Joern MCP Server

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About Joern MCP Server

A simple Joern MCP Server.

Config

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

{
  "mcpServers": {
    "mcp-joern": {
      "command": "uv",
      "args": [
        "venv",
        ".venv"
      ]
    }
  }
}

Tools

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Overview

What is Joern MCP Server?

An MCP server based on Joern that provides features for code review and security analysis. It is designed for developers using large language models to analyze source code.

How to use Joern MCP Server?

Install dependencies with Python 3.10+ and uv, start the Joern server with the provided command, copy env_example.txt to .env, modify JVM and auth settings, then configure the server in your MCP client (e.g., Cline) using the sample sample_cline_mcp_settings.json. Finally, ask questions to the language model as described in prompts_en.md.

Key features of Joern MCP Server

Code review and security analysis via Joern
MCP‑based integration with LLMs
Scala tools for server interaction
Test clients to verify connectivity
Environment variable configuration support

Use cases of Joern MCP Server

Automated security auditing of codebases
Assisting LLMs in static analysis queries
Integrating Joern’s code property graphs into MCP‑aware tools

FAQ from Joern MCP Server

What is Joern MCP Server?

A simple MCP Server for Joern that helps developers with code review and security analysis.

What are the environment requirements?

Python >= 3.10 (default 3.12), the uv package manager, and a running Joern instance.

How do I install it?

Clone the repository, create a virtual environment with uv venv .venv, activate it, and run uv sync.

How do I configure authentication?

The Joern server must be started with --server-auth-username and --server-auth-password flags; these values are then set in the .env file.

How can I contribute?

Submit Issues and Pull Requests to improve the project or add new tools.

Frequently asked questions

What is Joern MCP Server?

A simple MCP Server for Joern that helps developers with code review and security analysis.

What are the environment requirements?

Python >= 3.10 (default 3.12), the `uv` package manager, and a running Joern instance.

How do I install it?

Clone the repository, create a virtual environment with `uv venv .venv`, activate it, and run `uv sync`.

How do I configure authentication?

The Joern server must be started with `--server-auth-username` and `--server-auth-password` flags; these values are then set in the `.env` file.

How can I contribute?

Submit Issues and Pull Requests to improve the project or add new tools.

Comments

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