path, "--mode", "stateless-worker"};
+    }
+    opts.args.push_back("--worker-name");
+    opts.args.push_back(worker_name);
+    if(!log_dir_.empty()) {
+        opts.args.push_back("--log-dir");
+        opts.args.push_back(log_dir_);
+    }
+    opts.streams = {
+        kota::process::stdio::pipe(true, false),
+        kota::process::stdio::pipe(false, true),
+        kota::process::stdio::pipe(false, true),
+    };
+
+    auto result = kota::process::spawn(opts, loop);
+    if(!result) {
+        LOG_ERROR("Failed to respawn worker {}: {}", worker_name, result.error().message());
+        return false;
+    }
+
+    auto& spawn = *result;
+    auto transport = std::make_unique<kota::ipc::StreamTransport>(std::move(spawn.stdout_pipe),
+                                                                  std::move(spawn.stdin_pipe));
+    auto peer = std::make_unique<kota::ipc::BincodePeer>(loop, std::move(transport));
+
+    std::string prefix = "[" + worker_name + "]";
+    io_group.spawn(drain_stderr(std::move(spawn.stderr_pipe), prefix));
+
+    workers[index] = WorkerProcess{
+        .proc = std::move(spawn.proc),
+        .peer = std::move(peer),
+        .owned_documents = 0,
+        .alive = true,
+        .restart_count = old_restart_count,
+    };
+
+    auto& w = workers[index];
+    io_group.spawn(w.peer->run());
+
+    if(stateful) {
+        w.peer->on_notification([this](const worker::EvictedParams& params) {
+            if(on_evicted)
+                on_evicted(params.path);
+        });
+    }
+
+    monitor_group.spawn(monitor_worker(index, stateful));
+
+    LOG_INFO("Worker {} restarted (attempt {})", worker_name, old_restart_count);
+    return true;
+}
+
 }  // namespace clice

src/server/worker/worker_pool.h

@@ -6,7 +6,7 @@
 #include <list>
 #include <memory>
 
-#include "server/protocol.h"
+#include "server/protocol/worker.h"
 
 #include "kota/async/async.h"
 #include "kota/ipc/codec/bincode.h"
@@ -64,6 +64,8 @@ private:
         kota::process proc;
         std::unique_ptr<kota::ipc::BincodePeer> peer;
         std::size_t owned_documents = 0;
+        bool alive = true;
+        unsigned restart_count = 0;
     };
 
     kota::event_loop& loop;
@@ -80,8 +82,19 @@ private:
     void clear_owner(std::size_t worker_index);
     std::size_t pick_least_loaded();
 
+    bool shutting_down_ = false;
+    kota::task_group<> monitor_group{loop};
+    kota::task_group<> io_group{loop};
+    WorkerPoolOptions options_;
     std::string log_dir_;
+
+    /// Peers moved here during respawn so their coroutines can finish
+    /// before the object is destroyed.
+    llvm::SmallVector<std::unique_ptr<kota::ipc::BincodePeer>> retired_peers;
+
     bool spawn_worker(const std::string& self_path, bool stateful, std::uint64_t memory_limit);
+    bool respawn_worker(std::size_t index, bool stateful);
+    kota::task<> monitor_worker(std::size_t index, bool stateful);
 };
 
 template <typename Params>
@@ -91,11 +104,10 @@ RequestResult<Params> WorkerPool::send_stateful(std::uint32_t path_id,
     if(stateful_workers.empty()) {
         co_return kota::outcome_error(kota::ipc::Error{"No stateful workers available"});
     }
-    // No timeout: compile tasks run as detached tasks (loop.schedule) that
-    // are immune to LSP $/cancelRequest.  Adding a timeout here would use
-    // kotatsu's with_token/when_any which has a spurious-cancellation bug
-    // that kills requests within milliseconds instead of the configured period.
     auto idx = assign_worker(path_id);
+    if(!stateful_workers[idx].alive) {
+        co_return kota::outcome_error(kota::ipc::Error{"Assigned stateful worker is down"});
+    }
     co_return co_await stateful_workers[idx].peer->send_request(params, opts);
 }
 
@@ -105,9 +117,16 @@ RequestResult<Params> WorkerPool::send_stateless(const Params& params,
     if(stateless_workers.empty()) {
         co_return kota::outcome_error(kota::ipc::Error{"No stateless workers available"});
     }
-    auto idx = next_stateless;
-    next_stateless = (next_stateless + 1) % stateless_workers.size();
-    co_return co_await stateless_workers[idx].peer->send_request(params, opts);
+    // Round-robin, skipping dead workers.
+    auto start = next_stateless;
+    for(std::size_t i = 0; i < stateless_workers.size(); ++i) {
+        auto idx = (start + i) % stateless_workers.size();
+        if(stateless_workers[idx].alive) {
+            next_stateless = (idx + 1) % stateless_workers.size();
+            co_return co_await stateless_workers[idx].peer->send_request(params, opts);
+        }
+    }
+    co_return kota::outcome_error(kota::ipc::Error{"All stateless workers are down"});
 }
 
 template <typename Params>
@@ -115,6 +134,8 @@ void WorkerPool::notify_stateful(std::uint32_t path_id, const Params& params) {
     auto it = owner.find(path_id);
     if(it == owner.end())
         return;
+    if(!stateful_workers[it->second].alive)
+        return;
     stateful_workers[it->second].peer->send_notification(params);
 }
 

src/server/workspace/config.cpp

@@ -0,0 +1,195 @@
+#include "server/workspace/config.h"
+
+#include <algorithm>
+
+#include "support/filesystem.h"
+#include "support/glob_pattern.h"
+#include "support/logging.h"
+
+#include "kota/async/io/system.h"
+#include "kota/codec/json/json.h"
+#include "kota/codec/toml/toml.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/Path.h"
+#include "llvm/Support/Process.h"
+#include "llvm/Support/xxhash.h"
+
+namespace clice {
+
+/// Replace all occurrences of ${workspace} with the workspace root.
+/// No-op when workspace_root is empty, to avoid producing paths like "/cache"
+/// from "${workspace}/cache".
+static void substitute_workspace(std::string& value, llvm::StringRef workspace_root) {
+    if(workspace_root.empty())
+        return;
+    constexpr std::string_view placeholder = "${workspace}";
+    std::size_t pos = 0;
+    while((pos = value.find(placeholder, pos)) != std::string::npos) {
+        value.replace(pos, placeholder.size(), workspace_root);
+        pos += workspace_root.size();
+    }
+}
+
+/// Try to resolve the default cache directory using XDG_CACHE_HOME.
+/// Returns empty string on failure.
+static std::string resolve_xdg_cache_dir(llvm::StringRef workspace_root) {
+    // Determine base: $XDG_CACHE_HOME or ~/.cache
+    std::string base;
+    if(auto xdg = llvm::sys::Process::GetEnv("XDG_CACHE_HOME"); xdg && !xdg->empty()) {
+        base = std::move(*xdg);
+    } else if(auto home = llvm::sys::Process::GetEnv("HOME"); home && !home->empty()) {
+        base = path::join(*home, ".cache");
+    } else {
+        return {};
+    }
+
+    // Use a hash of workspace_root to create a unique subdirectory.
+    auto hash = llvm::xxh3_64bits(workspace_root);
+    auto dir = path::join(base, "clice", std::format("{:016x}", hash));
+
+    if(auto ec = llvm::sys::fs::create_directories(dir)) {
+        LOG_WARN("Failed to create XDG cache directory {}: {}", dir, ec.message());
+        return {};
+    }
+    return dir;
+}
+
+void Config::apply_defaults(llvm::StringRef workspace_root) {
+    auto& p = project;
+
+    if(p.max_active_file == 0)
+        p.max_active_file = 8;
+    if(!p.enable_indexing)
+        p.enable_indexing = true;
+    if(!p.idle_timeout_ms)
+        p.idle_timeout_ms = 3000;
+
+    if(p.stateful_worker_count == 0)
+        p.stateful_worker_count = 2;
+    if(p.stateless_worker_count == 0) {
+        auto cores = kota::sys::parallelism();
+        p.stateless_worker_count = std::max(cores / 2, 2u);
+    }
+    if(p.worker_memory_limit == 0)
+        p.worker_memory_limit = 4ULL * 1024 * 1024 * 1024;  // 4GB
+
+    if(p.cache_dir.empty() && !workspace_root.empty()) {
+        p.cache_dir = resolve_xdg_cache_dir(workspace_root);
+        if(p.cache_dir.empty())
+            p.cache_dir = path::join(workspace_root, ".clice");
+    }
+    if(p.index_dir.empty() && !p.cache_dir.empty())
+        p.index_dir = path::join(p.cache_dir, "index");
+    if(p.logging_dir.empty() && !p.cache_dir.empty())
+        p.logging_dir = path::join(p.cache_dir, "logs");
+
+    // Variable substitution on string fields.
+    substitute_workspace(p.cache_dir, workspace_root);
+    substitute_workspace(p.index_dir, workspace_root);
+    substitute_workspace(p.logging_dir, workspace_root);
+    for(auto& entry: p.compile_commands_paths)
+        substitute_workspace(entry, workspace_root);
+
+    // Pre-compile glob patterns from rules.
+    compiled_rules.clear();
+    for(auto& rule: rules) {
+        CompiledRule compiled;
+        for(auto& pattern_str: rule.patterns) {
+            auto pat = GlobPattern::create(pattern_str);
+            if(!pat) {
+                LOG_WARN("Invalid glob pattern in rule: {}", pattern_str);
+                continue;
+            }
+            compiled.patterns.push_back(std::move(*pat));
+        }
+        // Drop the whole rule if no pattern compiled successfully — otherwise the
+        // append/remove flags would be silently attached to a rule that can never match.
+        if(compiled.patterns.empty()) {
+            if(!rule.patterns.empty())
+                LOG_WARN("Rule dropped: all glob patterns failed to compile");
+            continue;
+        }
+        compiled.append.assign(rule.append.begin(), rule.append.end());
+        compiled.remove.assign(rule.remove.begin(), rule.remove.end());
+        compiled_rules.push_back(std::move(compiled));
+    }
+}
+
+void Config::match_rules(llvm::StringRef file_path,
+                         std::vector<std::string>& append,
+                         std::vector<std::string>& remove) const {
+    // Rules are processed in declaration order so that a later rule can
+    // override an earlier one. Specifically, when a later rule removes
+    // an argument, we also strip any string-equal entry already added
+    // to `append` by an earlier matching rule — otherwise the append
+    // would silently survive (lookup applies removes to the base flags
+    // only, not to entries contributed via `append`).
+    for(auto& rule: compiled_rules) {
+        bool matched =
+            std::ranges::any_of(rule.patterns, [&](auto& pat) { return pat.match(file_path); });
+        if(!matched)
+            continue;
+
+        for(auto& r: rule.remove) {
+            std::erase(append, r);
+            remove.push_back(r);
+        }
+        append.insert(append.end(), rule.append.begin(), rule.append.end());
+    }
+}
+
+std::optional<Config> Config::load(llvm::StringRef path, llvm::StringRef workspace_root) {
+    auto content = fs::read(path);
+    if(!content)
+        return std::nullopt;
+
+    auto result = kota::codec::toml::parse<Config>(*content);
+    if(!result) {
+        LOG_ERROR("Invalid clice.toml {}: {}", path, result.error().to_string());
+        return std::nullopt;
+    }
+
+    auto config = std::move(*result);
+    config.apply_defaults(workspace_root);
+    LOG_INFO("Loaded config from {}", path);
+    return config;
+}
+
+std::optional<Config> Config::load_from_json(llvm::StringRef json, llvm::StringRef workspace_root) {
+    Config config{};
+    auto result = kota::codec::json::from_json(json, config);
+    if(!result) {
+        LOG_WARN("Failed to parse initializationOptions JSON: {}", result.error().message);
+        return std::nullopt;
+    }
+
+    config.apply_defaults(workspace_root);
+    LOG_INFO("Loaded config from initializationOptions");
+    return config;
+}
+
+Config Config::load_from_workspace(llvm::StringRef workspace_root) {
+    if(!workspace_root.empty()) {
+        for(auto* name: {"clice.toml", ".clice/config.toml"}) {
+            auto config_path = path::join(workspace_root, name);
+            if(!llvm::sys::fs::exists(config_path))
+                continue;
+            if(auto config = load(config_path, workspace_root))
+                return std::move(*config);
+            // Present but malformed: fall through to defaults, but surface
+            // the situation clearly so users know their config wasn't applied.
+            LOG_WARN("Falling back to default configuration because {} is invalid", config_path);
+        }
+    }
+
+    Config config;
+    config.apply_defaults(workspace_root);
+    LOG_INFO(
+        "No clice.toml found, using default configuration " "(stateful={}, stateless={}, memory_limit={}MB)",
+        config.project.stateful_worker_count.value,
+        config.project.stateless_worker_count.value,
+        config.project.worker_memory_limit.value / (1024 * 1024));
+    return config;
+}
+
+}  // namespace clice

