LeanKG

Lightweight Knowledge Graph for AI-Assisted Development

LeanKG is a local-first knowledge graph that gives AI coding tools accurate codebase context. It indexes your code, builds dependency graphs, and exposes an MCP server so tools like Cursor, OpenCode, and Claude Code can query the knowledge graph directly. No cloud services, no external databases.

How LeanKG Helps

graph LR
    subgraph "Without LeanKG"
        A1[AI Tool] -->|Scans entire codebase| B1[10,000+ tokens]
        B1 --> A1
    end

    subgraph "With LeanKG"
        A2[AI Tool] -->|13-42 tokens| C[LeanKG Graph]
        C -->|Targeted subgraph| A2
    end

Without LeanKG: AI scans entire codebase (~10,000+ tokens). With LeanKG: AI queries knowledge graph for targeted context (13-42 tokens). 98% token saving for impact analysis.

Installation

One-Line Install (Recommended)

curl -fsSL https://raw.githubusercontent.com/FreePeak/LeanKG/main/scripts/install.sh | bash -s -- <target>

Supported targets:

Examples:

curl -fsSL https://raw.githubusercontent.com/FreePeak/LeanKG/main/scripts/install.sh | bash -s -- cursor
curl -fsSL https://raw.githubusercontent.com/FreePeak/LeanKG/main/scripts/install.sh | bash -s -- claude

Install via Cargo or Build from Source

cargo install leankg && leankg --version

git clone https://github.com/FreePeak/LeanKG.git && cd LeanKG && cargo build --release

Quick Start

leankg init                              # Initialize LeanKG in your project
leankg index ./src                        # Index your codebase
leankg watch ./src                        # Auto-index on file changes
leankg impact src/main.rs --depth 3       # Calculate blast radius
leankg status                             # Check index status
leankg metrics                            # View token savings
leankg web                                # Start Web UI at http://localhost:8080

See docs/cli-reference.md for all commands.

Highlights

• Auto-Init -- Install script configures MCP, rules, skills, and hooks automatically

• Auto-Trigger -- Session hooks inject LeanKG context into every AI tool session

• Token Concise -- 13-42 tokens per query vs 10,000+ for full codebase scan

• Token Saving -- Up to 98% token reduction for impact analysis

• Impact Radius -- Compute blast radius before making changes

• Dependency Graph -- Build call graphs with IMPORTS, CALLS, TESTED_BY edges

• MCP Server -- Expose graph via MCP protocol for AI tool integration

• Multi-Language -- Index Go, TypeScript, Python, Rust, Java, Kotlin with tree-sitter

See docs/architecture.md for system design and data model details.

Supported AI Tools

Note: Cursor requires per-project installation. The AI features work on a per-workspace basis, so LeanKG should be installed in each project directory where you want AI context injection.

See docs/agentic-instructions.md for detailed setup and auto-trigger behavior.

Web UI

leankg web --port 9000

Visualize your knowledge graph with force-directed layout, WebGL rendering, and community clustering.

See docs/web-ui.md for more features.

Context Metrics

Track token savings to understand LeanKG's efficiency.

leankg metrics --json              # View with JSON output
leankg metrics --since 7d           # Filter by time
leankg metrics --tool search_code   # Filter by tool

See docs/metrics.md for schema and examples.

Update

# Check current version
leankg version

# Update LeanKG binary via install script
curl -fsSL https://raw.githubusercontent.com/FreePeak/LeanKG/main/scripts/install.sh | bash -s -- update

Live Demo

Try LeanKG without installing: https://leankg.onrender.com

Documentation

Requirements

• Rust 1.70+

• macOS or Linux

License

MIT