Leankg

@FreePeak

About Leankg

A local, Rust-based Knowledge Graph MCP server. Cuts AI coding token usage by up to 98% by intelligently querying your codebase instead of sending full files.

Config

Add this server to your MCP-compatible client using the configuration below.

{
  "mcpServers": {
    "leankg": {
      "command": "leankg",
      "args": [
        "start",
        "--mcp"
      ]
    }
  }
}

Tools

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Overview

What is LeanKG?

LeanKG is a local Knowledge Graph powered by Rust and Tree-sitter that indexes your codebase and uses the Model Context Protocol (MCP) to feed your AI assistant only the exact structural context it needs. It is built for developers who want to drastically reduce token usage (up to 98% drop) and avoid sending entire files or repositories to cloud-based AI tools.

How to use LeanKG?

Visit the LeanKG GitHub repository for full installation instructions, benchmarks, and supported languages. After installation, the MCP server exposes tools that your AI assistant can invoke — no additional configuration steps beyond connecting it to an MCP-compatible host (e.g., Claude Desktop, Cursor, Windsurf, OpenCode).

Key features of LeanKG

Reduces token usage by up to 98% (from ~10,000+ to ~40 tokens per query).
100% local execution — runs securely on your machine with Rust and CozoDB.
Deep code understanding via Graph RAG, including call graphs and circular dependencies.
Universal MCP support for any MCP-compatible AI host.
Provides tools like analyze_dependencies and extract_signatures.

Use cases of LeanKG

Slash API costs when interacting with large codebases in Claude or Cursor.
Quickly understand call graphs and dependencies without reading entire files.
Extract precise function signatures and types for documentation or refactoring.
Avoid leaking proprietary code by keeping indexing entirely local.

FAQ from LeanKG

How does LeanKG reduce token usage?

It uses Graph RAG to extract precise function signatures, dependencies, and variables instead of sending entire files or repositories.

Is my code ever uploaded to an external server?

No. LeanKG runs entirely on your local machine; your repository is never blindly uploaded.

Which AI tools are compatible with LeanKG?

LeanKG supports any MCP-compatible host, including Claude Desktop, Cursor, Windsurf, and OpenCode.

Frequently asked questions

How does LeanKG reduce token usage?

It uses Graph RAG to extract precise function signatures, dependencies, and variables instead of sending entire files or repositories.

Is my code ever uploaded to an external server?

No. LeanKG runs entirely on your local machine; your repository is never blindly uploaded.

Which AI tools are compatible with LeanKG?

LeanKG supports any MCP-compatible host, including Claude Desktop, Cursor, Windsurf, and OpenCode.

Comments

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