src/server/workspace/config.h

@@ -0,0 +1,79 @@
+#pragma once
+
+#include <cstdint>
+#include <optional>
+#include <string>
+#include <vector>
+
+#include "support/glob_pattern.h"
+
+#include "kota/meta/annotation.h"
+#include "llvm/ADT/StringRef.h"
+
+namespace clice {
+
+using kota::meta::defaulted;
+
+/// A file-pattern rule that appends/removes compilation flags.
+/// Corresponds to `[[rules]]` in clice.toml.
+struct ConfigRule {
+    defaulted<std::vector<std::string>> patterns;
+    defaulted<std::vector<std::string>> append;
+    defaulted<std::vector<std::string>> remove;
+};
+
+/// Corresponds to the `[project]` section in clice.toml.
+struct ProjectConfig {
+    defaulted<bool> clang_tidy = {};
+    defaulted<int> max_active_file = {};
+
+    defaulted<std::string> cache_dir;
+    defaulted<std::string> index_dir;
+    defaulted<std::string> logging_dir;
+
+    defaulted<std::vector<std::string>> compile_commands_paths;
+
+    std::optional<bool> enable_indexing;
+    std::optional<int> idle_timeout_ms;
+
+    defaulted<std::uint32_t> stateful_worker_count = {};
+    defaulted<std::uint32_t> stateless_worker_count = {};
+    defaulted<std::uint64_t> worker_memory_limit = {};
+};
+
+struct CompiledRule {
+    std::vector<GlobPattern> patterns;
+    std::vector<std::string> append;
+    std::vector<std::string> remove;
+};
+
+/// Configuration for the clice LSP server, loadable from clice.toml
+/// or passed via LSP initializationOptions.
+struct Config {
+    defaulted<ProjectConfig> project;
+
+    defaulted<std::vector<ConfigRule>> rules;
+
+    kota::meta::annotation<std::vector<CompiledRule>, kota::meta::attrs::skip> compiled_rules;
+
+    /// Compute default values for any field left at its zero/empty sentinel.
+    void apply_defaults(llvm::StringRef workspace_root);
+
+    /// Collect append/remove flags from all rules whose patterns match `path`.
+    void match_rules(llvm::StringRef path,
+                     std::vector<std::string>& append,
+                     std::vector<std::string>& remove) const;
+
+    /// Try to load configuration from a TOML file.
+    static std::optional<Config> load(llvm::StringRef path, llvm::StringRef workspace_root);
+
+    /// Try to load configuration from a JSON string (e.g. initializationOptions).
+    static std::optional<Config> load_from_json(llvm::StringRef json,
+                                                llvm::StringRef workspace_root);
+
+    /// Load config from the workspace, trying standard locations.
+    /// Returns a default config (with apply_defaults) if no file is found.
+    static Config load_from_workspace(llvm::StringRef workspace_root);
+};
+
+}  // namespace clice

src/server/workspace/workspace.cpp

@@ -1,4 +1,4 @@
-#include "server/workspace.h"
+#include "server/workspace/workspace.h"
 
 #include <algorithm>
 #include <chrono>
@@ -183,10 +183,10 @@ struct CacheData {
 }  // namespace
 
 void Workspace::load_cache() {
-    if(config.cache_dir.empty())
+    if(config.project.cache_dir.empty())
         return;
 
-    auto cache_path = path::join(config.cache_dir, "cache", "cache.json");
+    auto cache_path = path::join(config.project.cache_dir, "cache", "cache.json");
     auto content = fs::read(cache_path);
     if(!content) {
         LOG_DEBUG("No cache.json found at {}", cache_path);
@@ -218,7 +218,7 @@ void Workspace::load_cache() {
     };
 
     for(auto& entry: data.pch) {
-        auto pch_path = path::join(config.cache_dir, "cache", "pch", entry.filename);
+        auto pch_path = path::join(config.project.cache_dir, "cache", "pch", entry.filename);
         auto source = resolve(entry.source_file);
         if(!llvm::sys::fs::exists(pch_path) || source.empty())
             continue;
@@ -234,7 +234,7 @@ void Workspace::load_cache() {
     }
 
     for(auto& entry: data.pcm) {
-        auto pcm_path = path::join(config.cache_dir, "cache", "pcm", entry.filename);
+        auto pcm_path = path::join(config.project.cache_dir, "cache", "pcm", entry.filename);
         auto source = resolve(entry.source_file);
         if(!llvm::sys::fs::exists(pcm_path) || source.empty())
             continue;
@@ -252,7 +252,7 @@ void Workspace::load_cache() {
 }
 
 void Workspace::save_cache() {
-    if(config.cache_dir.empty())
+    if(config.project.cache_dir.empty())
         return;
 
     CacheData data;
@@ -306,7 +306,7 @@ void Workspace::save_cache() {
         return;
     }
 
-    auto cache_path = path::join(config.cache_dir, "cache", "cache.json");
+    auto cache_path = path::join(config.project.cache_dir, "cache", "cache.json");
     auto tmp_path = cache_path + ".tmp";
     auto write_result = fs::write(tmp_path, *json_str);
     if(!write_result) {
@@ -321,14 +321,14 @@ void Workspace::save_cache() {
 }
 
 void Workspace::cleanup_cache(int max_age_days) {
-    if(config.cache_dir.empty())
+    if(config.project.cache_dir.empty())
         return;
 
     auto now = std::chrono::system_clock::now();
     auto max_age = std::chrono::hours(max_age_days * 24);
 
     for(auto* subdir: {"cache/pch", "cache/pcm"}) {
-        auto dir = path::join(config.cache_dir, subdir);
+        auto dir = path::join(config.project.cache_dir, subdir);
         std::error_code ec;
         for(auto it = llvm::sys::fs::directory_iterator(dir, ec);
             !ec && it != llvm::sys::fs::directory_iterator();

src/server/workspace/workspace.h

@@ -11,8 +11,8 @@
 #include "index/merged_index.h"
 #include "index/project_index.h"
 #include "semantic/relation_kind.h"
-#include "server/compile_graph.h"
-#include "server/config.h"
+#include "server/compiler/compile_graph.h"
+#include "server/workspace/config.h"
 #include "support/path_pool.h"
 #include "syntax/dependency_graph.h"
 
@@ -170,7 +170,7 @@ struct PCMState {
 ///   - didSave         (on_file_saved: rescan disk, cascade invalidation)
 ///   - Background index (merge TUIndex results from stateless workers)
 struct Workspace {
-    CliceConfig config;
+    Config config;
     CompilationDatabase cdb;
 
     PathPool path_pool;

src/support/filesystem.h

@@ -37,6 +37,14 @@ inline std::string real_path(llvm::StringRef file) {
     return path.str().str();
 }
 
+inline std::string default_socket_path() {
+    llvm::SmallString<128> home;
+    if(!llvm::sys::path::home_directory(home))
+        return "/tmp/clice.sock";
+    llvm::sys::path::append(home, ".clice", "clice.sock");
+    return home.str().str();
+}
+
 }  // namespace path
 
 namespace fs {

src/support/glob_pattern.cpp

@@ -289,7 +289,7 @@ std::expected<GlobPattern::SubGlobPattern, std::string>
     return pat;
 }
 
-bool GlobPattern::match(llvm::StringRef str) {
+bool GlobPattern::match(llvm::StringRef str) const {
     if(!str.consume_front(prefix)) {
         return false;
     }

src/support/glob_pattern.h

@@ -54,7 +54,7 @@ public:
     }
 
     /// \returns \p true if \p str matches this glob pattern
-    bool match(llvm::StringRef s);
+    bool match(llvm::StringRef s) const;
 
 private:
     /// GlobPattern is seperated into `Prefix + SubGlobPattern`

src/syntax/dependency_graph.cpp

@@ -256,7 +256,8 @@ kota::task<> scan_impl(CompilationDatabase& cdb,
                        DependencyGraph& graph,
                        ScanReport& report,
                        ScanCache* ext_cache,
-                       kota::event_loop& loop) {
+                       kota::event_loop& loop,
+                       const RuleMatcher& rule_matcher) {
     auto start_time = std::chrono::steady_clock::now();
 
