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mutation-testing

82 / 100 · Low risk

Fine to try. Some of what it can do is expected: a coding skill usually runs build and test commands.

By citypaul/.dotfiles (GitHub) · coding · 760 stars · scanned at commit cd4028d

Set up and run mutation testing with Stryker, including full-project and focused diff runs against the current review base, then use surviving mutants to strengthen weak or missing tests. Use as the end-of-phase PR-readiness gate after implementation and refactoring are complete, not inside each RED-GREEN increment. Also use when the user explicitly asks for mutation testing, Stryker, mutation score, or surviving-mutant analysis. For writing the tests themselves, see testing.

Works with any agent that supports SKILL.md skills.

What this skill can do

Install

Paste this into your terminal. It downloads exactly the version we scanned, not whatever is newest.

if [ -e ~/.agents/skills/'mutation-testing' ] || [ -L ~/.agents/skills/'mutation-testing' ]; then echo 'A skill folder named mutation-testing already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/citypaul/.dotfiles' "$d" && git -C "$d" checkout --quiet 'cd4028d57d6e4e95814f7b8ee55ca13c23a9c2f0' -- 'claude/.claude/skills/mutation-testing' && mkdir -p ~/.agents/skills && cp -R "$d"/'claude/.claude/skills/mutation-testing' ~/.agents/skills/'mutation-testing' && rm -rf "$d"; fi

Codex reads ~/.agents/skills directly. For Claude Code, Cursor, Copilot, Gemini CLI, Antigravity or OpenCode, also link it. For Claude Code: ln -s ~/.agents/skills/'mutation-testing' ~/.claude/skills/'mutation-testing' (other agents: ~/.cursor/skills, ~/.copilot/skills, ~/.gemini/skills, ~/.gemini/config/skills, ~/.config/opencode/skills). Or install through the finder skill, which does both.

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Score history

Also found in

Identical copies of this skill exist at:

• connorads/dotfiles/.config/skills/vendor/.agents/skills/mutation-testing