Outsider-perspective end-to-end review of a plan, PR, or code change. First questions intent and whether a simpler/more elegant approach would achieve the same goal, then traces the actual code path (not just the diff) to verify the change does what it claims. Output is concise, actionable, and every call carries its rationale.
Install
npx skills add thananon/9arm-skills --skill scrutinizenpx skills add thananon/9arm-skills --skill scrutinize -a claude-code -gnpx skills add thananon/9arm-skills --skill scrutinize -a codex -ggemini skills install https://github.com/thananon/9arm-skills.git --path skills/engineering/scrutinizegh skill install thananon/9arm-skills scrutinizegit clone --depth 1 https://github.com/thananon/9arm-skills /tmp/thananon__9arm-skills
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/thananon__9arm-skills/skills/engineering/scrutinize ~/.claude/skills/scrutinize # Claude Code
cp -R /tmp/thananon__9arm-skills/skills/engineering/scrutinize ~/.agents/skills/scrutinize # Codex, Cursor, Gemini CLI, Copilot, OpenCode