skills: Instructions file for Codex

AGENTS.md

skills AGENTS.md is an instructions file for Codex, OpenCode from hairyf/skills. It costs 2,469 tokens per session, scanned A, a copy of skills AGENTS.md, MIT.

A project instruction file describing how to generate and maintain coding-agent skills from project documentation. It covers generated skills, synchronized vendor skills, and recommended writing practices.

In plain words
What is it for?
Use it when generating skills from documentation, syncing existing skills, or working on the skills generator and its source projects.
Why use it?
It gives contributors shared rules for deciding what documentation to include and how to keep skill content focused on useful coding guidance.

Instructions file for CodexOpenCode

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

This is hairyf/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 →

Reuse

Borrowing it

Nothing to install: this file belongs to hairyf/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/hairyf/skills/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/hairyf/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.

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README.md
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Your own site
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Per session 2,469 This file is loaded in full into every session.
When invoked 2,469 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 91% copy Near-identical to another mod 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 $0.02469 $0.02469
Opus 5.5 $0.00988 $0.00988
Sonnet 5.5 $0.00494 $0.00494
Haiku 4.5 $0.00247 $0.00247

Measured 2mo ago against content hash 07f1a6f06bb7, 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.

Origin

This is a copy

91% identical to skills AGENTS.md — 99 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

AGENTS.md · 287 lines

How it starts

The opening of the file, as written. The whole thing — 287 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Skills Generator

Generate Agent Skills from project documentation.

PLEASE STRICTLY FOLLOW THE BEST PRACTICES FOR SKILL: https://platform.claude.com/docs/en/agents-and-tools/agent-skills/best-practices

  • Focus on agents capabilities and practical usage patterns.
  • Ignore user-facing guides, introductions, get-started, install guides, etc.
  • Ignore content that LLM agents already confident about in their training data.
  • Make the skill as concise as possible, avoid creating too many references.

Skill Source Types

There are two types of skill sources. The project lists are defined in meta.ts:

Type 1: Generated Skills (sources/)

For OSS projects without existing skills. We clone the repo as a submodule and generate skills from their documentation.

  • Projects: Vue, Nuxt, Vite, UnoCSS
  • Workflow: Read docs → Understand → Generate skills
  • Source: sources/{project}/docs/

Type 2: Synced Skills (vendor/)

For projects that already maintain their own skills. We clone their repo as a submodule and sync specified skills to ours.

  • Projects: Slidev, VueUse
  • Workflow: Pull updates → Copy specified skills (with optional renaming)
  • Source: vendor/{project}/skills/{skill-name}/
  • Config: Each vendor specifies which skills to sync and their output names in meta.ts

Type 3: Hand-written Skills

For skills that are written by Anthony Fu with his preferences, experience, tastes and best practices.

You don't need to do anything about them unless being asked.

Repository Structure

.
├── meta.ts                     # Project metadata (repos & URLs)
├── instructions/               # Instructions for generating skills
│   └── {project}.md            # Instructions for generating skills for {project}
│
├── sources/                    # Type 1: OSS repos (generate from docs)
│   └── {project}/
│       └── docs/               # Read documentation from here
│
├── vendor/                     # Type 2: Projects with existing skills (sync only)
│   └── {project}/
│       └── skills/
│           └── {skill-name}/   # Individual skills to sync
│
└── skills/                     # Output directory (generated or synced)
    └── {output-name}/
        ├── SKILL.md           # Index of all skills
        ├── GENERATION.md       # Tracking metadata (for generated skills)
        ├── SYNC.md             # Tracking metadata (for synced skills)
        ├── references/
        │   └── *.md            # Individual skill files
        ├── scripts/            # Optional: executable scripts
        └── assets/             # Optional: templates, resources

Read the full file on GitHub · 287 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. 2mo ago First seen · 287 lines · 2,469 tokens per session scan A 07f1a6f06bb7

Subscribe to this mod's changes

skills AGENTS.md is an instructions file published in the GitHub repository hairyf/skills (26 stars, last pushed 23d ago), licensed MIT. It adds 2,469 tokens to every session, about $0.0099 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 91% identical to skills AGENTS.md, differing in 99 lines, and is treated as a copy.

Related

skills AGENTS.md compared with instructions from other repositories

skills AGENTS.md next to 6 instructions from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
skills AGENTS.mdhairyf/skillsInstructions file2623d agoMITA2,469Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscodeInstructions file195kyesterdayMITA9,719GitHub Copilot
next.js AGENTS.mdvercel/next.jsInstructions file143ktodayMITA7,461Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchainInstructions file149kyesterdayMITA4,680Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscodeInstructions file195kyesterdayMITA5,516GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscodeInstructions file195kyesterdayMITA3,093GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harnessInstructions file274k2d agoMITA4,313Codex, OpenCode