Joern MCP
About
A Model Context Protocol (MCP) server that provides AI assistants with static code analysis capabilities using Joern's Code Property Graph (CPG) technology.
Details
- Author
- Lekssays
- Downloads
- 371
- Categories
- Other
Jump to
- Multi‑language static analysis via Joern’s CPG
- Docker isolation per analysis session
- GitHub repository analysis directly from URLs
- Persistent CPG sessions with automatic cleanup
- Redis‑backed caching and session management
- Async CPG generation and query execution
Setting up with Highlight
This MCP is not yet compatible with Highlight’s one-click setup. However, you can still use it with Highlight by following these steps:
- Download and install Highlight from highlightai.com/download
- Navigate to the plugins tab and select "Add Custom Plugin"
-
Configure the plugin with the settings below
Plugin Name
Joern MCPCommand (node, npx, python, etc.)Please refer to the README for specific instructions on how to obtain API keys or other required environment variables.
- Enable "Start Automatically" if you want the plugin to start when Highlight launches
From the repository
To use Joern MCP, clone the repository, install Python dependencies, run ./setup.sh to build the Joern Docker image and start Redis, then launch the server with python main.py. The server uses Streamable HTTP transport and is available at http://localhost:4242. Integration with GitHub Copilot is done by adding the server URL to VS Code’s settings.json.
Claude Desktop / Cursor
Paste into your MCP client config file to install this server.
{
"mcpServers": {
"joern mcp": {
"joern-mcp": {
"url": "https://0.0.0.0:4242/mcp"
}
}
}
}McpServers
{
"joern-mcp": {
"url": "https://0.0.0.0:4242/mcp"
}
}🕷️ joern-mcp
A Model Context Protocol (MCP) server that provides AI assistants with static code analysis capabilities using Joern's Code Property Graph (CPG) technology.
Features
- Multi-Language Support: Java, C/C++, JavaScript, Python, Go, Kotlin, C#, Ghidra, Jimple, PHP, Ruby, Swift
- Docker Isolation: Each analysis session runs in a secure container
- GitHub Integration: Analyze repositories directly from GitHub URLs
- Session-Based: Persistent CPG sessions with automatic cleanup
- Redis-Backed: Fast caching and session management
- Async Queries: Non-blocking CPG generation and query execution
Quick Start
Prerequisites
- Python 3.8+
- Docker
- Redis
- Git
Installation
1. Clone and install dependencies:
git clone https://github.com/Lekssays/joern-mcp.git
cd joern-mcp
pip install -r requirements.txt
2. Setup (builds Joern image and starts Redis):
./setup.sh
3. Configure (optional):
```bash
cp config.example.yaml config.yaml
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