Diagnose

by emdash-cms

Diagnose is a Quality skill for Claude Code, published by emdash-cms in emdash.

11.6K stars1.1K forkson emdash-cms/emdashAdded 2026/07/19Repository updated 2026/08/06

View source on GitHub Download repo ZIP

astrocmsemdashtypescript

Install in seconds

Install Diagnose

Copy Diagnose into your Claude Code skills folder. Run the command in your terminal, or review the source on GitHub before installing.

terminal

npx degit https://github.com/emdash-cms/emdash/tree/main/.flue/skills/diagnose ~/.claude/skills/diagnose

Requires Node.js. Downloads this skill only — not the rest of the repository — into your Claude Code skills folder.

Without Node.js

git clone https://github.com/emdash-cms/emdash.git

Clones the whole repository, then copy the skill’s own directory into your skills folder yourself.

In this catalog

Source file: .flue/skills/diagnose/SKILL.md in emdash-cms/emdash
Installs to: ~/.claude/skills/diagnose
Collection: One of 25 skills cataloged from this repository
Category: Quality — 1897 skills

What Diagnose does

Trace from a reproduced symptom to the source code that causes it, identifying the specific file and approximate line. Rate confidence honestly.

Diagnose is cataloged under Quality on DirSkills. Diagnose comes from a repository tagged astro, cms, emdash and typescript.

Documentation

README

Excerpt

Diagnose

The reproduce stage gave you a symptom -- a failing test, a captured screenshot, a console error, a wrong HTTP response. Your job is to find the code that produces that symptom and explain why, in enough detail that the verify stage can decide whether it is a bug and the fix stage can act if it is.

You read code. You do not modify it. No edits, no test runs, no demo boots. The state of the working tree should be the same when you finish as when you started.

Hard prohibitions

No git commit, no git push, no edits to source.
No GitHub writes. Read-only gh reads only.
No curl to arbitrary external hosts.
Do not touch any issue other than the one being investigated.

This is the opening of the README. Read the full README on GitHub.

Frequently asked about Diagnose

What else does emdash-cms publish alongside Diagnose?
Diagnose is one of 25 skills that DirSkills catalogs from emdash-cms/emdash, the repository it ships in. Its siblings there include API & CLI Bug Reproduction, Adversarial Code Reviewer and Agent Browser. Each one is a separate skill with its own page in this directory, installs the same way Diagnose does, and is maintained by emdash-cms in that same repository. The rest of the collection is listed on the emdash-cms/emdash page.
How does Diagnose compare to other Quality skills?
Diagnose ranks #176 by stars among the 1897 Quality skills in this catalog. The most-starred ones next to it are Benchmark, Benchmark Optimization Loop and API Design Patterns. DirSkills ranks by the star count of the repository each skill ships in, so that order reflects how popular those repositories are rather than any review of Diagnose against them. Open each page to compare what they document and how they install.