code-documentation-patterns

A guide to writing and reviewing software documentation, including decision records, API references, README files, runbooks, and code comments.

In plain words
What is it for?
Use it when documenting an API, recording an architectural choice, onboarding contributors, reviewing a change, or checking documentation quality.
Why use it?
It helps keep documentation accurate and useful instead of allowing stale explanations and undocumented decisions to mislead developers.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/mickeyyaya/refactoring-skills/code-documentation-patterns
Any agent
npx skills add mickeyyaya/refactoring-skills --skill code-documentation-patterns
Clone the repo
git clone --depth 1 https://github.com/mickeyyaya/refactoring-skills

Made for: Claude Code, Codex.

Per session 68 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 5,072 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00068 $0.05072
Opus 5 $0.00034 $0.02536
Sonnet 5 $0.00014 $0.01014
Haiku 4.5 $0.00007 $0.00507

Measured 3d ago against content hash 7f21221f7f4b, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

code-documentation-patterns scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/code-documentation-patterns/SKILL.md · 546 lines

How it starts

The opening of the file, as written. The whole thing — 546 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Code Documentation Patterns

Overview

Stale docs erode trust, misleading comments introduce bugs, and undocumented architectural decisions get re-litigated every six months. Use this guide to write documentation that stays accurate, helps future contributors, and scales with the codebase.

When to use: Adding a new public API, recording an architectural decision, onboarding a new team member, reviewing PRs for documentation completeness, or auditing a codebase for documentation health.

Quick Reference

Pattern Core Idea Primary Red Flag
Architecture Decision Record Document context, decision, and consequence in a lightweight file Decision made verbally, never written down; team re-debates the same choice
API Documentation (OpenAPI/AsyncAPI) Machine-readable contract that doubles as human-readable reference Docs generated from code only, never from intent; drifts from actual behavior
JSDoc / Docstrings Inline structured comments on public interfaces Missing param types, stale return descriptions, no examples for complex behavior
README Standards Orientation doc covering purpose, setup, usage, and runbook README last updated two major versions ago; no local-run instructions
Inline Documentation Explain why, not what; annotate non-obvious decisions Comments restate the code; intent buried; nothing explains the workaround
Technical Debt Register Intentional debt tracked with owner, cost, and due date // TODO comments with no date, owner, or ticket reference
Documentation Anti-Patterns Stale docs, misleading comments, commented-out code Committed code blocks that "might be useful later"

Patterns in Detail

1. Architecture Decision Records (ADR)

An ADR captures the context, decision, and consequence of a significant technical choice. It is the single artifact that prevents a future engineer from re-opening a settled debate without understanding why it was settled.

Read the full file on GitHub · 546 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 3d ago First seen · 546 lines · 68 tokens per session scan A 7f21221f7f4b

Subscribe to this mod's changes

code-documentation-patterns is a skill published in the GitHub repository mickeyyaya/refactoring-skills (6 stars, last pushed 5mo ago), licensed MIT. It adds 68 tokens to every session and 5,072 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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