     // Reuse context groups and configs from cache when available (warm runs).
@@ -355,9 +356,19 @@ kota::task<> scan_impl(CompilationDatabase& cdb,
             std::uint32_t config_id = next_config_id++;
             context_to_config_id[context] = config_id;
             auto representative_path = path_pool.resolve(file_ids[0]);
+
+            // Apply per-file rules so that `[[rules]]`-modified -I/-isystem/-std
+            // flags are reflected in the search config used by the scan.
+            // Rules are applied to the representative file and assumed to hold
+            // for the whole context group (same CompilationInfo).
+            std::vector<std::string> rule_append, rule_remove;
+            if(rule_matcher)
+                rule_matcher(representative_path, rule_append, rule_remove);
+
             auto t0 = std::chrono::steady_clock::now();
-            configs[config_id] =
-                cdb.lookup_search_config(representative_path, {.query_toolchain = true});
+            configs[config_id] = cdb.lookup_search_config(
+                representative_path,
+                {.query_toolchain = true, .remove = rule_remove, .append = rule_append});
             auto t1 = std::chrono::steady_clock::now();
             lookup_us += std::chrono::duration_cast<std::chrono::microseconds>(t1 - t0).count();
         }
@@ -819,14 +830,15 @@ kota::task<> scan_impl(CompilationDatabase& cdb,
 ScanReport scan_dependency_graph(CompilationDatabase& cdb,
                                  PathPool& path_pool,
                                  DependencyGraph& graph,
-                                 ScanCache* cache) {
+                                 ScanCache* cache,
+                                 const RuleMatcher& rule_matcher) {
     ScanReport report;
     if(cdb.get_entries().empty()) {
         return report;
     }
 
     kota::event_loop loop;
-    loop.schedule(scan_impl(cdb, path_pool, graph, report, cache, loop));
+    loop.schedule(scan_impl(cdb, path_pool, graph, report, cache, loop, rule_matcher));
     loop.run();
     return report;
 }

src/syntax/dependency_graph.h

@@ -1,6 +1,7 @@
 #pragma once
 
 #include <cstdint>
+#include <functional>
 #include <string>
 #include <vector>
 
@@ -253,6 +254,12 @@ struct ScanCache {
     std::vector<WaveEntry> initial_wave;
 };
 
+/// Callback for per-file rule-based flag modification. Given a file path,
+/// populates `append`/`remove` with rule-configured arguments so they can be
+/// layered on top of the CDB command when extracting the search config.
+using RuleMatcher = std::function<
+    void(llvm::StringRef path, std::vector<std::string>& append, std::vector<std::string>& remove)>;
+
 /// Run the wavefront BFS scan over all files in the compilation database.
 /// Internally creates a local event loop for async I/O (file reads via worker
 /// thread pool, stat calls via libuv). Blocks until the scan is complete.
@@ -261,9 +268,14 @@ struct ScanCache {
 ///               avoids repeated readdir() and include-resolution work across
 ///               successive calls.  PathPool must NOT be reset between calls
 ///               when a persistent cache is used (path_id values must remain stable).
+/// @param rule_matcher  Optional callback applied per context group so that
+///               `[[rules]]`-modified include/std flags are reflected in the
+///               dependency graph (otherwise rule-affected files would have
+///               stale resolution).
 ScanReport scan_dependency_graph(CompilationDatabase& cdb,
                                  PathPool& path_pool,
                                  DependencyGraph& graph,
-                                 ScanCache* cache = nullptr);
+                                 ScanCache* cache = nullptr,
+                                 const RuleMatcher& rule_matcher = {});
 
 }  // namespace clice

tests/conftest.py

@@ -1,6 +1,7 @@
 import asyncio
 import json
 import shutil
+import socket
 import subprocess
 import sys
 from pathlib import Path
@@ -93,29 +94,67 @@ def workspace(request: pytest.FixtureRequest, test_data_dir: Path) -> Path | Non
 
 @pytest.fixture
 async def client(
-    request: pytest.FixtureRequest, executable: Path, workspace: Path | None
+    request: pytest.FixtureRequest,
+    executable: Path,
+    workspace: Path | None,
 ):
     """Spawn clice server, auto-initialize if @pytest.mark.workspace is present."""
     config = request.config
     mode = config.getoption("--mode")
+    host = config.getoption("--host")
 
-    cmd = [str(executable), "--mode", mode]
-    if mode == "socket":
-        host = config.getoption("--host")
-        port = config.getoption("--port")
-        cmd += ["--host", host, "--port", str(port)]
+    cmd = [str(executable), "--mode", mode, "--host", host]
 
     c = CliceClient()
     await c.start_io(*cmd)
 
     if workspace is not None:
-        await c.initialize(workspace)
+        init_options_marker = request.node.get_closest_marker("init_options")
+        init_options = dict(init_options_marker.args[0]) if init_options_marker else {}
+        # Force cache_dir into the workspace so .clice/ cleanup prevents stale PCH.
+        project = dict(init_options.get("project", {}))
+        project.setdefault("cache_dir", str(workspace / ".clice"))
+        init_options["project"] = project
+        await c.initialize(workspace, initialization_options=init_options)
 
     yield c
 
     await _shutdown_client(c)
 
 
+def _find_free_port() -> int:
+    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
+        s.bind(("127.0.0.1", 0))
+        return s.getsockname()[1]
+
+
+@pytest.fixture
+async def agentic(
+    request: pytest.FixtureRequest,
+    executable: Path,
+    workspace: Path | None,
+):
+    """Start a server with agentic TCP port, yield (executable, host, port)."""
+    host = "127.0.0.1"
+    port = _find_free_port()
+    cmd = [str(executable), "--mode", "pipe", "--host", host, "--port", str(port)]
+
+    c = CliceClient()
+    await c.start_io(*cmd)
+
+    if workspace is not None:
+        init_options_marker = request.node.get_closest_marker("init_options")
+        init_options = dict(init_options_marker.args[0]) if init_options_marker else {}
+        project = dict(init_options.get("project", {}))
+        project.setdefault("cache_dir", str(workspace / ".clice"))
+        init_options["project"] = project
+        await c.initialize(workspace, initialization_options=init_options)
+
+    yield executable, host, port
+
+    await _shutdown_client(c)
+
+
 def generate_cdb(workspace: Path) -> None:
     """Generate compile_commands.json using CMake with Ninja backend."""
     cmake = shutil.which("cmake")
@@ -163,12 +202,17 @@ async def _shutdown_client(c: CliceClient) -> None:
 
     try:
         server = getattr(c, "_server", None)
-        if server and server.stderr:
-            stderr_data = await asyncio.wait_for(server.stderr.read(), timeout=2.0)
-            if stderr_data:
-                for line in stderr_data.decode("utf-8", errors="replace").splitlines():
-                    if "[warn]" in line or "[error]" in line:
-                        print(f"[server] {line}", flush=True)
+        if server:
+            if server.returncode is not None:
+                print(f"[server] exit code: {server.returncode}", flush=True)
+            if server.stderr:
+                stderr_data = await asyncio.wait_for(server.stderr.read(), timeout=2.0)
+                if stderr_data:
+                    for line in stderr_data.decode(
+                        "utf-8", errors="replace"
+                    ).splitlines():
+                        if "[warn]" in line or "[error]" in line or "Sanitizer" in line:
+                            print(f"[server] {line}", flush=True)
     except Exception:
         pass
 
@@ -239,6 +283,21 @@ def _generate_test_data_cdbs(data_dir: Path) -> None:
             dl_dir, [_entry(dl_dir, dl_main, [f"-I{dl_dir.as_posix()}", "-std=c++23"])]
         )
 
+    # config_rules_toml / config_rules_no_config — rules tests must start
+    # from a CDB that does NOT include the flag the rule will append, so the
+    # rule's effect is observable through diagnostics.
+    for name in ("config_rules_toml", "config_rules_no_config"):
+        cr_dir = data_dir / name
+        cr_main = cr_dir / "main.cpp"
+        if cr_main.exists():
+            _write(cr_dir, [_entry(cr_dir, cr_main)])
+
+    # formatting
+    fmt_dir = data_dir / "formatting"
+    fmt_main = fmt_dir / "main.cpp"
+    if fmt_main.exists():
+        _write(fmt_dir, [_entry(fmt_dir, fmt_main)])
+
     # pch_test
     pt_dir = data_dir / "pch_test"
     if pt_dir.exists():

tests/corpus/statements/if/basic_if.cpp

@@ -0,0 +1,36 @@
+// basic if and if-else
+namespace basic_if {
+
+int abs_val(int x) {
+    if(x < 0)
+        return -x;
+    return x;
+}
+
+const char* sign(int x) {
+    if(x > 0) {
+        return "positive";
+    } else if(x < 0) {
+        return "negative";
+    } else {
+        return "zero";
+    }
+}
+
+// dangling else: else binds to nearest if
+int nested_if(int a, int b) {
+    if(a > 0)
+        if(b > 0)
+            return 1;
+        else
+            return 2;
+    return 0;
+}
+
+void test() {
+    [[maybe_unused]] int r1 = abs_val(-3);
+    [[maybe_unused]] auto r2 = sign(5);
+    [[maybe_unused]] int r3 = nested_if(1, -1);
+}
+
+}  // namespace basic_if

tests/data/config_rules_no_config/main.cpp

@@ -0,0 +1,7 @@
+int value() {
+    return FROM_INIT;
+}
+
+int main() {
+    return value();
+}

tests/data/config_rules_toml/clice.toml

@@ -0,0 +1,3 @@
+[[rules]]
+patterns = ["**/*.cpp"]
+append = ["-DFROM_TOML"]

tests/data/config_rules_toml/main.cpp

@@ -0,0 +1,7 @@
+int value() {
+    return FROM_TOML;
+}
+
+int main() {
+    return value();
+}

