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skills: Instructions file for Codex

AGENTS.md

skills AGENTS.md is an instructions file for Codex, OpenCode from skymavis/skills. It costs 803 tokens per session, scanned A, original, MIT.

A repository instruction file that tells coding agents how to create and maintain reusable skills. It defines the required files, naming rules, reading order, and checks to complete before a pull request.

In plain words
What is it for?
Use it when authoring or updating skills in the skymavis/skills repository, especially before running its validator or opening a pull request.
Why use it?
It gives contributors one shared process and prevents skills from breaking the repository's format or validation rules.

Instructions file for CodexOpenCode

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

This is skymavis/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 1repo 2mo ago A scan 803 tokens original MIT
View source ↗ skymavis/skills
Reuse

Borrowing it

Nothing to install: this file belongs to skymavis/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/skymavis/skills/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/skymavis/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
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Your own site
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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/skymavis/skills/agents-md"><img src="https://agentmods.dev/badge/instructions/skymavis/skills/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 803 This file is loaded in full into every session.
When invoked 803 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 $0.00803 $0.00803
Opus 5.5 $0.00321 $0.00321
Sonnet 5.5 $0.00161 $0.00161
Haiku 4.5 $0.00080 $0.00080

Measured 2mo ago against content hash be338e9a854b, 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 · 56 lines

How it starts

The opening of the file, as written. The whole thing — 56 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md — the skills repo

You are an agent authoring and maintaining reusable agent skills in this repo. This file governs how to work here; each skill's own SKILL.md governs how to use that skill.

Read order (every task)

  1. This file.
  2. README.md — the catalog and layout.
  3. scripts/validate_skills.py — the contract you must satisfy.
  4. CONTRIBUTING.md — the authoring workflow and local dev loop.
  5. The target skill's SKILL.md.

The skill contract (self-check before running the validator)

  • A skill is a folder skills/<name>/ containing a SKILL.md.
  • Folder name == frontmatter name, kebab-case ^[a-z0-9-]+$, ≤ 64 chars, no leading/trailing/consecutive hyphen, and not anthropic/claude.
  • Frontmatter is a top-of-file YAML block fenced by --- … ---. Allowed keys only: name, description, license, allowed-tools, metadata, compatibility. name and description are required.
  • description: non-empty, ≤ 1024 chars, third person, no angle brackets. It is the trigger surface — say what the skill does and when to use it.
  • SKILL.md body ≤ 500 lines (budget). Push depth into references/.
  • Relative links in SKILL.md must resolve.

Authoring discipline

  • Each skill is self-contained under skills/<name>/: scripts/ (executable logic), references/ (depth loaded on demand), assets/ (templates/files the skill emits), tests/ (pytest, with a conftest.py that injects scripts/ onto sys.path).
  • Prefer the standard library; declare any extra test deps in the skill's requirements-dev.txt (CI always installs pytest).
  • Progressive disclosure: keep SKILL.md lean; depth goes in references/.
  • Don't hand-format SKILL.md line shape. pre-commit runs mdformat --wrap 100 over every SKILL.md, so write prose in whatever line shape and let the hook reflow it (it leaves tables, code blocks, and long URLs intact). Run pre-commit run --all-files and commit the result; CI checks the same fixed point.

Read the full file on GitHub · 56 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 · 56 lines · 803 tokens per session scan A be338e9a854b

Subscribe to this mod's changes

skills AGENTS.md is an instructions file published in the GitHub repository skymavis/skills (1 stars, last pushed 2mo ago), licensed MIT. It adds 803 tokens to every session, about $0.0032 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 2026-09-01.

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.mdskymavis/skillsInstructions file12mo agoMITA803Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscodeInstructions file195ktodayMITA9,719GitHub Copilot
next.js AGENTS.mdvercel/next.jsInstructions file143ktodayMITA7,461Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscodeInstructions file195ktodayMITA5,649GitHub Copilot
langchain AGENTS.mdlangchain-ai/langchainInstructions file149ktodayMITA4,680Codex, OpenCode
vscode copilot-instructions.mdmicrosoft/vscodeInstructions file195ktodayMITA3,093GitHub Copilot
vscode model-prompts.instructions.mdmicrosoft/vscodeInstructions file195ktodayMITA2,022GitHub Copilot