Diagnose

Q: What is a Claude Code skill and how does the Diagnose skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Diagnose is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the General category. Learn more at https://claudskills.com/learn/what-is-skill-md/.

Category: General · Sub-category: general-misc · Last updated: 2026-05-21

type:debug

Bundle a redacted, support-grade snapshot of the current nyann state for inclusion in a bug report or support request. Combines explain-state + doctor + git config (token-redacted) + installed hook contents + nyann user-config (token-redacted) + check-prereqs into a single JSON or human-readable summary. TRIGGER when the user says "nyann is broken", "nyann diagnose", "diagnose nyann", "diagnose this repo", "support bundle", "what's wrong with nyann", "help me file a bug report", "what should I include in a nyann bug report", "/nyann:diagnose". Do NOT trigger on "is this repo healthy" — that's `doctor` (read-only audit). Do NOT trigger on "what does nyann see here" — that's `explain-state` (lighter snapshot, no health, no hook contents). Do NOT trigger on "fix this repo" — that's `retrofit`.

From the source SKILL.md

Read-only support bundle. Aggregates everything a maintainer needs to reproduce or pinpoint a nyann bug into one paste-friendly output.

What this skill does

Diagnose is a community-contributed Claude Code skill in the general-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/diagnose/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The Diagnose Claude Code skill is built for Claude Code users and developers across all disciplines looking for general-purpose AI assistance. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 116,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/diagnose
curl -L https://claudskills.com/skills/diagnose/SKILL.md \
  -o ~/.claude/skills/diagnose/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/diagnose/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/diagnose/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\diagnose\SKILL.md on Windows. See the full install guide for step-by-step instructions.

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Diagnose Claude Code skill?

Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/diagnose/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.

What does the Diagnose skill do?

Is this skill free to install?

Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.

When should I use the Diagnose skill?

Use Diagnose when your Claude Code task falls under the General category — specifically in the general misc area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Diagnose" or describe the task and let Claude pick). Browse related skills at /category/general/.

What is a Claude Code skill and how does the Diagnose skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Diagnose is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the General category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Source: https://github.com/thettwe/nyann
Author: thettwe

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA

thettwe. (2026). Diagnose [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/diagnose/

BibTeX

@misc{diagnose-2026,
  author    = {thettwe},
  title     = {Diagnose [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/diagnose/}
}

Embed this skill

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Badge

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Part of ClaudSkills — the open registry for Claude Skills & Claude Code Skills. · What's New · Install guide · About · llms.txt

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