CodeGraph MCPサーバー

CodeGraph

CodeGraph turns source code and project knowledge into a searchable graph for AI agents and developers. It parses code with tree-sitter, stores structural and temporal relationships in FalkorDB, and exposes five focused tools through the Model Context Protocol (MCP).

Access the project

• Landing page
• npm package
• Source code
• Issues
• Discussions
• Contribution guide
• Security policy
• MIT license

The public npm package is @agntk/codegraph-mcp. Version 0.1.0 provides the codegraph-mcp and codegraph-dashboard bins.

What it does

• Searches code by symbol, structure, and meaning.
• Extracts functions, classes, interfaces, variables, types, imports, calls, and other relationships.
• Stores project facts with valid_at and invalid_at timestamps for point-in-time queries.
• Supports first-class TypeScript, JavaScript, Python, Go, Rust, and Markdown parsing, with generic tree-sitter support for additional languages.
• Runs with embedded FalkorDBLite on Linux x64 and Apple silicon macOS, or an external FalkorDB service on any supported Node.js platform. Apple silicon requires Homebrew libomp and openssl@3 runtime libraries.
• Explores exact graph totals in Files or Symbols view with most-connected-first windows, Previous/Next paging, append-style loading, in-place neighbor expansion, and a Files-view toggle for unresolved external modules.
• Exposes analyze, codebase, knowledge, query, and search MCP tools.

Choose how to start

CodeGraph requires Node.js 20 or newer. The npm commands below install the public @agntk/codegraph-mcp package from the registry.

Agent-first with MCP

Add this server configuration to an MCP client:

{
  "mcpServers": {
    "codegraph": {
      "command": "npx",
      "args": ["-y", "@agntk/codegraph-mcp"]
    }
  }
}

In the first conversation, ask the agent to check CodeGraph status:

{"method":"tools/call","params":{"name":"codebase","arguments":{"action":"status"}}}

On a fresh install, codebase status returns configured: false and setupRequired: true. An empty database is a valid first run. Configure one absolute project path, then start a full index:

{"method":"tools/call","params":{"name":"codebase","arguments":{"action":"configure","projectAction":"set","projects":["/absolute/path/to/project"]}}}

{"method":"tools/call","params":{"name":"codebase","arguments":{"action":"reindex","mode":"full","scope":"/absolute/path/to/project"}}}

Configuration saves the project but does not index it. The full reindex parses structure first and then finishes embeddings. With the local provider, codebase status includes model load and indexing state while work is running.

Dashboard-first in a browser

Start the dashboard directly from the package:

npx -y -p @agntk/codegraph-mcp codegraph-dashboard

Open the URL printed by the process. A fresh database opens on the setup flow. Confirm storage and embeddings, choose Browse to select a folder, then select Index project. The page shows model download and indexing progress, finishes remaining embeddings automatically, and reports file, symbol, edge, and embedding counts before opening the graph explorer.

The dashboard and MCP server are separate entry points. They can run at the same time against the same data path.

Platform and storage

Platform	Default driver	Prerequisites	Configuration
Linux x64	Embedded FalkorDBLite	Node.js 20 or newer	No database configuration when the embedded package is available
macOS Apple silicon	Embedded FalkorDBLite	Node.js 20 or newer, brew install libomp openssl@3	No database configuration when the libraries and embedded package are available
macOS Intel	External FalkorDB	Node.js 20 or newer	Set the external variables below
Windows x64	External FalkorDB	Node.js 20 or newer	Set the external variables below
Linux arm64 and other platforms	External FalkorDB	Node.js 20 or newer	Set the external variables below

An explicit CODEGRAPH_DRIVER always wins. Without it, a configured FALKORDB_URL or FALKORDB_HOST selects external FalkorDB. Otherwise CodeGraph selects embedded FalkorDBLite on Linux x64, or on Apple silicon macOS when its native libraries are present, and falls back to external FalkorDB if the embedded package cannot load. All other platforms default to external FalkorDB.

CODEGRAPH_DATA_DIR defaults to ~/.codegraph; the MCP project configuration is stored at ~/.codegraph/mcp-context.json. Embedded database storage separately defaults to <current working directory>/.codegraph/falkordb. If that database path is too long for a Unix socket, CodeGraph relocates it to ~/.codegraph/graphs/<12-hex-digest>. Set CODEGRAPH_DATA_DIR to a writable directory for MCP configuration, and set CODEGRAPH_DB_PATH to a writable directory for embedded database files.

For external FalkorDB, set either a URL:

CODEGRAPH_DRIVER=falkordb
FALKORDB_URL=host:6379

Or set a host and port:

CODEGRAPH_DRIVER=falkordb
FALKORDB_HOST=host
FALKORDB_PORT=6379

One database server runs per data directory; a second CodeGraph process attaches to it.

