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test-gap-analysis

100 / 100 · Low risk

Fine to try.

By microsoft/testfx (GitHub) · coding · 1,059 stars · scanned at commit 8dd78e1

Pseudo-mutation analysis ONLY: answer whether tests would catch a bug if production code changed, which meaningful changes would still pass, or which caller-visible mutations existing assertions would miss; verify candidates when requested, then optionally close verified gaps. Includes explicit read-only per-test composition for grading. Activate for behavioral blind spots tied to production behavior. Polyglot. DO NOT USE FOR: suite taxonomy, metadata, or distribution reports (test-tagging); .N…

Works with any agent that supports SKILL.md skills.

What this skill can do

We found nothing in the files we read that matches our rules. That does not prove the skill is safe: see the limits of static scanning.

Install

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

if [ -e ~/.agents/skills/'test-gap-analysis' ] || [ -L ~/.agents/skills/'test-gap-analysis' ]; then echo 'A skill folder named test-gap-analysis already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/microsoft/testfx' "$d" && git -C "$d" checkout --quiet '8dd78e1347417e400c3ef8d786059a8bb346162f' -- '.agents/skills/test-gap-analysis' && mkdir -p ~/.agents/skills && cp -R "$d"/'.agents/skills/test-gap-analysis' ~/.agents/skills/'test-gap-analysis' && 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/'test-gap-analysis' ~/.claude/skills/'test-gap-analysis' (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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