Diagnose

What it does

When your agent uses it

• Works locally but not in staging/production
• Intermittent failures
• Correct code producing wrong results
• Operations succeeding but having no effect

Example prompts

• “why did this change?”
• “why is this happening?”
• “/diagnose”

Requirements

• Node.js

Workflow steps

5 steps, taken from the step headings in SKILL.md.

1. 1Understand the symptom
2. 2Build hypotheses
3. 3Choose the lightest evidence method
4. 4Gather evidence and iterate
5. 5Report the diagnosis

What it can do on your machine

Read from SKILL.md and the folder at commit 80bcfa4. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  Ships 3 files in scripts/ (JavaScript), which the agent can run.

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  No URLs in SKILL.md.

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names no API keys, tokens, secrets or passwords.

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Diagnose loads about 1.2k tokens when it runs, and up to ~2.3k if it reads all its reference files. Until then it costs about 205 tokens; SKILL.md has 437 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~205

When it runs · the whole SKILL.md, loaded when a task matches

~1.2k

With references · SKILL.md plus every file in references/, read only if the agent opens them

~2.3k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); the scripts in this folder are not scanned.

SKILL.md

The full file from avibebuilder/claude-prime at commit 80bcfa4, republished under its MIT licence (© avibebuilder). 437 words, ~1,174 tokens.

name

diagnose

description

Investigate unexpected behavior and mysterious bugs. Use when the cause of a problem is unknown and the user needs to understand WHY something is happening — symptoms like: sudden unexplained changes in metrics or behavior, works locally but not in staging/production, inconsistent or intermittent failures, correct code producing wrong results, operations succeeding but having no effect, environment-specific failures, duplicate executions, stale data, or any "why did this change?" or "why is this happening?" situation. Covers infrastructure anomalies (cache hit rates dropping, latency spikes, queue behavior shifts) as well as code bugs. The key signal is confusion about root cause, not a request to implement a known fix. Do NOT use for feature requests, known fixes, planning, or documentation tasks.

argument-hint

bug-description

## Diagnosis: [Issue Title]

### Symptoms
- [What was observed]

### Evidence
- [Finding] — `file:line` or runtime source — hypothesis X
- ...

### Root Cause
[Confirmed or most likely cause, with evidence]

### Hypotheses Tested
| # | Hypothesis | Confirm if | Eliminate if | Result |
|---|-----------|-----------|-------------|--------|
| A | ... | [what observation would prove this] | [what observation would rule this out] | Confirmed/Eliminated/Inconclusive |

### Recommended Next Steps
- [What to do next — usually hand off to `/fix` with this diagnosis]

### Active Instrumentation
- [List files with `#region agent log` blocks still in place, or `None`]

© avibebuilder, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 4 other files (scripts, references) in .claude/skills/diagnose of avibebuilder/claude-prime.

• SKILL.md
• references/runtime-debugging.md
• scripts/__tests__/diagnose-server.test.js
• scripts/diagnose-server.js
• scripts/package.json

Open the folder on GitHubat commit 80bcfa4

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in avibebuilder/claude-prime, which our catalogue first saw on October 7, 2026.

• majiayu000/claude-skill-registryskills/analysis/diagnose-avibebuilder-claude-prime