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Systematic diagnostic strategy with decision tree for reproducing, isolating, and tracing bugs. Use when investigating bugs, crashes, or unexpected behavior. Complements systematic-debugging workflow with concrete diagnostic patterns.
Codex または Claude でインストール この Prompt をコピーして Codex、Claude、または他のアシスタントに貼り付けると、Skill ページを確認してインストールできます。
SOC 職業分類に基づく
Web accessibility checklist covering WCAG guidelines, ARIA patterns, keyboard navigation, color contrast, screen reader support, and form accessibility. Use when building UI components, reviewing frontend code, or when accessibility is mentioned.
When to refactor vs leave alone, code smell detection, safe refactoring steps, and common transformation patterns. Use when asked to refactor code, clean up technical debt, or when reviewing code that shows structural problems.
Authentication and authorization patterns including JWT vs sessions, OAuth flows, token refresh, RBAC, and password handling. Use when implementing login, signup, token management, role-based access, or reviewing auth security.
Structured research methodology with scoping, multi-source collection, triangulation, source credibility scoring, and anti-hallucination guards. Use when investigating technologies, comparing tools, evaluating libraries, exploring unfamiliar codebases, or producing research reports.
Build MCP (Model Context Protocol) servers in TypeScript or Python. Use when creating custom tools, resources, or prompts that extend AI assistant capabilities via MCP.
Structured logging patterns, log levels, trace IDs, and what to log vs what never to log. Use when setting up logging, choosing log levels, implementing request tracing, or reviewing log output quality.
| name | debugging |
| description | Systematic diagnostic strategy with decision tree for reproducing, isolating, and tracing bugs. Use when investigating bugs, crashes, or unexpected behavior. Complements systematic-debugging workflow with concrete diagnostic patterns. |
| metadata | {"version":"1.0"} |
| allowed-tools | Bash Read |
Bug reported → Can you reproduce it?
├─ Yes → Is it consistent?
│ ├─ Yes → Add breakpoint/logging at suspected location → Trace
│ └─ No (intermittent) → Race condition or timing issue → Add timestamps to logs
└─ No → Check environment differences
├─ Works locally, fails in CI → Compare env vars, paths, timezone
├─ Works for others, fails for me → Check local config, versions, OS
└─ Cannot reproduce anywhere → Get reproduction steps from reporter
| Symptom | Likely Cause | Check |
|---|---|---|
| Works locally, fails in CI | Env vars, file paths, timezone | Compare environments |
| Intermittent failure | Race condition, flaky test, timeout | Add logging, increase timeout |
| Null/undefined error | Missing null check, async ordering | Trace data flow backwards |
| Memory growing | Unclosed resources, event listener leaks | Heap snapshot before/after |
| Slow response | N+1 queries, missing index, large payload | Profile, check query count |
| CORS error | Missing headers, wrong origin, preflight | Check server response headers |
| 403/401 | Token expired, wrong scope, missing header | Inspect request headers |
| "It worked yesterday" | Dependency update, config change, data change | Check git log, dep diff, recent deploys |
| Passes alone, fails in suite | Shared state between tests, order dependency | Run in isolation, check setup/teardown |