tests/data/formatting/.clang-format

@@ -0,0 +1,3 @@
+BasedOnStyle: LLVM
+IndentWidth: 4
+ColumnLimit: 80

tests/data/formatting/main.cpp

@@ -0,0 +1 @@
+int add(int a, int b) { return a + b; }

tests/integration/agentic/test_agentic.py

@@ -0,0 +1,592 @@
+"""Tests for the agentic protocol handlers."""
+
+import asyncio
+import json
+import socket
+import subprocess
+from concurrent.futures import ThreadPoolExecutor
+
+import pytest
+
+from tests.integration.utils.wait import wait_for_index
+
+
+class AgenticRpcClient:
+    """Minimal JSON-RPC client that speaks Content-Length framing over TCP."""
+
+    def __init__(self, host: str, port: int):
+        self.sock = socket.create_connection((host, port), timeout=10)
+        self.request_id = 0
+        self.buffer = b""
+
+    def request(self, method: str, params: dict):
+        self.request_id += 1
+        body = json.dumps(
+            {
+                "jsonrpc": "2.0",
+                "id": self.request_id,
+                "method": method,
+                "params": params,
+            }
+        )
+        payload = f"Content-Length: {len(body)}\r\n\r\n{body}".encode("utf-8")
+        self.sock.sendall(payload)
+        return self._read_response()
+
+    def _read_response(self):
+        while b"\r\n\r\n" not in self.buffer:
+            data = self.sock.recv(4096)
+            if not data:
+                raise ConnectionError("connection closed")
+            self.buffer += data
+
+        header_end = self.buffer.index(b"\r\n\r\n")
+        headers = self.buffer[:header_end].decode("utf-8")
+        self.buffer = self.buffer[header_end + 4 :]
+
+        content_length = 0
+        for line in headers.split("\r\n"):
+            if line.lower().startswith("content-length:"):
+                content_length = int(line.split(":")[1].strip())
+
+        while len(self.buffer) < content_length:
+            data = self.sock.recv(4096)
+            if not data:
+                raise ConnectionError("connection closed")
+            self.buffer += data
+
+        body = self.buffer[:content_length].decode("utf-8")
+        self.buffer = self.buffer[content_length:]
+        return json.loads(body)
+
+    def close(self):
+        self.sock.close()
+
+
+def run_agentic(executable, host, port, path, timeout=10):
+    result = subprocess.run(
+        [
+            str(executable),
+            "--mode",
+            "agentic",
+            "--host",
+            host,
+            "--port",
+            str(port),
+            "--path",
+            path,
+        ],
+        capture_output=True,
+        text=True,
+        timeout=timeout,
+    )
+    return result
+
+
+@pytest.mark.workspace("hello_world")
+async def test_compile_command(agentic, workspace):
+    executable, host, port = agentic
+    main_cpp = (workspace / "main.cpp").as_posix()
+    result = run_agentic(executable, host, port, main_cpp)
+    assert result.returncode == 0, f"stderr: {result.stderr}"
+    data = json.loads(result.stdout)
+    assert data["file"] == main_cpp
+    assert data["directory"] == workspace.as_posix()
+    assert len(data["arguments"]) > 0
+
+
+@pytest.mark.workspace("hello_world")
+async def test_compile_command_fallback(agentic, workspace):
+    executable, host, port = agentic
+    result = run_agentic(executable, host, port, "/nonexistent/file.cpp")
+    assert result.returncode == 0, f"stderr: {result.stderr}"
+    data = json.loads(result.stdout)
+    assert data["file"] == "/nonexistent/file.cpp"
+
+
+@pytest.mark.workspace("hello_world")
+async def test_multiple_requests(agentic, workspace):
+    executable, host, port = agentic
+    main_cpp = (workspace / "main.cpp").as_posix()
+    for _ in range(3):
+        result = run_agentic(executable, host, port, main_cpp)
+        assert result.returncode == 0, f"stderr: {result.stderr}"
+        data = json.loads(result.stdout)
+        assert data["file"] == main_cpp
+
+
+async def test_connection_refused(executable):
+    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
+        s.bind(("127.0.0.1", 0))
+        free_port = s.getsockname()[1]
+    result = run_agentic(executable, "127.0.0.1", free_port, "/some/file.cpp")
+    assert result.returncode != 0
+
+
+@pytest.mark.workspace("hello_world")
+async def test_concurrent_connections(agentic, workspace):
+    executable, host, port = agentic
+    main_cpp = (workspace / "main.cpp").as_posix()
+
+    def do_request(_):
+        return run_agentic(executable, host, port, main_cpp)
+
+    with ThreadPoolExecutor(max_workers=4) as pool:
+        results = list(pool.map(do_request, range(4)))
+
+    for r in results:
+        assert r.returncode == 0, f"stderr: {r.stderr}"
+        data = json.loads(r.stdout)
+        assert data["file"] == main_cpp
+
+
+@pytest.fixture
+async def indexed_agentic(request, executable, workspace):
+    """Start server with LSP+agentic, compile a file, wait for indexing."""
+    from tests.integration.utils.client import CliceClient
+    from tests.conftest import _shutdown_client, _find_free_port
+
+    host = "127.0.0.1"
+    port = _find_free_port()
+    cmd = [str(executable), "--mode", "pipe", "--host", host, "--port", str(port)]
+
+    c = CliceClient()
+    await c.start_io(*cmd)
+
+    init_options = {"project": {"cache_dir": str(workspace / ".clice")}}
+    await c.initialize(workspace, initialization_options=init_options)
+
+    uri, _ = await c.open_and_wait(workspace / "main.cpp")
+    assert await wait_for_index(c, uri, "add"), "Index not ready"
+
+    rpc = AgenticRpcClient(host, port)
+
+    for _ in range(30):
+        resp = rpc.request("agentic/symbolSearch", {"query": "add"})
+        if "result" in resp and resp["result"]["symbols"]:
+            break
+        await asyncio.sleep(1)
+    else:
+        pytest.fail("agentic/symbolSearch never returned indexed symbols")
+
+    yield rpc, workspace
+
+    rpc.close()
+    c.close(uri)
+    await _shutdown_client(c)
+
+
+@pytest.mark.workspace("index_features")
+async def test_rpc_compile_command(indexed_agentic, workspace):
+    rpc, _ = indexed_agentic
+    path = (workspace / "main.cpp").as_posix()
+    resp = rpc.request("agentic/compileCommand", {"path": path})
+    assert "result" in resp, f"unexpected response: {resp}"
+    result = resp["result"]
+    assert result["file"] == path
+    assert len(result["arguments"]) > 0
+
+
+@pytest.mark.workspace("index_features")
+async def test_rpc_project_files(indexed_agentic, workspace):
+    rpc, _ = indexed_agentic
+    resp = rpc.request("agentic/projectFiles", {})
+    assert "result" in resp, f"unexpected response: {resp}"
+    result = resp["result"]
+    assert result["total"] > 0
+    paths = [f["path"] for f in result["files"]]
+    assert any("main.cpp" in p for p in paths)
+
+
+@pytest.mark.workspace("index_features")
+async def test_rpc_project_files_filter(indexed_agentic, workspace):
+    rpc, _ = indexed_agentic
+    resp = rpc.request("agentic/projectFiles", {"filter": "source"})
+    assert "result" in resp
+    for f in resp["result"]["files"]:
+        assert f["kind"] == "source"
+
+
+@pytest.mark.workspace("index_features")
+async def test_rpc_symbol_search(indexed_agentic, workspace):
+    rpc, _ = indexed_agentic
+    resp = rpc.request("agentic/symbolSearch", {"query": "add"})
+    assert "result" in resp, f"unexpected response: {resp}"
+    symbols = resp["result"]["symbols"]
+    add_sym = next((s for s in symbols if s["name"] == "add"), None)
+    assert add_sym is not None, f"'add' not found in {[s['name'] for s in symbols]}"
+    assert add_sym["kind"] == "Function"
+    assert add_sym["line"] == 19
+    assert add_sym["symbolId"] != 0
+    assert "main.cpp" in add_sym["file"]
+
+
+@pytest.mark.workspace("index_features")
+async def test_rpc_symbol_search_kind(indexed_agentic, workspace):
+    rpc, _ = indexed_agentic
+    resp = rpc.request(
+        "agentic/symbolSearch", {"query": "Animal", "kindFilter": ["Struct"]}
+    )
+    assert "result" in resp
+    for s in resp["result"]["symbols"]:
+        assert s["kind"] == "Struct"
+
+
+@pytest.mark.workspace("index_features")
+async def test_rpc_symbol_search_max(indexed_agentic, workspace):
+    rpc, _ = indexed_agentic
+    resp = rpc.request("agentic/symbolSearch", {"query": "", "maxResults": 3})
+    assert "result" in resp
+    assert len(resp["result"]["symbols"]) <= 3
+
+
+@pytest.mark.workspace("index_features")
+async def test_rpc_read_symbol(indexed_agentic, workspace):
+    rpc, _ = indexed_agentic
+    resp = rpc.request("agentic/readSymbol", {"name": "add"})
+    assert "result" in resp, f"unexpected response: {resp}"
+    result = resp["result"]
+    assert result["name"] == "add"
+    assert result["symbolId"] != 0
+    assert result["startLine"] == 19
+    assert result["endLine"] == 21
+    assert "int add(int a, int b)" in result["text"]
+    assert "return a + b;" in result["text"]
+
+
+@pytest.mark.workspace("index_features")
+async def test_rpc_read_symbol_by_id(indexed_agentic, workspace):
+    rpc, _ = indexed_agentic
+    resp1 = rpc.request("agentic/readSymbol", {"name": "add"})
+    assert "result" in resp1
+    sid = resp1["result"]["symbolId"]
+
+    resp2 = rpc.request("agentic/readSymbol", {"symbolId": sid})
+    assert "result" in resp2
+    assert resp2["result"]["name"] == "add"
+    assert resp2["result"]["symbolId"] == sid
+
+
+@pytest.mark.workspace("index_features")
+async def test_rpc_document_symbols(indexed_agentic, workspace):
+    rpc, _ = indexed_agentic
+    path = (workspace / "main.cpp").as_posix()
+    resp = rpc.request("agentic/documentSymbols", {"path": path})
+    assert "result" in resp, f"unexpected response: {resp}"
+    symbols = resp["result"]["symbols"]
+    names = [s["name"] for s in symbols]
+    kinds = [s["kind"] for s in symbols]
+    assert "add" in names, f"expected 'add' in {names}"
+    assert "main" in names, f"expected 'main' in {names}"
+    assert "global_var" in names, f"expected 'global_var' in {names}"
+    assert "Parameter" not in kinds, (
+        f"Parameters should be filtered: {list(zip(names, kinds))}"
+    )
+
+
+@pytest.mark.workspace("index_features")
+async def test_rpc_definition(indexed_agentic, workspace):
+    rpc, _ = indexed_agentic
+    resp = rpc.request("agentic/definition", {"name": "add"})
+    assert "result" in resp, f"unexpected response: {resp}"
+    result = resp["result"]
+    assert result["name"] == "add"
+    assert result["definition"] is not None
+    defn = result["definition"]
+    assert "main.cpp" in defn["file"]
+    assert defn["startLine"] == 19
+    assert defn["endLine"] == 21
+    assert "int add(int a, int b)" in defn["text"]
+    assert "return a + b;" in defn["text"]
+
+
+@pytest.mark.workspace("index_features")
+async def test_rpc_definition_by_position(indexed_agentic, workspace):
+    rpc, _ = indexed_agentic
+    path = (workspace / "main.cpp").as_posix()
+    resp = rpc.request("agentic/definition", {"path": path, "line": 19})
