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.

Browse documentation skills on Agensi.

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.

Check out changelog-generator on Agensi.

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:

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 link

Code 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 code

Changelog

• Follow Keep a Changelog format
• Categorize: Added, Changed, Fixed, Removed
• Most recent version first
• Link to PRs where applicable

Find documentation skills at Agensi.