# Diagnose

> Use when the user needs failure triage, blocked-lane diagnosis, or root-cause decomposition before the next gate can move.

- Skill: `justinedevs/diagnose` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add justinedevs/diagnose`
- Raw SKILL.md: https://api.skillmd.com/api/skills/justinedevs/diagnose/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: JustineDevs (https://skillmd.com/u/justinedevs)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/justinedevs/diagnose

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# Diagnose

Use this skill inside Codex when a lane is blocked, a symptom is vague, or the next useful move is to decompose the failure before editing code. `diagnose` is a non-gating helper skill.

## Output

Produce:
- observed symptom
- likely failure slices
- missing evidence or missing reproduction steps
- smallest next probe
- exact next trigger, usually the owning lane or `$maestro`

## Rules

- Decompose the problem before proposing broad fixes.
- Prefer the smallest reproducible boundary that can confirm or kill a hypothesis.
- Keep release-state ownership with the gated lane that is blocked.
- Escalate assumptions clearly when evidence is still incomplete.