Technical Writing for Developers

This skill provides best practices and templates for writing clear, maintainable internal documentation.

Core Principles

1. Audience Awareness: Write for your teammates (and your future self). Assume they know how to code, but not why this specific code exists.
2. Active Voice: Use active voice for instructions.
   • Bad: "The server should be started by running..."
   • Good: "Run npm start to start the server."
3. Single Source of Truth: Don't duplicate code logic in comments. Explain why, not what.
4. Front-Load Context: Put the most important information (what is this? how do I run it?) at the top.

Common Artifacts & Templates

1. README.md (Root or Component)

Every significant directory should have a README.

# [Project/Component Name]

[One-sentence description of what this is].

## Prerequisite

*   Node.js >= 20
*   [Other dependency]

## Quick Start

```bash
npm install
npm run dev

Architecture

[Brief explanation of how it works. Diagrams are great.]

Key Concepts

• Concept A: Definition...
• Concept B: Definition...

### 2. Architecture Decision Record (ADR)

Use for significant technical decisions.

```markdown
# [Short Title]

*   **Status**: [Proposed | Accepted | Deprecated]
*   **Date**: YYYY-MM-DD
*   **Deciders**: [List names]

## Context

[Describe the problem and constraints.]

## Decision

[Describe what we are doing.]

## Consequences

*   [Positive consequence]
*   [Negative consequence / Trade-off]

Style Guide

• Headers: Use Sentence case for headers (e.g., "Getting started" not "Getting Started").
• Code Blocks: Always specify the language for syntax highlighting (e.g., ```typescript).
• Lists: Use bullet points for options, numbered lists for steps.
• Links: Use relative links [Link](./path/to/file) so they work in the repo browser.

Review Checklist

Before committing documentation:

• Completeness: did I cover "how to run" and "how to test"?
• Freshness: Did I actually run the commands in a fresh terminal?
• Links: Do all internal links work?
• Grammar: Is it readable? (Use a spell checker).