+    assert "result" in resp, f"unexpected response: {resp}"
+    assert resp["result"]["name"] == "add"
+
+
+@pytest.mark.workspace("index_features")
+async def test_rpc_references(indexed_agentic, workspace):
+    rpc, _ = indexed_agentic
+    resp = rpc.request("agentic/references", {"name": "global_var"})
+    assert "result" in resp, f"unexpected response: {resp}"
+    result = resp["result"]
+    assert result["name"] == "global_var"
+    assert result["total"] == 2
+    lines = sorted(r["line"] for r in result["references"])
+    assert lines == [34, 38]
+    contexts = [r["context"] for r in result["references"]]
+    assert any("global_var + 1" in c for c in contexts)
+    assert any("global_var * 2" in c for c in contexts)
+
+
+@pytest.mark.workspace("index_features")
+async def test_rpc_references_include_decl(indexed_agentic, workspace):
+    rpc, _ = indexed_agentic
+    resp = rpc.request(
+        "agentic/references", {"name": "global_var", "includeDeclaration": True}
+    )
+    assert "result" in resp
+    result = resp["result"]
+    assert result["total"] == 3
+    lines = sorted(r["line"] for r in result["references"])
+    assert 31 in lines, f"expected declaration line 31 in {lines}"
+
+
+@pytest.mark.workspace("index_features")
+async def test_rpc_call_graph_incoming(indexed_agentic, workspace):
+    rpc, _ = indexed_agentic
+    resp = rpc.request("agentic/callGraph", {"name": "add", "direction": "callers"})
+    assert "result" in resp, f"unexpected response: {resp}"
+    result = resp["result"]
+    assert result["root"]["name"] == "add"
+    assert result["root"]["line"] == 19
+    assert result["root"]["symbolId"] != 0
+    callers = result["callers"]
+    caller_names = [c["name"] for c in callers]
+    assert "compute" in caller_names, f"expected 'compute' in {caller_names}"
+    compute = next(c for c in callers if c["name"] == "compute")
+    assert compute["line"] == 24
+    assert compute["symbolId"] != 0
+    assert result["callees"] == []
+
+
+@pytest.mark.workspace("index_features")
+async def test_rpc_call_graph_outgoing(indexed_agentic, workspace):
+    rpc, _ = indexed_agentic
+    resp = rpc.request("agentic/callGraph", {"name": "compute", "direction": "callees"})
+    assert "result" in resp, f"unexpected response: {resp}"
+    result = resp["result"]
+    assert result["root"]["name"] == "compute"
+    callees = result["callees"]
+    callee_names = [c["name"] for c in callees]
+    assert "add" in callee_names, f"expected 'add' in {callee_names}"
+    add_entry = next(c for c in callees if c["name"] == "add")
+    assert add_entry["line"] == 19
+    assert result["callers"] == []
+
+
+@pytest.mark.workspace("index_features")
+async def test_rpc_type_hierarchy_supertypes(indexed_agentic, workspace):
+    rpc, _ = indexed_agentic
+    resp = rpc.request(
+        "agentic/typeHierarchy", {"name": "Dog", "direction": "supertypes"}
+    )
+    assert "result" in resp, f"unexpected response: {resp}"
+    result = resp["result"]
+    assert result["root"]["name"] == "Dog"
+    assert result["root"]["line"] == 9
+    supertypes = result["supertypes"]
+    supertype_names = [t["name"] for t in supertypes]
+    assert "Animal" in supertype_names, f"expected 'Animal' in {supertype_names}"
+    animal = next(t for t in supertypes if t["name"] == "Animal")
+    assert animal["line"] == 2
+    assert animal["symbolId"] != 0
+
+
+@pytest.mark.workspace("index_features")
+async def test_rpc_type_hierarchy_subtypes(indexed_agentic, workspace):
+    rpc, _ = indexed_agentic
+    resp = rpc.request(
+        "agentic/typeHierarchy", {"name": "Animal", "direction": "subtypes"}
+    )
+    assert "result" in resp, f"unexpected response: {resp}"
+    result = resp["result"]
+    assert result["root"]["name"] == "Animal"
+    assert result["root"]["line"] == 2
+    subtypes = result["subtypes"]
+    subtype_names = [t["name"] for t in subtypes]
+    assert "Dog" in subtype_names, f"expected 'Dog' in {subtype_names}"
+    assert "Cat" in subtype_names, f"expected 'Cat' in {subtype_names}"
+    dog = next(t for t in subtypes if t["name"] == "Dog")
+    assert dog["line"] == 9
+    cat = next(t for t in subtypes if t["name"] == "Cat")
+    assert cat["line"] == 14
+
+
+@pytest.mark.workspace("index_features")
+async def test_rpc_status(indexed_agentic, workspace):
+    rpc, _ = indexed_agentic
+    resp = rpc.request("agentic/status", {})
+    assert "result" in resp, f"unexpected response: {resp}"
+    result = resp["result"]
+    assert isinstance(result["idle"], bool)
+    assert result["total"] > 0
+    assert isinstance(result["pending"], int)
+    assert isinstance(result["indexed"], int)
+
+
+@pytest.mark.workspace("hello_world")
+async def test_rpc_shutdown(executable, workspace):
+    """Shutdown notification should cause the server to exit."""
+    from tests.integration.utils.client import CliceClient
+    from tests.conftest import _shutdown_client, _find_free_port
+
+    host = "127.0.0.1"
+    port = _find_free_port()
+    cmd = [str(executable), "--mode", "pipe", "--host", host, "--port", str(port)]
+
+    c = CliceClient()
+    await c.start_io(*cmd)
+    init_options = {"project": {"cache_dir": str(workspace / ".clice")}}
+    await c.initialize(workspace, initialization_options=init_options)
+
+    rpc = AgenticRpcClient(host, port)
+    body = json.dumps({"jsonrpc": "2.0", "method": "agentic/shutdown", "params": {}})
+    rpc.sock.sendall(f"Content-Length: {len(body)}\r\n\r\n{body}".encode())
+    rpc.sock.settimeout(5)
+    try:
+        rpc.sock.recv(4096)
+    except (socket.timeout, OSError):
+        pass
+    rpc.sock.close()
+
+    import asyncio
+
+    for _ in range(20):
+        if c._server.returncode is not None:
+            break
+        await asyncio.sleep(0.5)
+    assert c._server.returncode is not None, "Server did not exit after shutdown"
+
+
+@pytest.mark.workspace("index_features")
+async def test_rpc_symbol_not_found(indexed_agentic, workspace):
+    rpc, _ = indexed_agentic
+    resp = rpc.request("agentic/definition", {"name": "nonexistent_symbol_xyz"})
+    assert "error" in resp
+
+
+@pytest.mark.workspace("index_features")
+async def test_rpc_symbol_id_roundtrip(indexed_agentic, workspace):
+    """Search -> get symbolId -> definition -> verify consistency."""
+    rpc, _ = indexed_agentic
+    search = rpc.request("agentic/symbolSearch", {"query": "compute"})
+    assert "result" in search
+    symbols = search["result"]["symbols"]
+    compute = next((s for s in symbols if s["name"] == "compute"), None)
+    assert compute is not None, f"'compute' not found in {[s['name'] for s in symbols]}"
+
+    defn = rpc.request("agentic/definition", {"symbolId": compute["symbolId"]})
+    assert "result" in defn
+    assert defn["result"]["name"] == "compute"
+    assert defn["result"]["symbolId"] == compute["symbolId"]
+
+
+@pytest.mark.workspace("index_features")
+async def test_rpc_file_deps(indexed_agentic, workspace):
+    rpc, _ = indexed_agentic
+    path = (workspace / "main.cpp").as_posix()
+    resp = rpc.request("agentic/fileDeps", {"path": path})
+    assert "result" in resp, f"unexpected response: {resp}"
+    result = resp["result"]
+    assert result["file"] == path
+    assert isinstance(result["includes"], list)
+    assert isinstance(result["includers"], list)
+
+
+@pytest.mark.workspace("index_features")
+async def test_rpc_file_deps_direction(indexed_agentic, workspace):
+    rpc, _ = indexed_agentic
+    path = (workspace / "main.cpp").as_posix()
+    resp = rpc.request("agentic/fileDeps", {"path": path, "direction": "includes"})
+    assert "result" in resp
+    assert resp["result"]["includers"] == []
+
+
+@pytest.mark.workspace("index_features")
+async def test_rpc_file_deps_unknown(indexed_agentic, workspace):
+    rpc, _ = indexed_agentic
+    resp = rpc.request("agentic/fileDeps", {"path": "/nonexistent/file.cpp"})
+    assert "result" in resp
+    assert resp["result"]["includes"] == []
+    assert resp["result"]["includers"] == []
+
+
+@pytest.mark.workspace("index_features")
+async def test_rpc_impact_analysis(indexed_agentic, workspace):
+    rpc, _ = indexed_agentic
+    path = (workspace / "main.cpp").as_posix()
+    resp = rpc.request("agentic/impactAnalysis", {"path": path})
+    assert "result" in resp, f"unexpected response: {resp}"
+    result = resp["result"]
+    assert isinstance(result["directDependents"], list)
+    assert isinstance(result["transitiveDependents"], list)
+    assert isinstance(result["affectedModules"], list)
+
+
+@pytest.mark.workspace("index_features")
+async def test_rpc_impact_analysis_unknown(indexed_agentic, workspace):
+    rpc, _ = indexed_agentic
+    resp = rpc.request("agentic/impactAnalysis", {"path": "/nonexistent/file.cpp"})
+    assert "result" in resp
+    assert resp["result"]["directDependents"] == []
+
+
+async def test_shutdown_during_indexing(executable, tmp_path):
+    """Shutdown during active background indexing must exit cleanly."""
+    from tests.integration.utils.client import CliceClient
+    from tests.conftest import _find_free_port
+
+    workspace = tmp_path / "ws"
+    workspace.mkdir()
+
+    entries = []
+    for i in range(20):
+        src = workspace / f"file_{i}.cpp"
+        src.write_text(
+            f"struct Type_{i} {{ int v = {i}; void m() {{}} }};\n"
+            f"int func_{i}(int x) {{ return x + {i}; }}\n"
+            f"int caller_{i}() {{ return func_{i}({i}); }}\n"
+        )
+        entries.append(
+            {
+                "directory": workspace.as_posix(),
+                "file": src.as_posix(),
+                "arguments": ["clang++", "-std=c++17", "-fsyntax-only", src.as_posix()],
+            }
+        )
+
+    (workspace / "compile_commands.json").write_text(json.dumps(entries))
+
+    host = "127.0.0.1"
+    port = _find_free_port()
+    cmd = [str(executable), "--mode", "pipe", "--host", host, "--port", str(port)]
+
+    c = CliceClient()
+    await c.start_io(*cmd)
+
+    init_options = {
+        "project": {
+            "cache_dir": str(workspace / ".clice"),
+            "idle_timeout_ms": 0,
+        }
+    }
+    await c.initialize(workspace, initialization_options=init_options)
+
+    # Give indexing a moment to start, then send shutdown
+    await asyncio.sleep(0.5)
+
+    rpc = AgenticRpcClient(host, port)
+    body = json.dumps({"jsonrpc": "2.0", "method": "agentic/shutdown", "params": {}})
+    rpc.sock.sendall(f"Content-Length: {len(body)}\r\n\r\n{body}".encode())
+    rpc.sock.settimeout(5)
+    try:
+        rpc.sock.recv(4096)
+    except (socket.timeout, OSError):
+        pass
+    rpc.sock.close()
+
+    for _ in range(30):
+        if c._server.returncode is not None:
+            break
+        await asyncio.sleep(0.5)
+
+    assert c._server.returncode is not None, "Server did not exit after shutdown"
+    assert c._server.returncode >= 0, (
+        f"Server crashed with signal {-c._server.returncode}"
+    )

