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mutation-testing

80 / 100 · Low risk

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

By laurigates/claude-plugins (GitHub) · coding · 59 stars · scanned at commit 16af2dc

Mutation testing with Stryker (TS/JS) and mutmut (Python). Use when finding weak tests that pass on mutated code, or improving test quality through mutation analysis.

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=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/laurigates/claude-plugins' "$d" && git -C "$d" checkout --quiet '16af2dca8c1e706bab01e003bf03a7d19192b346' -- 'testing-plugin/skills/mutation-testing' && mkdir -p ~/.agents/skills && cp -R "$d"/'testing-plugin/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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