Documentation is the highest-leverage use case for AI coding skills. Writing docs is time-consuming, follows predictable patterns, and most developers skip it. A documentation skill doesn't just save time — it ensures docs actually get written.
> Quick Answer: The best Claude code skills for documentation include README generation, API documentation, code comments/JSDoc, changelog generation, and architecture documentation.
README generation
README skills scan your project structure and generate a complete README. The best ones detect your language, framework, and tools automatically. They produce sections for installation, usage, configuration, contributing, and license — customized to what your project actually uses.
What separates a good README skill from a generic one: it reads your package.json, Dockerfile, CI config, and existing code to produce accurate installation steps instead of placeholders.
API documentation
API documentation skills generate OpenAPI specs from your code, produce endpoint reference pages, and create example request/response pairs. They're particularly valuable for teams where the API documentation falls behind the actual implementation.
The best API doc skills:
- Generate OpenAPI 3.x specs from annotated routes
- Produce curl examples for every endpoint
- Document error responses, not just success cases
- Include authentication requirements per endpoint
Code comments and JSDoc
Code comment skills define when and how to document code. They prevent both extremes — the codebase with zero comments and the one where every variable assignment has a comment.
A good comment skill says: document public function signatures with JSDoc/docstrings, explain *why* not *what* for inline comments, skip comments on obvious code, and update comments when the code changes.
Changelog generation
Changelog skills read your git history and produce changelogs following the Keep a Changelog format. They categorize changes (Added, Changed, Fixed, Removed), link to PRs, and group by version.
Architecture documentation
Architecture doc skills help Claude Code produce ADRs (Architecture Decision Records), system diagrams described in Mermaid syntax, and component documentation. These are the docs that rot fastest because they're the hardest to maintain manually.
Building your own documentation skill
Most teams have specific documentation standards that no generic skill covers. Start with this template:
```markdown
---
name: our-docs
description: Generates and updates documentation following team standards. Triggers on documentation, README, and doc writing tasks.
---
# Documentation Standards
README structure
1. One-line project description 2. Quick start (3 steps max) 3. Prerequisites 4. Installation 5. Usage with code examples 6. Configuration table 7. Contributing linkCode documentation
- JSDoc on all exported functions - @param with types and descriptions - @returns with type and description - @example with realistic usage - No comments on self-explanatory codeChangelog
- Follow Keep a Changelog format - Categorize: Added, Changed, Fixed, Removed - Most recent version first - Link to PRs where applicable ```---
*Find documentation skills at Agensi.*
