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

Related MCP server: MCP Server Python Template

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:

Or use with uv:

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.