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skills: Instructions file for Codex

AGENTS.md

skills AGENTS.md is an instructions file for Codex, OpenCode from biw/skills. It costs 261 tokens per session, scanned A, original, MIT.

Repository instructions for maintaining biw/skills, a collection of installable tools for AI agents. They describe where skills go, how they are documented, and how to validate them.

In plain words
What is it for?
Use them when adding, documenting, testing, validating, or checking discoverability of skills in the repository.
Why use it?
They give contributors one shared set of rules, reducing inconsistent skill structure, missing documentation, and untested helpers.

Instructions file for CodexOpenCode

Written for Codex and OpenCode: the file is AGENTS.md.

This is biw/skills's own configuration. It tells Codex and OpenCode how to work on skills itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything skills configures →

not rated 2repo 1mo ago A scan 261 tokens original MIT
View source ↗ biw/skills
Reuse

Borrowing it

Nothing to install: this file belongs to biw/skills. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/biw/skills/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/biw/skills

Made for: Codex, OpenCode.

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.

agentmods badge for skills AGENTS.md

README.md
[![agentmods](https://agentmods.dev/badge/instructions/biw/skills/agents-md/github.svg)](https://agentmods.dev/instructions/biw/skills/agents-md)
Your own site
<a href="https://agentmods.dev/instructions/biw/skills/agents-md"><img src="https://agentmods.dev/badge/instructions/biw/skills/agents-md/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.

agentmods 80×15 button for skills AGENTS.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/biw/skills/agents-md"><img src="https://agentmods.dev/badge/instructions/biw/skills/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 261 This file is loaded in full into every session.
When invoked 261 The same file — it is already loaded in full.
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00261 $0.00261
Opus 5.5 $0.00104 $0.00104
Sonnet 5.5 $0.00052 $0.00052
Haiku 4.5 $0.00026 $0.00026

Measured 2mo ago against content hash 56625f1a49fd, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

skills AGENTS.md 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.

AGENTS.md · 16 lines

What it actually says

Repository Instructions

This repository publishes Agent Skills from biw/skills.

  • Put installable skills under skills/<skill-name>/SKILL.md.
  • When adding an installable skill, add it to the README's Available Skills list with a link and concise description.
  • Start from both templates under templates/skill/, including agents/openai.yaml.tmpl.
  • Keep the name frontmatter exactly equal to the parent folder name.
  • Write descriptions as clear trigger surfaces in 200 characters or fewer.
  • Keep starter material under templates/ with .tmpl suffixes so the CLI does not publish it.
  • Add scripts, references, and assets only when they directly support a skill; test executable helpers.
  • The skill installer copies every file below skills/<skill-name>/ except a few metadata/cache paths. Keep development tests exclusively under tests/<skill-name>/; never place *.test.* or *.spec.* files inside an installable skill directory.
  • Run pnpm validate before committing skill changes.
  • Use pnpm skills add . --list to smoke-test CLI discovery after at least one skill exists.
  • Do not commit scratch repos or generated output. .context/ is for local agent collaboration only.
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. 2mo ago First seen · 16 lines · 261 tokens per session scan A 56625f1a49fd

Subscribe to this mod's changes

skills AGENTS.md is an instructions file published in the GitHub repository biw/skills (2 stars, last pushed 1mo ago), licensed MIT. It adds 261 tokens to every session, about $0.0010 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.

Related

skills AGENTS.md compared with instructions from other repositories

skills AGENTS.md next to 6 instructions from other repositories
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