tests/integration/agentic/test_cli.py

@@ -0,0 +1,189 @@
+"""CLI-based tests for agentic mode — run clice --mode agentic as a subprocess."""
+
+import json
+import subprocess
+
+import pytest
+
+from tests.integration.utils.wait import wait_for_index
+
+
+def run_cli(executable, host, port, method, **kwargs):
+    cmd = [
+        str(executable),
+        "--mode",
+        "agentic",
+        "--host",
+        host,
+        "--port",
+        str(port),
+        "--method",
+        method,
+    ]
+    for k, v in kwargs.items():
+        cmd.extend([f"--{k}", str(v)])
+    result = subprocess.run(cmd, capture_output=True, text=True, timeout=10)
+    return result
+
+
+@pytest.fixture
+async def indexed_server(request, executable, workspace):
+    """Start server with LSP+agentic, compile a file, wait for indexing."""
+    import asyncio
+    from tests.integration.utils.client import CliceClient
+    from tests.conftest import _shutdown_client, _find_free_port
+
+    host = "127.0.0.1"
+    port = _find_free_port()
+    cmd = [str(executable), "--mode", "pipe", "--host", host, "--port", str(port)]
+
+    c = CliceClient()
+    await c.start_io(*cmd)
+
+    init_options = {"project": {"cache_dir": str(workspace / ".clice")}}
+    await c.initialize(workspace, initialization_options=init_options)
+
+    uri, _ = await c.open_and_wait(workspace / "main.cpp")
+    assert await wait_for_index(c, uri, "add"), "Index not ready"
+
+    from tests.integration.agentic.test_agentic import AgenticRpcClient
+
+    rpc = AgenticRpcClient(host, port)
+    for _ in range(30):
+        resp = rpc.request("agentic/symbolSearch", {"query": "add"})
+        if "result" in resp and resp["result"]["symbols"]:
+            break
+        await asyncio.sleep(1)
+    rpc.close()
+
+    yield executable, host, port, workspace
+
+    c.close(uri)
+    await _shutdown_client(c)
+
+
+@pytest.mark.workspace("index_features")
+async def test_cli_compile_command(indexed_server, workspace):
+    exe, host, port, _ = indexed_server
+    path = (workspace / "main.cpp").as_posix()
+    r = run_cli(exe, host, port, "compileCommand", path=path)
+    assert r.returncode == 0, f"stderr: {r.stderr}"
+    data = json.loads(r.stdout)
+    assert data["file"] == path
+    assert len(data["arguments"]) > 0
+
+
+@pytest.mark.workspace("index_features")
+async def test_cli_symbol_search(indexed_server, workspace):
+    exe, host, port, _ = indexed_server
+    r = run_cli(exe, host, port, "symbolSearch", query="add")
+    assert r.returncode == 0, f"stderr: {r.stderr}"
+    data = json.loads(r.stdout)
+    names = [s["name"] for s in data["symbols"]]
+    assert "add" in names
+    add_sym = next(s for s in data["symbols"] if s["name"] == "add")
+    assert add_sym["kind"] == "Function"
+    assert add_sym["line"] == 19
+
+
+@pytest.mark.workspace("index_features")
+async def test_cli_definition(indexed_server, workspace):
+    exe, host, port, _ = indexed_server
+    r = run_cli(exe, host, port, "definition", name="add")
+    assert r.returncode == 0, f"stderr: {r.stderr}"
+    data = json.loads(r.stdout)
+    assert data["name"] == "add"
+    defn = data["definition"]
+    assert defn["startLine"] == 19
+    assert defn["endLine"] == 21
+    assert "return a + b;" in defn["text"]
+
+
+@pytest.mark.workspace("index_features")
+async def test_cli_definition_by_position(indexed_server, workspace):
+    exe, host, port, _ = indexed_server
+    path = (workspace / "main.cpp").as_posix()
+    r = run_cli(exe, host, port, "definition", path=path, line=19)
+    assert r.returncode == 0, f"stderr: {r.stderr}"
+    data = json.loads(r.stdout)
+    assert data["name"] == "add"
+
+
+@pytest.mark.workspace("index_features")
+async def test_cli_references(indexed_server, workspace):
+    exe, host, port, _ = indexed_server
+    r = run_cli(exe, host, port, "references", name="global_var")
+    assert r.returncode == 0, f"stderr: {r.stderr}"
+    data = json.loads(r.stdout)
+    assert data["name"] == "global_var"
+    assert data["total"] == 2
+    lines = sorted(ref["line"] for ref in data["references"])
+    assert lines == [34, 38]
+
+
+@pytest.mark.workspace("index_features")
+async def test_cli_read_symbol(indexed_server, workspace):
+    exe, host, port, _ = indexed_server
+    r = run_cli(exe, host, port, "readSymbol", name="compute")
+    assert r.returncode == 0, f"stderr: {r.stderr}"
+    data = json.loads(r.stdout)
+    assert data["name"] == "compute"
+    assert "add(1, 2)" in data["text"]
+
+
+@pytest.mark.workspace("index_features")
+async def test_cli_document_symbols(indexed_server, workspace):
+    exe, host, port, _ = indexed_server
+    path = (workspace / "main.cpp").as_posix()
+    r = run_cli(exe, host, port, "documentSymbols", path=path)
+    assert r.returncode == 0, f"stderr: {r.stderr}"
+    data = json.loads(r.stdout)
+    names = [s["name"] for s in data["symbols"]]
+    assert "add" in names
+    assert "main" in names
+    assert "global_var" in names
+
+
+@pytest.mark.workspace("index_features")
+async def test_cli_call_graph(indexed_server, workspace):
+    exe, host, port, _ = indexed_server
+    r = run_cli(exe, host, port, "callGraph", name="add", direction="callers")
+    assert r.returncode == 0, f"stderr: {r.stderr}"
+    data = json.loads(r.stdout)
+    assert data["root"]["name"] == "add"
+    caller_names = [c["name"] for c in data["callers"]]
+    assert "compute" in caller_names
+
+
+@pytest.mark.workspace("index_features")
+async def test_cli_type_hierarchy(indexed_server, workspace):
+    exe, host, port, _ = indexed_server
+    r = run_cli(exe, host, port, "typeHierarchy", name="Dog", direction="supertypes")
+    assert r.returncode == 0, f"stderr: {r.stderr}"
+    data = json.loads(r.stdout)
+    assert data["root"]["name"] == "Dog"
+    supertype_names = [t["name"] for t in data["supertypes"]]
+    assert "Animal" in supertype_names
+
+
+@pytest.mark.workspace("index_features")
+async def test_cli_project_files(indexed_server, workspace):
+    exe, host, port, _ = indexed_server
+    r = run_cli(exe, host, port, "projectFiles")
+    assert r.returncode == 0, f"stderr: {r.stderr}"
+    data = json.loads(r.stdout)
+    assert data["total"] > 0
+    paths = [f["path"] for f in data["files"]]
+    assert any("main.cpp" in p for p in paths)
+
+
+@pytest.mark.workspace("index_features")
+async def test_cli_status(indexed_server, workspace):
+    exe, host, port, _ = indexed_server
+    r = run_cli(exe, host, port, "status")
+    assert r.returncode == 0, f"stderr: {r.stderr}"
+    data = json.loads(r.stdout)
+    assert isinstance(data["idle"], bool)
+    assert data["total"] > 0
+    assert isinstance(data["pending"], int)
+    assert isinstance(data["indexed"], int)

tests/integration/compilation/test_persistent_cache.py

@@ -24,9 +24,17 @@ from tests.integration.utils.cache import (
 from tests.integration.utils.assertions import assert_clean_compile
 
 
+def _pin_cache_to_workspace(tmp_path):
+    """Write a clice.toml that pins cache_dir to <workspace>/.clice/."""
+    (tmp_path / "clice.toml").write_text(
+        '[project]\ncache_dir = "${workspace}/.clice"\n'
+    )
+
+
 async def test_pch_written_to_cache_dir(client, tmp_path):
     """After opening a file with #include, a .pch file should appear
     in .clice/cache/pch/ with a hex-hash filename."""
+    _pin_cache_to_workspace(tmp_path)
     (tmp_path / "header.h").write_text("#pragma once\nstruct Foo { int x; };\n")
     (tmp_path / "main.cpp").write_text(
         '#include "header.h"\nint main() { Foo f; return f.x; }\n'
@@ -48,6 +56,7 @@ async def test_pch_written_to_cache_dir(client, tmp_path):
 
 async def test_cache_json_persisted(client, tmp_path):
     """After a PCH build, cache.json should be written with the entry."""
+    _pin_cache_to_workspace(tmp_path)
     (tmp_path / "header.h").write_text("#pragma once\nint global_val = 42;\n")
     (tmp_path / "main.cpp").write_text(
         '#include "header.h"\nint main() { return global_val; }\n'
@@ -74,6 +83,7 @@ async def test_cache_json_persisted(client, tmp_path):
 async def test_pch_reused_on_close_reopen(client, tmp_path):
     """Closing and reopening a file within the same session should reuse
     the cached PCH — no additional .pch files should be created."""
+    _pin_cache_to_workspace(tmp_path)
     (tmp_path / "header.h").write_text("#pragma once\nstruct Bar { int y; };\n")
     (tmp_path / "main.cpp").write_text(
         '#include "header.h"\nint main() { Bar b; return b.y; }\n'
@@ -108,6 +118,7 @@ async def test_pch_reused_on_close_reopen(client, tmp_path):
 async def test_pch_survives_server_restart(executable, tmp_path):
     """PCH cache should survive a full server restart — cache.json is
     loaded on startup and the existing .pch file is reused."""
+    _pin_cache_to_workspace(tmp_path)
     (tmp_path / "header.h").write_text("#pragma once\nstruct Baz { int z; };\n")
     (tmp_path / "main.cpp").write_text(
         '#include "header.h"\nint main() { Baz b; return b.z; }\n'
@@ -150,6 +161,7 @@ async def test_pch_survives_server_restart(executable, tmp_path):
 async def test_shared_preamble_shares_pch(client, tmp_path):
     """Two files with identical preambles should share the same PCH file
     (content-addressed by preamble hash)."""
+    _pin_cache_to_workspace(tmp_path)
     (tmp_path / "header.h").write_text("#pragma once\nint shared_val = 1;\n")
     (tmp_path / "a.cpp").write_text(
         '#include "header.h"\nint fa() { return shared_val; }\n'
@@ -176,6 +188,7 @@ async def test_shared_preamble_shares_pch(client, tmp_path):
 
 async def test_different_preamble_different_pch(client, tmp_path):
     """Files with different preambles should produce different PCH files."""
+    _pin_cache_to_workspace(tmp_path)
     (tmp_path / "a.h").write_text("#pragma once\nint val_a = 1;\n")
     (tmp_path / "b.h").write_text("#pragma once\nint val_b = 2;\n")
     (tmp_path / "a.cpp").write_text('#include "a.h"\nint fa() { return val_a; }\n')
@@ -199,6 +212,7 @@ async def test_different_preamble_different_pch(client, tmp_path):
 async def test_pch_rebuilt_on_header_change(client, tmp_path):
     """When a preamble header changes, a new PCH should be built
     (different hash → different filename). The old one remains for cleanup."""
+    _pin_cache_to_workspace(tmp_path)
     (tmp_path / "header.h").write_text("#pragma once\nstruct V1 { int a; };\n")
     (tmp_path / "main.cpp").write_text(
         '#include "header.h"\nint main() { V1 v; return v.a; }\n'
@@ -240,6 +254,7 @@ async def test_pch_rebuilt_on_header_change(client, tmp_path):
 
