Validate test effectiveness with mutation testing using Stryker (TypeScript/JavaScript with Vitest or bun test via @hughescr/stryker-bun-runner) and mutmut (Python). Find weak tests that pass despite code mutations. Use to improve test quality.
Installation
1
Add the marketplace
/plugin marketplace add secondsky/claude-skills
2
Install plugins
/plugin
Run these commands in Claude Code to add this plugin to your environment. The marketplace must be added before you can install its plugins.