Documentation

When to use

Use this skill when you need to create, review, or improve technical documentation following the Diátaxis framework. Examples include:

• Creating user guides
• API documentation
• Tutorial content
• Restructuring existing documentation to better serve different user needs and contexts

Instructions

Organize documentation into four distinct types — tutorials, how-to guides, reference material, and explanations — each serving different user needs and contexts.

Always ask clarifying questions about the user's context, audience, and goals before creating documentation.

Step 1 — Identify the documentation type

Use the following decision checklist based on user signals:

Quick decision tree:

• Is the user learning by doing for the first time? → Tutorial
• Do they need to solve a specific problem they already understand? → How-to guide
• Do they need technical facts to look up? → Reference
• Do they want conceptual background? → Explanation

Step 2 — Apply type-specific patterns

Tutorials (learning-oriented)

• Title pattern: Start with a verb — "Build your first X", "Create a Y from scratch"
• Structure: Goal → Prerequisites → Numbered steps → Immediate verifiable result at each step → Final outcome
• Minimise explanation; maximise doing
• Every step must produce a visible, testable result
• Validation: A beginner must be able to complete the tutorial without external help

Example intro:

"In this tutorial, you will build a simple REST API using Express. By the end, you will have a running server that responds to GET requests. No prior Express experience is needed."

How-to guides (problem-oriented)

• Title pattern: Frame as a task — "How to configure X", "How to deploy Y to Z"
• Structure: Goal statement → Assumptions/prerequisites → Numbered steps → Expected result
• Assume baseline knowledge; skip conceptual explanations
• Allow for variation; note alternatives where they exist
• Validation: An experienced user can complete the task without confusion or backtracking

Example intro:

"This guide shows how to add JWT authentication to an existing Express app. It assumes you have a working Express server and basic familiarity with middleware."

Reference (information-oriented)

• Title pattern: Name the thing — "Configuration options", "API endpoints", "CLI flags"
• Structure: Consistent repeatable format per entry (name → type → default → description → example)
• State facts; avoid instruction beyond minimal usage examples
• Keep current; version-stamp if needed
• Validation: A user can look up a specific fact in under 30 seconds without reading surrounding content

Example entry:

timeout (integer, default: 5000) Maximum time in milliseconds to wait for a response before the request fails. Example: { timeout: 3000 }

Explanations (understanding-oriented)

• Title pattern: Frame as a concept — "How X works", "Understanding Y", "Why Z is designed this way"
• Structure: Context → Core concept → Alternatives/trade-offs → Higher-level perspective
• Avoid step-by-step instruction or technical specification
• Validation: After reading, the user can explain the concept in their own words and understands the rationale behind design decisions

Example intro:

"Authentication and authorisation are often confused. This page explains the distinction, why both matter, and how common patterns (sessions, tokens, OAuth) approach each concern differently."

Step 3 — Maintain separation and integration

• Keep each document a single type — don't mix tutorial steps with reference tables or conceptual digressions
• Cross-link between types: a tutorial can link to the relevant reference page; a how-to guide can link to an explanation for background
• Use consistent headings and terminology across all types so users can navigate the full documentation system

Step 4 — Validate before delivering

Benchmark

Scenario: .benchmarks/scenarios/documentation-001-diaxis-split.md · Run: 2026-08-31 · Log: .benchmarks/runs/2026-08-31/documentation-001-diaxis-split.json

PASS (run 2026-08-31). Haiku +33 (67→100); frontier models already at ceiling. No regressions. Gate per .agents/skills/skill-optimizer/rules/release-gates.md.