Skills for Real Engineers. Straight from my .agents directory.
scrutinize
Agent skill fromthananon/9arm-skills
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. Trigger on /scrutinize and proactively whenever the user asks to review, audit, sanity-check, or get a second opinion on a plan, PR, diff, design doc, or proposed code change.
How to install scrutinize
npx skills add thananon/9arm-skills# or add only this skill to Claude Code: copy the folder
skills/engineering/scrutinize/
# into
~/.claude/skills/scrutinize/ (all projects)
.claude/skills/scrutinize/ (one project)
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