Embeddings and privacy

Provider	Model and dimensions	Configuration	First run
Local	nomic-ai/nomic-embed-text-v1.5, 768	No key and no provider override	Default no-key path. Downloads approximately 132 MiB, measured as 138,011,417 bytes (131.6 MiB), shows progress, then caches the model locally.
Voyage	voyage-code-3, 1024	CODEGRAPH_EMBEDDING_PROVIDER=voyage and VOYAGE_API_KEY	Sends embedding inputs to Voyage.
OpenRouter	openai/text-embedding-3-small, 1536	CODEGRAPH_EMBEDDING_PROVIDER=openrouter and OPENROUTER_API_KEY	Sends embedding inputs to OpenRouter.
None	No model, 0	CODEGRAPH_EMBEDDING_PROVIDER=none	Explicit structural-only mode. Semantic similarity search is unavailable.

If no provider is set, a configured Voyage key selects Voyage, a configured OpenRouter key selects OpenRouter, and no key selects local. Set CODEGRAPH_EMBEDDING_PROVIDER explicitly when you need to pin the choice.

Provider, model, and dimension are stored with the graph. If any of them changes, CodeGraph blocks graph mutation with this remedy: Run an explicit re-embed migration or a full reindex before using the requested embedding profile.

MCP tools

Tool	Purpose
analyze	Inspect impact, call hierarchy, cycles, dead-code candidates, hotspots, change coupling, and ownership inferred from indexed git history
search	Find code and project knowledge by name, structure, or meaning
knowledge	Store and recall entities, relationships, facts, and documents
codebase	Configure projects, index code, inspect status, and read source
query	Run read-only Cypher queries against the graph

Set CODEGRAPH_RAW_TOOLS=true to expose lower-level handlers alongside the five grouped tools.

Configuration

Variable	Purpose
CODEGRAPH_DRIVER	falkordblite for embedded storage or falkordb for an external service; defaults by platform as described above
CODEGRAPH_DATA_DIR	MCP configuration directory, default ~/.codegraph; must be writable by the CodeGraph process
CODEGRAPH_DB_PATH	Embedded FalkorDBLite data path, default <current working directory>/.codegraph/falkordb; must be writable by the CodeGraph process
FALKORDB_URL	External FalkorDB host and port
FALKORDB_HOST	External FalkorDB host, default localhost
FALKORDB_PORT	External FalkorDB port, default 6379
FALKORDB_GRAPH	Graph name, default codegraph
CODEGRAPH_EMBEDDING_PROVIDER	local, voyage, openrouter, or none; when unset, resolves Voyage key, then OpenRouter key, then local
VOYAGE_API_KEY	Voyage embeddings and optional reranking
OPENROUTER_API_KEY	OpenRouter embeddings or LLM features
CEREBRAS_API_KEY	Optional LLM-backed knowledge extraction
API_PORT	Dashboard and REST API port, default 3001; use the printed URL
CODEGRAPH_BROWSE_ROOTS	Additional absolute dashboard Browse roots, separated by commas
CODEGRAPH_RAW_TOOLS	Set to the literal value true to expose raw handlers alongside the five grouped MCP tools

Never commit provider keys. Put secrets in the MCP client's protected environment configuration or a local ignored .env file.

Release verification

The canonical package command is:

pnpm pack:npm

It builds and validates one publishable tarball under tmp/release. The complete release gate is:

pnpm release:check

The basic installed-tarball smoke proves the package installs in a clean consumer, both binaries start, all five MCP tools are present, a fresh database is setup-safe, Browse and indexing work, data survives restarts, the dashboard and MCP process share one embedded server, and the exact tarball hash is reported. The release CI runs that installed artifact with embedded storage on Linux x64 and Apple silicon, and checks external FalkorDB guidance on Windows x64. An opt-in local-provider lane proves cold model download progress and a usable 768-dimension vector index.

A clean-consumer local tarball proof verifies that bare npx -y @agntk/codegraph-mcp selects the codegraph-mcp bin and that npx -y -p @agntk/codegraph-mcp codegraph-dashboard selects the dashboard bin. Both forms also resolve and boot from the public npm registry.

Development

pnpm install --frozen-lockfile
pnpm audit:prod
pnpm lint
pnpm typecheck
pnpm test
pnpm build
pnpm docker:db
pnpm test:integration
pnpm test:scripts
pnpm build:mcpb
pnpm release:check

See CONTRIBUTING.md for the pull request workflow and required evidence. FalkorDBLite's Linux x64 and Apple silicon macOS binaries are installed with the workspace dependencies. Apple silicon also requires Homebrew libomp and openssl@3.

Packages

Package	Responsibility
@codegraph/core	Indexing, search pipelines, services, and git synchronization
@codegraph/graph	FalkorDB and FalkorDBLite drivers, graph queries, and knowledge operations
@codegraph/plugin-nlp	Embeddings, reranking, entity resolution, and document ingestion
@codegraph/mcp-server	MCP transport and the five public tool groups
@codegraph/cli	Source-checkout command-line tools
@agntk/codegraph-mcp	Public npm distribution staging and entry point
@codegraph/mcpb	Platform-local MCPB desktop extension build
@codegraph/api	REST API consumed by the dashboard
@codegraph/dashboard	Static dashboard UI served by the API

The marketing site lives in apps/web, and the reproducible search benchmark lives in benchmarks/cgbench-v1.

License

CodeGraph is available under the MIT License.