skills: Instructions file for Codex

AGENTS.md

skills AGENTS.md is an instructions file for Codex, OpenCode from antfu/skills. It costs 1,476 tokens per session, scanned A, original, MIT.

A documentation-based guide for creating reusable instructions for coding agents, including generated, synced, and hand-written skills.

In plain words
What is it for?
Use it to generate skills from projects such as Vue, Nuxt, Vite, and UnoCSS, or sync existing skills from projects such as Slidev and VueUse.
Why use it?
It helps turn project documentation into focused agent instructions without copying irrelevant user guides or creating unnecessary reference material.

Instructions file for CodexOpenCode

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

This is antfu/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 →

View source ↗ antfu/skills
About the project

Anthony Fu's Skills is a curated collection of instructions that guide coding agents in using particular tools, frameworks, and development practices. It is mainly aimed at projects using technologies such as Vite, Nuxt, Vue, TypeScript, and related JavaScript tooling. The catalogue entries are skills and instructions from this collection.

antfu/skills · 6,043 stars · on GitHub

Reuse

Borrowing it

Nothing to install: this file belongs to antfu/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/antfu/skills/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/antfu/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/antfu/skills/agents-md/github.svg)](https://agentmods.dev/instructions/antfu/skills/agents-md)
Your own site
<a href="https://agentmods.dev/instructions/antfu/skills/agents-md"><img src="https://agentmods.dev/badge/instructions/antfu/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/antfu/skills/agents-md"><img src="https://agentmods.dev/badge/instructions/antfu/skills/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 1,476 This file is loaded in full into every session.
When invoked 1,476 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 $0.01476 $0.01476
Opus 5.5 $0.00590 $0.00590
Sonnet 5.5 $0.00295 $0.00295
Haiku 4.5 $0.00148 $0.00148

Measured 1mo ago against content hash 687b6401fa1c, 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 1mo 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

Copies of this mod

2 near-identical copies found in the catalogue:

AGENTS.md · 208 lines

How it starts

The opening of the file, as written. The whole thing — 208 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: 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
│
└── skills/                     # Output directory
    └── {output-name}/
        ├── SKILL.md           # Index of all skills
        ├── GENERATION.md       # Tracking metadata (for generated skills)
        └── references/
            └── *.md            # Individual skill files

Important: For Type 1 (generated), the skills/{project}/ name must match sources/{project}/.

Workflows

For Generated Skills

Adding a New Project

Read the full file on GitHub · 208 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. 1mo ago Changed · -46 lines · -443 tokens per session 687b6401fa1c
  2. 2mo ago First seen · 254 lines · 1,919 tokens per session scan A 874b156c9a0f

Subscribe to this mod's changes

skills AGENTS.md is an instructions file published in the GitHub repository antfu/skills (6,043 stars, last pushed yesterday), licensed MIT. It adds 1,476 tokens to every session, about $0.0059 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 2026-08-30.

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.mdantfu/skillsInstructions file6.0kyesterdayMITA1,476Codex, 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