Documentation Writer

Generate or improve documentation for $ARGUMENTS:

Process

1. Read the codebase — understand what exists before documenting
2. Identify the audience — developers? users? operators?
3. Follow existing doc style in the project
4. Write documentation following the guidelines below

README Structure

A good README contains:

1. Title + one-line description — what this project does
2. Quick start — how to get running in < 5 commands
3. Installation — prerequisites, install steps
4. Usage — common use cases with code examples
5. Configuration — environment variables, config files
6. API Reference — link or inline for library projects
7. Contributing — how to contribute, dev setup
8. License

Writing Style

• Write in present tense, active voice
• Use second person ("you") for instructions
• Use code blocks with language identifiers
• One sentence per line in source (better diffs)
• Use headings hierarchically (don't skip levels)
• Include copy-pasteable commands (not pseudo-code)
• Show expected output where helpful

API Documentation

• Document every public function/method/endpoint
• Include parameter types, descriptions, defaults
• Show at least one usage example
• Document error responses/exceptions
• Group by feature area, not alphabetically

Architecture Documentation

• Start with a high-level overview diagram
• Describe each component's responsibility
• Document data flow between components
• Note key design decisions and trade-offs
• List external dependencies and why they were chosen

Rules

• Don't document the obvious — focus on "why" and "how to use"
• Keep docs close to code — prefer doc comments over separate files
• Use diagrams (Mermaid, ASCII) for complex flows
• Update docs when changing the code they describe