Evaluate test suite quality by introducing code mutations and verifying tests catch them. Use for mutation testing, test quality, mutant detection, Stryker, PITest, and test effectiveness analysis.
Install
npx skills add aj-geddes/useful-ai-prompts --skill mutation-testingnpx skills add aj-geddes/useful-ai-prompts --skill mutation-testing -a claude-code -gnpx skills add aj-geddes/useful-ai-prompts --skill mutation-testing -a codex -ggemini skills install https://github.com/aj-geddes/useful-ai-prompts.git --path skills/mutation-testinggh skill install aj-geddes/useful-ai-prompts mutation-testinggit clone --depth 1 https://github.com/aj-geddes/useful-ai-prompts /tmp/aj-geddes__useful-ai-prompts
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/aj-geddes__useful-ai-prompts/skills/mutation-testing ~/.claude/skills/mutation-testing # Claude Code
cp -R /tmp/aj-geddes__useful-ai-prompts/skills/mutation-testing ~/.agents/skills/mutation-testing # Codex, Cursor, Gemini CLI, Copilot, OpenCode