# Diagnose

> Debug failures, failing tests, broken commands, bugs, and performance regressions

- Skill: `tt-a1i/diagnose` (Agent Skill)
- Install (CLI): `npx skillmds@latest add tt-a1i/diagnose`
- Raw SKILL.md: https://api.skillmd.com/api/skills/tt-a1i/diagnose/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: tt-a1i (https://skillmd.com/u/tt-a1i)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/tt-a1i/diagnose

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Reproduce, isolate, hypothesize, instrument, and verify a fix.

CAPABILITY: diagnose