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agent-skills: Instructions file for Codex

AGENTS.md

agent-skills AGENTS.md is an instructions file for Codex, OpenCode from andrewsrigom/agent-skills. It costs 1,546 tokens per session, scanned A, original, MIT.

Repository instructions for maintaining reusable coding-agent skills, including their folder structure, routing rules, documentation limits, and quality standards.

In plain words
What is it for?
Use them when creating, reviewing, updating, or enforcing conventions in the agent-skills repository.
Why use it?
They give contributors shared rules for organizing skills clearly and keeping them easy to install and reuse.

Instructions file for CodexOpenCode

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

This is andrewsrigom/agent-skills's own configuration. It tells Codex and OpenCode how to work on agent-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 agent-skills configures →

not rated 2repo 7mo ago A scan 1,546 tokens original MIT
View source ↗ andrewsrigom/agent-skills andrewsrigom.github.io
Reuse

Borrowing it

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

Made for: Codex, OpenCode.

Wrote this? Show the measurements

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README.md
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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.

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<a href="https://agentmods.dev/instructions/andrewsrigom/agent-skills/agents-md"><img src="https://agentmods.dev/badge/instructions/andrewsrigom/agent-skills/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 1,546 This file is loaded in full into every session.
When invoked 1,546 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 $0.01546 $0.01546
Opus 5.5 $0.00618 $0.00618
Sonnet 5.5 $0.00309 $0.00309
Haiku 4.5 $0.00155 $0.00155

Measured 2mo ago against content hash 7c0866655023, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

agent-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 · 195 lines

How it starts

The opening of the file, as written. The whole thing — 195 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md

Purpose

This repo stores reusable OSS skill packs. Keep it optimized for:

  • clear skill routing
  • easy sharing
  • easy installation through skills.sh
  • repeatable refreshes from current official docs

When andrewsrigom asks to "enforce" something in this repo, default to codifying it here in AGENTS.md, not by adding scripts, CI, or automation, unless explicitly requested.

Repo shape

  • Group skills by technology at the repo root, for example next-intl/ or stripe/.
  • Each actual skill lives in its own folder and must contain a SKILL.md.
  • Supporting files inside a skill should usually be limited to:
    • references/
    • scripts/
    • assets/
  • Do not add extra docs inside skill folders such as README.md, CHANGELOG.md, or QUICK_REFERENCE.md.
  • Reusable repo-level prompt templates belong in .internal/prompts/.

Skill quality bar

  • Use skill-creator guidance when creating or updating skills.
  • Optimize for routing quality first. Split by decision-making surface, not by arbitrary file count.
  • Merge overlapping or weakly differentiated skills when one stronger skill would route more cleanly.
  • Split overloaded skills when they own too many unrelated decisions.
  • Keep SKILL.md lean. Move detailed material into targeted references/.
  • For code-facing skills, include at least one simple usage example directly in SKILL.md.
  • Avoid duplicate coverage across skills.
  • Keep references one level deep from SKILL.md. Do not build deep reference chains.
  • The folder name and the name: in SKILL.md frontmatter must match.
  • Every maintained skill should include a clear maintenance snapshot with:
    • docs verification date
    • current package or release snapshot when relevant
  • Prefer an opinionated execution shape over a docs-summary shape.
  • Do not add skills for advice a competent model would already produce reliably without repo-specific guidance.
  • New skills should earn their place by reducing common AI failure modes, not by restating obvious setup steps.
  • For implementation-facing skills, explicitly state:
    • the default path
    • when to deviate
    • what to avoid
    • how to verify the result

Read the full file on GitHub · 195 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 · 195 lines · 1,546 tokens per session scan A 7c0866655023

Subscribe to this mod's changes

agent-skills AGENTS.md is an instructions file published in the GitHub repository andrewsrigom/agent-skills (2 stars, last pushed 7mo ago), licensed MIT. It adds 1,546 tokens to every session, about $0.0062 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.

Building agents
Related

agent-skills AGENTS.md compared with instructions from other repositories

agent-skills AGENTS.md next to 6 instructions from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
agent-skills AGENTS.mdandrewsrigom/agent-skillsInstructions file27mo agoMITA1,546Codex, 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 file195ktodayMITA5,516GitHub Copilot
langchain AGENTS.mdlangchain-ai/langchainInstructions file149ktodayMITA4,680Codex, OpenCode
vscode copilot-instructions.mdmicrosoft/vscodeInstructions file195ktodayMITA3,093GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harnessInstructions file275k3d agoMITA4,313Codex, OpenCode