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clangd-mcp

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clangd-mcp

Experimental — expect rough edges and breaking changes.

A minimal Model Context Protocol server that bridges AI assistants to clangd for C/C++ code intelligence.

How it works

Claude / Gemini  ←─ MCP (stdio) ─→  server.py  ←─ LSP (stdio) ─→  clangd

server.py speaks MCP to the AI client and LSP (JSON-RPC 2.0 over stdin/stdout) to clangd. The two protocols are bridged by nine tools:

Tool

LSP call(s)

Description

find_symbol

workspace/symbol

Search symbols by name (fuzzy)

get_definition

workspace/symbol → textDocument/definition

Show the definition site with source

find_references

workspace/symbol → textDocument/references

List every usage, grouped by file

get_type_info

workspace/symbol → textDocument/hover

Show type signature and doc comment

find_implementations

workspace/symbol → textDocument/implementation

Find concrete implementations of a virtual method or interface

get_callers

workspace/symbol → prepareCallHierarchy → incomingCalls

Find every call site that calls a function

get_callees

workspace/symbol → prepareCallHierarchy → outgoingCalls

Find every function called by a function

list_file_symbols

textDocument/documentSymbol

List all symbols defined in a file

get_type_hierarchy

workspace/symbol → prepareTypeHierarchy → supertypes + subtypes

Show base classes and derived classes

Related MCP server: fw-context-mcp

Requirements

  • Python ≥ 3.12

  • uv

  • clangd on $PATH (or specify --clangd)

  • A compile_commands.json for your project (CMake: cmake -DCMAKE_EXPORT_COMPILE_COMMANDS=ON)

Installation

uv tool install git+https://github.com/schuay/clangd-mcp.git

This installs a clangd-mcp command into an isolated environment and puts a shim on your $PATH. Upgrade later with:

uv tool upgrade clangd-mcp

Gemini CLI

curl -fsSL https://raw.githubusercontent.com/schuay/clangd-mcp/main/install-gemini.sh | bash

This installs the tool, prompts for project paths, and adds the server to ~/.gemini/settings.json. Requires jq.

Or add manually to ~/.gemini/settings.json:

{
  "mcpServers": {
    "clangd": {
      "command": "clangd-mcp",
      "args": [
        "--compile-commands-dir", "/path/to/your/build",
        "--workspace-dir", "/path/to/your/project",
        "--seed-file", "/path/to/your/project/src/main.cpp"
      ]
    }
  }
}

Options

All flags are optional:

Flag

Default

Description

--clangd

clangd

Path to the clangd binary

--compile-commands-dir

(none)

Directory containing compile_commands.json

--workspace-dir

current directory

Root of the C/C++ project

--seed-file

(none)

Source file to open at startup to trigger background indexing

--log-level

WARNING

DEBUG / INFO / WARNING / ERROR (to stderr)

Tests

uv run python tests.py
# or with pytest for coloured output:
uv run pytest tests.py -v

The test suite runs without a real clangd binary — it drives the LSP client with canned in-process responses and patches the global lsp object when testing the MCP tool handlers.

File structure

server.py        MCP server: tools, arg parsing, clangd lifecycle
lsp_client.py  LSP client: subprocess management, JSON-RPC framing, queries
tests.py       Unit tests (no clangd required)
pyproject.toml Dependencies (mcp>=1.0)

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