What is documentation-writer?

A set of rules for writing and maintaining project documentation such as README files, setup guides, API references, tutorials, and code comments.

It helps document installation, commands, features, configuration, APIs, examples, deployment, and important code behavior.

It keeps documentation short, understandable, and aligned with how the software actually works.

documentation-writer — Skill for Codex by lsantosweb

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.

Any agent

npx skills add lsantosweb/codex-agents-skills-kit --skill documentation-writer

Clone the repo

git clone --depth 1 https://github.com/lsantosweb/codex-agents-skills-kit

Made for: Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/lsantosweb/codex-agents-skills-kit/documentation-writer/github.svg)](https://agentmods.dev/skills/lsantosweb/codex-agents-skills-kit/documentation-writer)

Your own site

<a href="https://agentmods.dev/skills/lsantosweb/codex-agents-skills-kit/documentation-writer"><img src="https://agentmods.dev/badge/skills/lsantosweb/codex-agents-skills-kit/documentation-writer/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/lsantosweb/codex-agents-skills-kit/documentation-writer"><img src="https://agentmods.dev/badge/skills/lsantosweb/codex-agents-skills-kit/documentation-writer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 30 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 211 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00030	$0.00211
Opus 5.5	$0.00012	$0.00084
Sonnet 5.5	$0.00006	$0.00042
Haiku 4.5	$0.00003	$0.00021

Measured 2mo ago against content hash 58a940292680, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

documentation-writer 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 2mo 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.

.codex/skills/documentation-writer/SKILL.md · 46 lines

What it actually says

When to use

Use this skill only for explicit documentation work:

README
setup docs
API docs
ADR
changelog
tutorial
JSDoc/TSDoc/docstrings

Core operating rules

Prefer short, scannable, useful documentation.
Optimize for the actual audience.
Include examples when practical.
Keep docs aligned with code reality.
Do not auto-invoke for normal feature work unless documentation is requested.

Recommended structures

README

one-line summary
quick start
features
configuration
scripts
deployment or usage notes

API docs

endpoint purpose
request/response examples
auth behavior
error cases

Mandatory checks

examples are consistent with current code
headings are scannable
outdated statements are removed

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.

2mo ago First seen · 46 lines · 30 tokens per session scan A 58a940292680

Subscribe to this mod's changes

documentation-writer is a skill published in the GitHub repository lsantosweb/codex-agents-skills-kit (2 stars, last pushed 7mo ago), licensed MIT. It adds 30 tokens to every session and 211 once invoked, about $0.0001 per session on Opus 5.5. 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.

Writing and docs

documentation-writer next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
documentation-writerlsantosweb/codex-agents-skills-kit	Skill	2	7mo ago	MIT	A	30	Codex
imagegenopenai/codex	Skill	133k	yesterday	Apache-2.0	A	113	Codex
playwright-climicrosoft/playwright	Skill	99k	yesterday	Apache-2.0	A	19	Claude Code
local-ai-agentsmicrosoft/ai-agents-for-beginners	Skill	79k	4d ago	MIT	A	200	Claude Code, Codex
systematic-debuggingobra/superpowers	Skill	313k	3d ago	MIT	A	21	Claude Code
next-cache-components-adoptionvercel/next.js	Skill	143k	yesterday	MIT	A	95	Claude Code
next-partial-prefetching-adoptionvercel/next.js	Skill	143k	yesterday	MIT	A	103	Claude Code