 async def test_no_tmp_files_after_build(client, tmp_path):
     """After a successful PCH build, no .tmp files should remain in the cache dir."""
+    _pin_cache_to_workspace(tmp_path)
     (tmp_path / "header.h").write_text("#pragma once\nint val = 1;\n")
     (tmp_path / "main.cpp").write_text(
         '#include "header.h"\nint main() { return val; }\n'
@@ -265,6 +280,7 @@ async def test_no_tmp_files_after_build(client, tmp_path):
 async def test_cache_dirs_created_on_startup(client, tmp_path):
     """The .clice/cache/pch/ and .clice/cache/pcm/ directories should be created
     when the server initializes a workspace."""
+    _pin_cache_to_workspace(tmp_path)
     (tmp_path / "main.cpp").write_text("int main() { return 0; }\n")
     write_cdb(tmp_path, ["main.cpp"])
     await client.initialize(tmp_path)

tests/integration/features/test_formatting.py

@@ -0,0 +1,74 @@
+import pytest
+from lsprotocol.types import Position, Range
+
+from tests.integration.utils.workspace import did_change
+
+UNFORMATTED = "int    add(   int   a  ,  int   b  ) {\nreturn   a+b ;\n}\n"
+FORMATTED = "int add(int a, int b) { return a + b; }\n"
+
+
+def apply_edits(text, edits):
+    """Apply LSP TextEdits to a string, processing from end to start."""
+    lines = text.split("\n")
+    for edit in sorted(
+        edits, key=lambda e: (e.range.start.line, e.range.start.character), reverse=True
+    ):
+        start = edit.range.start
+        end = edit.range.end
+        before = (
+            "\n".join(lines[: start.line])
+            + ("\n" if start.line > 0 else "")
+            + lines[start.line][: start.character]
+        )
+        after = (
+            lines[end.line][end.character :]
+            + ("\n" if end.line < len(lines) - 1 else "")
+            + "\n".join(lines[end.line + 1 :])
+        )
+        text = before + edit.new_text + after
+        lines = text.split("\n")
+    return text
+
+
+@pytest.mark.workspace("formatting")
+async def test_format_document(client, workspace):
+    uri, _ = await client.open_and_wait(workspace / "main.cpp")
+
+    did_change(client, uri, 1, UNFORMATTED)
+    edits = await client.format_document(uri)
+
+    assert edits is not None
+    assert len(edits) > 0
+    result = apply_edits(UNFORMATTED, edits)
+    assert result == FORMATTED
+
+    client.close(uri)
+
+
+@pytest.mark.workspace("formatting")
+async def test_format_range(client, workspace):
+    uri, _ = await client.open_and_wait(workspace / "main.cpp")
+
+    did_change(client, uri, 1, UNFORMATTED)
+    edits = await client.format_range(
+        uri,
+        Range(start=Position(line=1, character=0), end=Position(line=2, character=0)),
+    )
+
+    assert edits is not None
+    assert len(edits) > 0
+
+    client.close(uri)
+
+
+@pytest.mark.workspace("formatting")
+async def test_format_already_formatted(client, workspace):
+    uri, _ = await client.open_and_wait(workspace / "main.cpp")
+
+    did_change(client, uri, 1, FORMATTED)
+    edits = await client.format_document(uri)
+
+    assert edits is not None
+    assert len(edits) == 0
+
+    client.close(uri)

tests/integration/features/test_server.py

@@ -34,6 +34,8 @@ async def test_capabilities(client, workspace):
     assert capability_enabled(caps.folding_range_provider)
     assert capability_enabled(caps.inlay_hint_provider)
     assert capability_enabled(caps.code_action_provider)
+    assert caps.document_formatting_provider is True
+    assert caps.document_range_formatting_provider is True
     assert caps.semantic_tokens_provider is not None
 
 

tests/integration/lifecycle/test_config.py

@@ -0,0 +1,68 @@
+"""Integration tests for clice configuration (clice.toml + initializationOptions).
+
+Each workspace's main.cpp references a macro that is only defined when the
+rule's `-D<macro>=...` is applied. When rules are applied, compilation is
+clean; otherwise an undeclared-identifier diagnostic surfaces.
+"""
+
+import pytest
+
+from tests.integration.utils.assertions import (
+    assert_clean_compile,
+    assert_has_errors,
+    get_errors,
+)
+
+
+@pytest.mark.workspace("config_rules_no_config")
+async def test_baseline_without_rules(client, workspace):
+    uri, _ = await client.open_and_wait(workspace / "main.cpp")
+    assert_has_errors(client, uri, "Expected diagnostics without any rules applied")
+    errors = get_errors(client.diagnostics[uri])
+    assert any("FROM_INIT" in (d.message or "") for d in errors), (
+        f"Expected a diagnostic referencing FROM_INIT, got: {errors}"
+    )
+
+
+@pytest.mark.workspace("config_rules_toml")
+async def test_rules_from_toml(client, workspace):
+    uri, _ = await client.open_and_wait(workspace / "main.cpp")
+    assert_clean_compile(client, uri)
+
+    symbols = await client.document_symbols(uri)
+    assert symbols, "Expected document symbols for value()/main()"
+    hover = await client.hover_at(uri, line=4, character=4)  # on 'main'
+    assert hover is not None
+
+
+@pytest.mark.workspace("config_rules_no_config")
+@pytest.mark.init_options(
+    {"rules": [{"patterns": ["**/*.cpp"], "append": ["-DFROM_INIT=1"]}]}
+)
+async def test_rules_from_init_options(client, workspace):
+    uri, _ = await client.open_and_wait(workspace / "main.cpp")
+    assert_clean_compile(client, uri)
+
+
+@pytest.mark.workspace("config_rules_toml")
+@pytest.mark.init_options(
+    {"rules": [{"patterns": ["**/*.cpp"], "append": ["-DUNRELATED"]}]}
+)
+async def test_init_options_replaces_toml_rules(client, workspace):
+    uri, _ = await client.open_and_wait(workspace / "main.cpp")
+    assert_has_errors(
+        client, uri, "initializationOptions should have overridden clice.toml rules"
+    )
+    errors = get_errors(client.diagnostics[uri])
+    assert any("FROM_TOML" in (d.message or "") for d in errors), (
+        f"Expected FROM_TOML diagnostic after override, got: {errors}"
+    )
+
+
+@pytest.mark.workspace("config_rules_no_config")
+@pytest.mark.init_options(
+    {"rules": [{"patterns": ["**/does_not_match.cpp"], "append": ["-DFROM_INIT=1"]}]}
+)
+async def test_rules_pattern_mismatch(client, workspace):
+    uri, _ = await client.open_and_wait(workspace / "main.cpp")
+    assert_has_errors(client, uri, "Rule pattern should not have matched main.cpp")

tests/integration/utils/client.py

@@ -16,9 +16,12 @@ from lsprotocol.types import (
     Diagnostic,
     DidCloseTextDocumentParams,
     DidOpenTextDocumentParams,
+    DocumentFormattingParams,
     DocumentLinkParams,
+    DocumentRangeFormattingParams,
     DocumentSymbolParams,
     FoldingRangeParams,
+    FormattingOptions,
     HoverParams,
     InlayHintParams,
     InitializeParams,
@@ -86,16 +89,25 @@ class CliceClient(BaseLanguageClient):
 
     # ── Lifecycle ────────────────────────────────────────────────────
 
-    async def initialize(self, workspace: Path) -> InitializeResult:
-        result = await self.initialize_async(
-            InitializeParams(
-                capabilities=ClientCapabilities(),
-                root_uri=workspace.as_uri(),
-                workspace_folders=[
-                    WorkspaceFolder(uri=workspace.as_uri(), name="test")
-                ],
-            )
+    async def initialize(
+        self,
+        workspace: Path,
+        *,
+        initialization_options: dict | None = None,
+    ) -> InitializeResult:
+        if initialization_options is None:
+            initialization_options = {}
+        project = dict(initialization_options.get("project", {}))
+        project.setdefault("cache_dir", str(workspace / ".clice"))
+        initialization_options["project"] = project
+
+        params = InitializeParams(
+            capabilities=ClientCapabilities(),
+            root_uri=workspace.as_uri(),
+            workspace_folders=[WorkspaceFolder(uri=workspace.as_uri(), name="test")],
         )
+        params.initialization_options = initialization_options
+        result = await self.initialize_async(params)
         self.initialized(InitializedParams())
         self.init_result = result
         return result
@@ -303,6 +315,29 @@ class CliceClient(BaseLanguageClient):
             timeout=timeout,
         )
 
+    async def format_document(self, uri: str, *, timeout: float = 30.0):
+        return await asyncio.wait_for(
+            self.text_document_formatting_async(
+                DocumentFormattingParams(
+                    text_document=TextDocumentIdentifier(uri=uri),
+                    options=FormattingOptions(tab_size=4, insert_spaces=True),
+                )
+            ),
+            timeout=timeout,
+        )
+
+    async def format_range(self, uri: str, range_: Range, *, timeout: float = 30.0):
+        return await asyncio.wait_for(
+            self.text_document_range_formatting_async(
+                DocumentRangeFormattingParams(
+                    text_document=TextDocumentIdentifier(uri=uri),
+                    range=range_,
+                    options=FormattingOptions(tab_size=4, insert_spaces=True),
+                )
+            ),
+            timeout=timeout,
+        )
+
     # ── Extension protocol ───────────────────────────────────────────
 
     async def query_context(self, uri: str, *, timeout: float = 30.0):

tests/pytest.ini

@@ -1,3 +1,5 @@
 [pytest]
 asyncio_mode = auto
-markers = workspace
+markers =
+    workspace
+    init_options

tests/replay.py

@@ -13,6 +13,9 @@ import re
 import signal
 import sys
 import time
+
+# Force line-buffered stdout so CI sees output immediately.
+sys.stdout.reconfigure(line_buffering=True)
 from pathlib import Path
 from urllib.parse import quote, unquote
 
@@ -109,7 +112,9 @@ async def write_lsp_message(writer: asyncio.StreamWriter, payload: str):
     await writer.drain()
 
 
-async def replay_one(trace_path: Path, clice_bin: Path, timeout: int) -> bool | None:
+async def replay_one(
+    trace_path: Path, clice_bin: Path, timeout: int, wall_timeout: int = 300
+) -> bool | None:
     """Replay a single trace. Returns True=PASS, False=FAIL, None=SKIP."""
     records = load_trace(trace_path)
     if not records:
@@ -179,8 +184,21 @@ async def replay_one(trace_path: Path, clice_bin: Path, timeout: int) -> bool |
     last_method = None
     sent_count = 0
 
