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Joern MCP Server

@Lekssays

Repository

Basic information

Category

Other

Last updated

Transports

stdio

Author

Lekssays

Submitted by

Ahmed Lekssays

About Joern MCP Server

A Model Context Protocol (MCP) server that provides AI assistants with static code analysis capabilities using Joern's Code Property Graph (CPG) technology.

#code-analysis#program-analysis#vulnerability-detection#vulnerability-patching

Joern MCP Server config

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

{
  "mcpServers": {
    "joern-mcp": {
      "url": "https://0.0.0.0:4242/mcp"
    }
  }
}

Joern MCP Server tools

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Overview

What is Joern MCP?

Joern MCP is a Model Context Protocol (MCP) server that provides AI assistants with static code analysis capabilities using Joern’s Code Property Graph (CPG) technology. It supports multi‑language analysis (Java, C/C++, JavaScript, Python, Go, Kotlin, C#, Ghidra, Jimple, PHP, Ruby, Swift), runs each analysis session in a Docker container, and can analyze repositories directly from GitHub URLs.

How to use Joern MCP?

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.

Key features of Joern MCP

  • 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

Use cases of Joern MCP

  • Run custom CPGQL queries on any supported codebase
  • Explore code structure (methods, calls, files, code snippets)
  • Find security vulnerabilities with taint analysis and program slicing
  • Check method reachability and build call graphs
  • Search for hard‑coded secrets or dangerous API usage

Frequently asked questions

1

What languages does Joern MCP support?

Java, C/C++, JavaScript, Python, Go, Kotlin, C#, Ghidra, Jimple, PHP, Ruby, and Swift.

2

What are the runtime requirements?

Python 3.8+, Docker, Redis, and Git are required.

3

How does the server handle data persistence?

Sessions, query results, and CPG data are cached in Redis and automatically cleaned up based on a configurable TTL and concurrency limit.

4

Which transport protocol does the server use?

The server uses Streamable HTTP transport, making it network‑accessible and able to handle multiple concurrent clients.

5

Can I configure memory limits for large projects?

Yes, memory limits for Joern can be set via environment variables (`JOERN_MEMORY_LIMIT`, `JOERN_JAVA_OPTS`) or in the `config.yaml` file.

Comments

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