Leankg

Name: Leankg
Author: FreePeak

@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.

Basic information

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.