Mutmut MCP

A Model Context Protocol (MCP) server for managing mutation testing with mutmut. This tool provides a set of programmatic APIs for running mutation tests, analyzing results, and improving test coverage in Python projects.

Features

• Run mutation testing sessions on any Python module or package
• Show overall mutation testing results and surviving mutations
• Suggest areas needing better test coverage
• Rerun mutmut on specific survivors or all survivors
• Clean mutmut cache
• Designed for automation and integration with other MCP tools

Installation

Installing via Smithery

To install mutmut-mcp for Claude Desktop automatically via Smithery:

npx -y @smithery/cli install @wdm0006/mutmut-mcp --client claude

Manual Installation

1. Clone the repository:

   git clone https://github.com/wdm0006/mutmut-mcp.git
   cd mutmut-mcp
   

2. Install dependencies:

   python3 -m venv .venv
   source .venv/bin/activate
   pip install -U pip
   pip install mcp[cli] mutmut
   

Usage

You can run the MCP server directly:

python mutmut_mcp.py

Or use with uv:

uv run --with mcp --with mutmut mutmut_mcp.py

API / Tools

The following tools are available:

• run_mutmut(target, test_command="pytest", options="", venv_path=None) – Run mutation testing
• show_results(venv_path=None) – Show overall results
• show_survivors(venv_path=None) – List surviving mutations
• generate_test_suggestion(venv_path=None) – Suggest areas needing better test coverage
• rerun_mutmut_on_survivor(mutation_id=None, venv_path=None) – Rerun mutmut on survivors
• clean_mutmut_cache(venv_path=None) – Clean mutmut cache

License

This project is licensed under the MIT License. See LICENSE for details.