+    wall_deadline = wall_start + wall_timeout
+
+    def remaining_wall():
+        return max(0, wall_deadline - time.monotonic())
+
     try:
         for i, rec in enumerate(records):
+            if remaining_wall() <= 0:
+                elapsed = time.monotonic() - wall_start
+                print(
+                    f"  result: TIMEOUT (wall-clock {wall_timeout}s exceeded, {elapsed:.1f}s)"
+                )
+                success = False
+                break
+
             if i > 0:
                 delay = rec["ts"] - records[i - 1]["ts"]
                 if delay > 0:
@@ -196,7 +214,7 @@ async def replay_one(trace_path: Path, clice_bin: Path, timeout: int) -> bool |
                 try:
                     await asyncio.wait_for(
                         asyncio.gather(*pending.values(), return_exceptions=True),
-                        timeout=timeout,
+                        timeout=min(timeout, remaining_wall()),
                     )
                 except asyncio.TimeoutError:
                     elapsed = time.monotonic() - wall_start
@@ -210,7 +228,19 @@ async def replay_one(trace_path: Path, clice_bin: Path, timeout: int) -> bool |
             if msg_id is not None and method is not None:
                 pending[msg_id] = asyncio.get_event_loop().create_future()
 
-            await write_lsp_message(proc.stdin, rec["msg"])
+            try:
+                await asyncio.wait_for(
+                    write_lsp_message(proc.stdin, rec["msg"]),
+                    timeout=min(30, remaining_wall()),
+                )
+            except asyncio.TimeoutError:
+                elapsed = time.monotonic() - wall_start
+                print(
+                    f"  result: HANG (write blocked at {last_method},"
+                    f" sent={sent_count}/{len(records)}, {elapsed:.1f}s)"
+                )
+                success = False
+                break
             sent_count = i + 1
 
     except (ConnectionError, BrokenPipeError):
@@ -231,7 +261,7 @@ async def replay_one(trace_path: Path, clice_bin: Path, timeout: int) -> bool |
         try:
             await asyncio.wait_for(
                 asyncio.gather(*pending.values(), return_exceptions=True),
-                timeout=timeout,
+                timeout=min(timeout, remaining_wall()),
             )
         except asyncio.TimeoutError:
             elapsed = time.monotonic() - wall_start
@@ -294,7 +324,7 @@ async def async_main(args):
             print(f"SKIP: {trace} (not found)")
             skipped += 1
             continue
-        result = await replay_one(trace, args.clice, args.timeout)
+        result = await replay_one(trace, args.clice, args.timeout, args.wall_timeout)
         if result is None:
             skipped += 1
         elif result:
@@ -317,7 +347,16 @@ def main():
     p.add_argument("traces", nargs="+", type=Path, help="JSONL trace files")
     p.add_argument("--clice", required=True, type=Path, help="Path to clice binary")
     p.add_argument(
-        "--timeout", type=int, default=120, help="Timeout in seconds (default: 120)"
+        "--timeout",
+        type=int,
+        default=120,
+        help="Per-request timeout in seconds (default: 120)",
+    )
+    p.add_argument(
+        "--wall-timeout",
+        type=int,
+        default=300,
+        help="Max wall-clock time per trace in seconds (default: 300)",
     )
     args = p.parse_args()
     sys.exit(asyncio.run(async_main(args)))

tests/snapshots/document_symbol/snapshot/statements/if/basic_if.cpp.snap.yml

@@ -0,0 +1,14 @@
+---
+source: document_symbol_tests.cpp
+created_at: 2026-05-20
+input_file: statements/if/basic_if.cpp
+---
+- { name: "basic_if", kind: Namespace, range: "1:0-35:1", selection_range: "1:10-1:18" }
+-   { name: "abs_val", kind: Function, range: "3:0-7:1", selection_range: "3:4-3:11", detail: "int (int)" }
+-   { name: "sign", kind: Function, range: "9:0-17:1", selection_range: "9:12-9:16", detail: "const char *(int)" }
+-   { name: "nested_if", kind: Function, range: "20:0-27:1", selection_range: "20:4-20:13", detail: "int (int, int)" }
+-   { name: "test", kind: Function, range: "29:0-33:1", selection_range: "29:5-29:9", detail: "void ()" }
+-     { name: "r1", kind: Variable, range: "30:21-30:41", selection_range: "30:25-30:27", detail: "int" }
+-     { name: "r2", kind: Variable, range: "31:21-31:38", selection_range: "31:26-31:28", detail: "const char *" }
+-     { name: "r3", kind: Variable, range: "32:21-32:46", selection_range: "32:25-32:27", detail: "int" }
+

tests/snapshots/folding_range/snapshot/statements/if/basic_if.cpp.snap.yml

@@ -0,0 +1,11 @@
+---
+source: folding_range_tests.cpp
+created_at: 2026-05-20
+input_file: statements/if/basic_if.cpp
+---
+- { range: "1:19-35:1", kind: namespace, collapsed_text: "{...}" }
+- { range: "3:19-7:1", kind: functionBody, collapsed_text: "{...}" }
+- { range: "9:24-17:1", kind: functionBody, collapsed_text: "{...}" }
+- { range: "20:28-27:1", kind: functionBody, collapsed_text: "{...}" }
+- { range: "29:12-33:1", kind: functionBody, collapsed_text: "{...}" }
+

tests/snapshots/inlay_hint/snapshot/statements/if/basic_if.cpp.snap.yml

@@ -0,0 +1,11 @@
+---
+source: inlay_hint_tests.cpp
+created_at: 2026-05-20
+input_file: statements/if/basic_if.cpp
+---
+- { pos: "30:38", kind: Parameter, label: "x:", padding_right: true }
+- { pos: "31:28", kind: Type, label: ": const char *" }
+- { pos: "31:36", kind: Parameter, label: "x:", padding_right: true }
+- { pos: "32:40", kind: Parameter, label: "a:", padding_right: true }
+- { pos: "32:43", kind: Parameter, label: "b:", padding_right: true }
+

tests/snapshots/semantic_tokens/snapshot/statements/if/basic_if.cpp.snap.yml

@@ -0,0 +1,75 @@
+---
+source: semantic_tokens_tests.cpp
+created_at: 2026-05-20
+input_file: statements/if/basic_if.cpp
+---
+- { loc: "0:0", text: "// basic if and if-else", kind: Comment }
+- { loc: "1:0", text: "namespace", kind: Keyword }
+- { loc: "1:10", text: "basic_if", kind: Namespace, modifiers: [Definition] }
+- { loc: "3:0", text: "int", kind: Keyword }
+- { loc: "3:4", text: "abs_val", kind: Function, modifiers: [Definition] }
+- { loc: "3:12", text: "int", kind: Keyword }
+- { loc: "3:16", text: "x", kind: Parameter, modifiers: [Definition] }
+- { loc: "4:4", text: "if", kind: Keyword }
+- { loc: "4:7", text: "x", kind: Parameter }
+- { loc: "4:11", text: "0", kind: Number }
+- { loc: "5:8", text: "return", kind: Keyword }
+- { loc: "5:16", text: "x", kind: Parameter }
+- { loc: "6:4", text: "return", kind: Keyword }
+- { loc: "6:11", text: "x", kind: Parameter }
+- { loc: "9:0", text: "const", kind: Keyword }
+- { loc: "9:6", text: "char", kind: Keyword }
+- { loc: "9:12", text: "sign", kind: Function, modifiers: [Definition, Readonly] }
+- { loc: "9:17", text: "int", kind: Keyword }
+- { loc: "9:21", text: "x", kind: Parameter, modifiers: [Definition] }
+- { loc: "10:4", text: "if", kind: Keyword }
+- { loc: "10:7", text: "x", kind: Parameter }
+- { loc: "10:11", text: "0", kind: Number }
+- { loc: "11:8", text: "return", kind: Keyword }
+- { loc: "11:15", text: "\"positive\"", kind: String }
+- { loc: "12:6", text: "else", kind: Keyword }
+- { loc: "12:11", text: "if", kind: Keyword }
+- { loc: "12:14", text: "x", kind: Parameter }
+- { loc: "12:18", text: "0", kind: Number }
+- { loc: "13:8", text: "return", kind: Keyword }
+- { loc: "13:15", text: "\"negative\"", kind: String }
+- { loc: "14:6", text: "else", kind: Keyword }
+- { loc: "15:8", text: "return", kind: Keyword }
+- { loc: "15:15", text: "\"zero\"", kind: String }
+- { loc: "19:0", text: "// dangling else: else binds to nearest if", kind: Comment }
+- { loc: "20:0", text: "int", kind: Keyword }
+- { loc: "20:4", text: "nested_if", kind: Function, modifiers: [Definition] }
+- { loc: "20:14", text: "int", kind: Keyword }
+- { loc: "20:18", text: "a", kind: Parameter, modifiers: [Definition] }
+- { loc: "20:21", text: "int", kind: Keyword }
+- { loc: "20:25", text: "b", kind: Parameter, modifiers: [Definition] }
+- { loc: "21:4", text: "if", kind: Keyword }
+- { loc: "21:7", text: "a", kind: Parameter }
+- { loc: "21:11", text: "0", kind: Number }
+- { loc: "22:8", text: "if", kind: Keyword }
+- { loc: "22:11", text: "b", kind: Parameter }
+- { loc: "22:15", text: "0", kind: Number }
+- { loc: "23:12", text: "return", kind: Keyword }
+- { loc: "23:19", text: "1", kind: Number }
+- { loc: "24:8", text: "else", kind: Keyword }
+- { loc: "25:12", text: "return", kind: Keyword }
+- { loc: "25:19", text: "2", kind: Number }
+- { loc: "26:4", text: "return", kind: Keyword }
+- { loc: "26:11", text: "0", kind: Number }
+- { loc: "29:0", text: "void", kind: Keyword }
+- { loc: "29:5", text: "test", kind: Function, modifiers: [Definition] }
+- { loc: "30:21", text: "int", kind: Keyword }
+- { loc: "30:25", text: "r1", kind: Variable, modifiers: [Definition] }
+- { loc: "30:30", text: "abs_val", kind: Function }
+- { loc: "30:39", text: "3", kind: Number }
+- { loc: "31:21", text: "auto", kind: Keyword }
+- { loc: "31:26", text: "r2", kind: Variable, modifiers: [Definition, Readonly] }
+- { loc: "31:31", text: "sign", kind: Function, modifiers: [Readonly] }
+- { loc: "31:36", text: "5", kind: Number }
+- { loc: "32:21", text: "int", kind: Keyword }
+- { loc: "32:25", text: "r3", kind: Variable, modifiers: [Definition] }
+- { loc: "32:30", text: "nested_if", kind: Function }
+- { loc: "32:40", text: "1", kind: Number }
+- { loc: "32:44", text: "1", kind: Number }
+- { loc: "35:3", text: "// namespace basic_if", kind: Comment }
+