gdb-mcp

jtang613/gdb-mcp

3.4

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A lightweight MCP server that runs inside GDB, allowing direct command execution and output retrieval.

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GDB MCP Server (FastMCP)

A lightweight MCP server that runs inside GDB. It exposes a single tool, gdb-command, which proxies input directly to GDB’s command interpreter and returns the textual output. The server runs over SSE and is started from within GDB via the mcp-server command.

Features

  • gdb-command: pass any GDB command, get back its output.
  • Minimal, self-contained script: gdb-mcp (loaded via source).

Requirements

  • GDB with Python support enabled.
  • Python 3.x and the fastmcp library available to GDB’s embedded Python.

Check Python support: gdb -q -ex "python print('ok')" -ex quit

Install FastMCP: python3 -m pip install fastmcp If import fails in GDB, ensure fastmcp is installed to the same Python environment GDB uses.

Quick Start

  1. Start GDB with the MCP extension loaded
  • gdb -q -ex 'source ./gdb-mcp'
  • Alternatively, load from within gdb source ./gdb-mcp
  1. Launch the SSE server from within GDB
  • mcp-server 127.0.0.1 3333
  1. Connect an MCP client to the server
  • Configure your MCP client to connect to the SSE server at the host/port selected above and call tool gdb-command.

Tool: gdb-command

  • Parameters:
    • command (string): the exact GDB command to run (e.g., info registers).
  • Returns: string (captured GDB output or an error message).

Notes & Tips

  • No timeout or stop control is provided by this script. To interrupt long-running target execution, issue the interrupt command.
  • Do not bind publicly unless you trust clients; this endpoint can execute arbitrary GDB commands.
  • To auto-load, add a line to your ~/.gdbinit: source /absolute/path/to/gdb-mcp.
  • There is no builtin 'stop server' functionality. To teardown the server, exit GDB.

License

MIT — see LICENSE.

Acknowledgements

  • Built on top of the excellent fastmcp library.