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Improve code structure without changing behavior. Use when refactoring, cleaning up, optimizing, simplifying, extracting methods, or reducing complexity. Requires tests BEFORE refactoring, small steps, commit after each green test.
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
Test API endpoints with proper authorization including Basic Auth and session cookies. Use when testing curl requests, checking API responses, getting 401 Unauthorized, session expired errors, or verifying endpoint behavior after changes.
Implement accumulated improvements from improvements-backlog into AI rules and skills. Use when backlog has 5+ items, weekly rule update cycle, 2+ high priority improvements exist, before important releases, when same error repeated 3+ times, when user says implement improvements/process backlog/update rules from errors.
Fix bugs, errors, exceptions, and unexpected behavior. Use when debugging, fixing errors, handling crashes, or when user mentions bug, error, broken, not working, crash, exception, 500 error, Application error, white screen, TypeError, undefined is not a function, or unexpected behavior.
Analyze Claude Code prompt cache efficiency and costs. Use when user asks about cache performance, token usage, session costs, how much a session cost, wants to optimize prompt caching, when costs seem high, when context window is filling up, or mentions cache-analyzer/cache hits/token costs/session metrics/cost analysis.
Review code for quality, security, and maintainability. Use when reviewing pull requests, examining code changes, doing QA checks, architecture review, or CTO review. Also trigger for COMPLEX tasks affecting more than 5 files, API contract changes, or data migrations.
Create new skills, modify and improve existing skills, create or update AI rules. Use when creating rules, building skills, adding coding standards, updating .claude/rules/ or .claude/skills/, converting Cursor rules to Claude Code, measuring skill performance, running evals, or optimizing skill descriptions.
| name | refactoring |
| description | Improve code structure without changing behavior. Use when refactoring, cleaning up, optimizing, simplifying, extracting methods, or reducing complexity. Requires tests BEFORE refactoring, small steps, commit after each green test. |
Principle: CHANGE STRUCTURE, NOT BEHAVIOR.
If behavior changes, it's NOT refactoring -- it's a feature or bugfix.
| Refactor When | Do NOT When |
|---|---|
| Code works but hard to understand | Code doesn't work yet |
| Duplicated code | No tests exist |
| Long methods (> 50 lines) | Under time pressure |
| Deep nesting (> 3 levels) | "Just because" |
1. VERIFY -> All tests pass
2. IDENTIFY -> What to refactor
3. PREPLAN -> Check file size limits (standard-file-size-limits rule)
4. PLAN -> Small steps
5. EXECUTE -> One step
6. TEST -> Tests after step
7. COMMIT -> Commit if green
8. REPEAT -> Next step
| Code Smell | Refactoring |
|---|---|
| Long Method (> 50 lines) | Extract Method |
| Duplicate Code | Extract Method/Class |
| Long Parameter List (> 4) | Parameter Object |
| Deep Nesting (> 3 levels) | Guard Clauses |
| Magic Numbers | Extract Constant |