ReddRadar
Agent skill
cc-documentation-quality
Review documentation quality across README, comments, API docs, changelog, and AI documentation (CLAUDE.md, .cursorrules, copilot-instructions). Use when checking if documentation matches code, comments are stale, new features lack docs, or reviewing PR documentation. Triggers on: review docs, stale comments, update changelog, documentation debt, README accuracy, PR documentation review, missing docs.
Install this agent skill to your Project
npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/data/cc-documentation-quality
SKILL.md
Documentation Quality
STOP - Documentation Freshness
- Documentation rots faster than code. Stale docs are worse than no docs.
- If code changed, check which docs need updating - README, CLAUDE.md, API docs, comments
- Comments explain WHY, not WHAT - If it repeats the code, delete it
Core Principle
"The purpose of comments is to explain things that aren't obvious from the code." — Ousterhout, APOSD
Good documentation:
- Explains WHY, not WHAT
- Uses different words than the code
- Stays synchronized with implementation
- Describes the non-obvious
Documentation Checklist
1. README Accuracy
- Does README describe current behavior?
- Are setup instructions still valid?
- Do examples still work?
- Are dependencies current?
- Is the feature list accurate?
2. Comment Freshness
- Do comments match the code they describe?
- Are TODOs still relevant or stale?
- Do function comments match signatures?
- Are "temporary" comments actually temporary?
3. API Documentation
- Public interfaces have doc comments?
- Parameters documented with types and constraints?
- Return values documented?
- Exceptions/errors documented?
- Examples provided for complex APIs?
4. Changelog Updates
- Breaking changes documented?
- New features listed?
- Bug fixes noted?
- Migration instructions for breaking changes?
5. Comment Quality (APOSD)
- Comments describe non-obvious things?
- Comments use different words than code?
- Interface comments present (before implementation)?
- Comments explain "why", not "what"?
- No comments that repeat the code?
6. Missing Documentation
- New public APIs documented?
- New configuration options documented?
- New environment variables documented?
- New CLI flags documented?
7. AI Documentation
Check all AI config files that exist in the project:
| File | Tool |
|---|---|
CLAUDE.md |
Claude Code |
.cursorrules / .cursorignore |
Cursor |
.github/copilot-instructions.md |
GitHub Copilot |
AGENTS.md |
Copilot Workspace |
.windsurfrules |
Windsurf |
.aider.conf.yml |
Aider |
.continue/config.json |
Continue.dev |
.clinerules |
Cline |
.roomodes |
Roo Code |
CONVENTIONS.md |
Various |
- AI docs reflect current architecture?
- Agent/skill descriptions accurate?
- File structure documentation up to date?
- All AI config files consistent with each other?
- Version numbers synchronized?
Comment Anti-Patterns
| Anti-Pattern | Example | Problem |
|---|---|---|
| Repeat the code | i++ // increment i |
Zero value |
| State the obvious | // loop through users |
Noise |
| Stale comment | Comment says X, code does Y | Dangerous |
| TODO forever | // TODO: fix this from 2019 |
Clutter |
| Commented-out code | Dead code masquerading as comment | Confusion |
Comment Patterns That Add Value
| Pattern | Example | Value |
|---|---|---|
| Explain rationale | // Use insertion sort: n < 10 always |
Design decision |
| Warn about non-obvious | // Must call before X, else crash |
Prevent bugs |
| Summarize algorithm | // Binary search on sorted timestamps |
Quick understanding |
| Document edge case | // Empty list returns -1, not null |
Clarify behavior |
| Reference external | // Per RFC 7231 section 6.5.4 |
Authority |
Severity Guide
| Finding | Severity |
|---|---|
| README contradicts actual behavior | CRITICAL |
| API doc says wrong return type | CRITICAL |
| Stale comment causes bug risk | CRITICAL |
| CLAUDE.md describes deleted/renamed files | CRITICAL |
| New public API undocumented | IMPORTANT |
| Breaking change not in changelog | IMPORTANT |
| CLAUDE.md missing new features/agents | IMPORTANT |
| AI doc version mismatch | IMPORTANT |
| Stale TODO from distant past | SUGGESTION |
| Could add clarifying comment | SUGGESTION |
| Minor README improvement | SUGGESTION |
Questions to Ask
- "If someone reads only the docs, will they use this correctly?"
- "If the code changes, which docs need updating?"
- "Does this comment tell me something the code doesn't?"
- "Is this TODO actionable or just noise?"
Chain
| After | Next |
|---|---|
| Docs need code changes | Back to implementation |
| Docs verified | Done (pre-commit gate) |
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