# Engineering skills

- **[debug-mantra](./debug-mantra/SKILL.md)** — Four-mantra debugging discipline: reproduce → trace the fail path → falsify the hypothesis → cross-reference every breadcrumb.
- **[post-mortem](./post-mortem/SKILL.md)** — Write the canonical engineering record of a fixed bug — root cause, mechanism, fix, validation, how it slipped through.
- **[scrutinize](./scrutinize/SKILL.md)** — Outsider-perspective end-to-end review of a plan, PR, or code change.