What is llm-skill AGENTS.md?

Startup instructions for the llm-skill project, which provides skills and workflows for Codex, an AI coding agent.

Use them when loading the project, installing it into a workspace, validating its layout, or choosing the correct skill instructions.

They tell Codex which files are authoritative, how to route requests, and how to install and validate the project.

How hanyuancheung/llm-skill configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to hanyuancheung/llm-skill. 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/hanyuancheung/llm-skill/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/hanyuancheung/llm-skill

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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/hanyuancheung/llm-skill/agents-md.svg)](https://agentmods.dev/instructions/hanyuancheung/llm-skill/agents-md)

Your own site

<a href="https://agentmods.dev/instructions/hanyuancheung/llm-skill/agents-md"><img src="https://agentmods.dev/badge/instructions/hanyuancheung/llm-skill/agents-md.svg" alt="Measured on agentmods" height="20"></a>

Per session 485 This file is loaded in full into every session.

When invoked 485 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.

Model	Per session	Once invoked
Fable 5.1	$0.00485	$0.00485
Opus 5	$0.00243	$0.00243
Sonnet 5	$0.00097	$0.00097
Haiku 4.5	$0.00049	$0.00049

Measured 7d ago against content hash 8ed66e942b6d, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

llm-skill 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 7d 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 · 50 lines

What it actually says

AGENTS.md — Codex entrypoint

This is the Codex runtime boot file for the llm-skill project. It is a thin shell. All routing, contract, and lifecycle rules live in AGENT.md. Do not add domain knowledge here.

What Codex should do on load

Treat AGENT.md as the single source of truth. Read it first.
Route via AGENT.md §2 Skill Registry. Do not scan skills/ directly.
Respect the Execute → Distill → Guide loop defined in AGENT.md §1.
Language: the default SKILL.md is English. If the user writes in Chinese, prefer SKILL_zh.md when it exists.

Install (Codex CLI)

The repo is drop-in for Codex. From the target workspace:

# Option A: use this repo as the project root
git clone <this-repo-url> .

# Option B: mount into an existing project
git clone <this-repo-url> .codex-skills
ln -s .codex-skills/AGENT.md ./AGENT.md
ln -s .codex-skills/AGENTS.md ./AGENTS.md
ln -s .codex-skills/skills    ./skills

Then validate:

bash install.sh           # verifies layout
python3 scripts/validate.py

Codex will pick up AGENTS.md automatically at session start.

Minimal contract for Codex

Read: AGENT.md, chosen skills/<name>/SKILL.md (lazy).
Write: skills/<name>/SKILL.md only via distill; AGENT.md only via guide.
Never: write domain knowledge into AGENTS.md itself.

Pointers

Schema and routing → AGENT.md
Meta-skills → skills/execute/, skills/distill/, skills/guide/
New skill scaffold → skills/_template/
Changelog → CHANGELOG.md

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.

7d ago First seen · 50 lines · 485 tokens per session scan A 8ed66e942b6d

Subscribe to this mod's changes

llm-skill AGENTS.md is an instructions file published in the GitHub repository hanyuancheung/llm-skill (22 stars, last pushed 4mo ago), licensed MIT. It adds 485 tokens to every session, about $0.0024 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 2026-08-30.

Building agents

next.js AGENTS.md

AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.

vercel/next.js · 7,296 tokens

codex AGENTS.md

AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.

openai/codex · 5,182 tokens

vscode buildNext.instructions.md

Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).

microsoft/vscode · 6,785 tokens

llm-skill: Instructions file for Codex