The ultimate RAG for your monorepo. Query, understand, and edit multi-language codebases with the power of AI and knowledge graphs
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Tools
Tools
No tool list yet. Remote servers get one after the first health check.
Copy the stdio config for Cursor, Claude Desktop, Claude Code, or VS Code on this page. It uses the publisher's install, not a PlugMCP proxy.
Does Code Graph Rag need an API key?
No required environment variable is listed on this record.
What transport does Code Graph Rag use?
Code Graph Rag runs locally over stdio.
When was Code Graph Rag last checked?
Last checked 2026-11-10. The ultimate RAG for your monorepo. Query, understand, and edit multi-language codebases with the power of AI and knowledge graphs
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From the publisher
Documentation
Code-Graph-RAG
Code-Graph-RAG parses a multi-language codebase with Tree-sitter, sharpened by compiler-grade frontends and runtime traces where available, builds a knowledge graph of its structure in an embedded graph database that needs no server, and lets you query, edit, and optimise that code in plain English. It works across a monorepo of mixed languages under one unified graph schema.
Latest News 🔥
GitHub Sponsors: Added support for GitHub Sponsors via the command line.
Point Code-Graph-RAG at a repository and it reads every source file, extracts functions, classes, methods, modules, and the relationships between them, and stores the result as an interconnected graph. Once the graph exists you can:
Ask questions about the codebase in natural language and get answers grounded in the real structure.
Retrieve the actual source of any function, class, or method by name or by intent.
Edit code through the agent with AST-based surgical patching and a diff preview before anything changes.
Key features
01. The ultimate RAG for your monorepo
02. Query, understand, and edit multi-language codebases with the power of AI and knowledge graphs
Optimise code against language best practices or your own coding standards.
Find dead code by walking call and reference edges from entry points.
Search and rewrite structurally by AST pattern with ast-grep.
Overlay runtime behaviour: trace a test run (or pull production eBPF profiles) with cgr trace and merge the calls that actually happened into the graph, exposing dispatch that static analysis cannot see.
How It Works
The system has two components:
Multi-language parser. A Tree-sitter based parser reads the codebase and ingests functions, classes, methods, modules, and their relationships into the graph under a single language-agnostic schema. Where a toolchain is available, compiler-grade frontends layer exact facts on top (libclang for C/C++, go/types for Go, and opt-in Roslyn, javac and Jedi for C#, Java and Python), and dynamic tracing merges calls observed at runtime. Tree-sitter stays the backbone: a trace only sees code that ran, and a compiler frontend only covers what its toolchain can build.
RAG system (codebase_rag/). An interactive CLI that turns natural language into Cypher queries, retrieves matching code, and drives AI-powered editing and optimisation.
Source Code -> Tree-sitter Parser -> AST Analysis -> Knowledge Graph
|
User Query -> AI Model (Cypher Gen) -> Cypher Query -> Graph Results -> Response
The graph is stored in an embedded SQLite file by default. Memgraph and Neo4j are opt-in backends that run the same Cypher; Graph Backends compares them.
Python, TypeScript, TSX, JavaScript, Rust, Go, Java, C, C++, C#, PHP, Lua, Dart, and Julia are fully supported. Scala is in development, and Ruby, Kotlin, Swift, Elixir, Haskell, Solidity, Bash, and Nix have structural support (modules, functions, classes where the language has them, and imports) through the pluggable ast-grep tier. See the Language Support matrix for per-language capabilities.
Installation
cgr is published to PyPI. Install it system-wide with the treesitter-full (tree-sitter grammars), ast-grep (Ruby, Kotlin, Swift, Elixir, Haskell, Solidity, Bash, Nix) and semantic (vector search) extras:
# with uv (recommended)
uv tool install "code-graph-rag[treesitter-full,ast-grep,semantic]"
# or with pipx
pipx install "code-graph-rag[treesitter-full,ast-grep,semantic]"
Which version am I getting?
Three version lines exist and they intentionally differ:
where
what it tracks
git tags
every version, one per merge
GitHub Releases (binaries, signatures)
every 50th version, plus any security fix
PyPI
every 50th version, plus any security fix
So the newest tag on main usually runs ahead of the newest release, often by
tens of patch versions; they coincide only just after a release. Nothing is
stuck, the cadences differ by design. A security fix does NOT wait for the
cadence: it ships a release and a PyPI upload immediately.
uv tool install and pipx install give you the newest PyPI version, which is the
newest RELEASE, not the newest tag. Interim tags exist so every merge is
addressable; binaries and PyPI uploads follow the cadence above.
To run code newer than the latest release, install from git:
To upgrade an existing install, run uv tool upgrade code-graph-rag (with pipx, pipx upgrade code-graph-rag, or pipx reinstall code-graph-rag for a git install). Upgrade covers the other install methods.
You also need Python 3.12+ and ripgrep. The graph lives in an embedded SQLite file by default, so there is no database server to run: no Docker and no cmake. Memgraph and Neo4j remain available as opt-in backends (Graph Backends). Full prerequisites, source installs, and environment setup are in the Installation guide.
[!NOTE]
The wheel is pure Python (py3-none-any), so it installs on any platform with Python 3.12 or newer. Older system interpreters (Debian Bookworm ships 3.11) need the interpreter pinned explicitly; see Installation for the commands.
Quick Start
# Parse a repository into the graph, then query it
cgr start --repo-path /path/to/repo --update-graph
cgr start --repo-path /path/to/repo
The graph is written to ~/.cgr/graph.sqlite (set SQLITE_GRAPH_PATH to move it).
To use Memgraph instead, install the driver with the memgraph extra, set
GRAPH_BACKEND=memgraph, and start the packaged Memgraph + Qdrant stack with
cgr daemon up.
Repeat the first command for each repository you want indexed; the graph is
shared, and syncing one project leaves the others alone. To start over from an
empty graph, add --clean — it deletes every project in the shared graph,
not just this one, and asks for confirmation first when other
projects would be destroyed.
A default index leaves out the opt-in capture groups; add them with --capture or CGR_CAPTURE.
The Quick Start guide walks through parsing, querying, and exporting in five minutes.
MCP Server
Code-Graph-RAG runs as an MCP server so Claude Code and other MCP clients can query and edit your codebase directly. See the MCP Server guide for setup.
Code-Graph-RAG is open source and free to use. For organisations that need more, we offer fully managed cloud-hosted solutions and on-premise deployments:
Cloud-Hosted Deployment: Managed cloud infrastructure for both the graph database and the AI agent connection. Zero infrastructure overhead, so we handle scaling, updates, and availability while your team focuses on building.
On-Premise & Air-Gapped Deployment: Deploy Code-Graph-RAG entirely within your own environment, including air-gapped networks. Full data sovereignty for regulated industries and security-sensitive organisations.
We also offer custom development, integration consulting, technical support contracts, and team training.
Please see CONTRIBUTING.md for contribution guidelines. Good first PRs come from the TODO issues.
Support
For issues or questions, check the Troubleshooting guide first, then open an issue.
If cgr is useful to you, please consider pledging support on GitHub Sponsors. cgr links the page under cgr --version and, in a terminal, after most commands finish; set CGR_SPONSOR_PLEDGE=false to hide that line.
