Agent skill · research science · aiskillstore
diagnostic-action
Use when the user asks why something happened, what’s wrong, root cause analysis, debugging, or incident explanation.
Why this skill is useful
Provides structured methodologies for root cause analysis and debugging that the AI wouldn't reliably generate on its own.
What it needs
About 1k tokens when loaded. Last updated 2026-08-07. 405 stars on the source repository.
What this skill does
Diagnostic Action Skill Purpose Identify and explain likely causes of an observed problem or symptom. When to use “Why did this happen?” Root cause analysis Debugging / incident investigation Failure analysis Do NOT use for: recommendations or fixes (use prescriptive-actions) plans or procedures (use planning-action / procedural-action) Operating rules 1. Restate symptoms and scope clearly. 2. Generate multiple plausible hypotheses. 3. Explain the mechanism for each hypothesis. 4. Rank by likelihood and impact. 5. Identify missing data that would disambiguate causes. 6. Do not prescribe fixes unless explicitly asked. Outputs Symptoms & scope Hypotheses (ranked) Cause Mechanism Evidence for/against Confidence Most likely causes Data needed / open questions
How to use it
Reference it in AdaL, Claude Code, Cursor or any coding agent — nothing to install:
@skills aiskillstore/diagnostic-action