agent-skills: Instructions file for Codex

AGENTS.md

agent-skills AGENTS.md is an instructions file for Codex, OpenCode from fiveonecode/agent-skills. It costs 236 tokens per session, scanned A, original, MIT.

A guide for a repository containing 51 Code-owned Agent Skills. Each skill is a folder with a SKILL.md file that defines what the skill is and how it works.

In plain words
What is it for?
Use it when adding or removing skills, updating the bootstrap list and README, or checking that installation references and public files are safe.
Why use it?
It prevents contributors from editing generated copies or adding unsupported packaging and compatibility layers.

Instructions file for CodexOpenCode

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

This is fiveonecode/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 →

Reuse

Borrowing it

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

README.md
[![agentmods](https://agentmods.dev/badge/instructions/fiveonecode/agent-skills/agents-md/github.svg)](https://agentmods.dev/instructions/fiveonecode/agent-skills/agents-md)
Your own site
<a href="https://agentmods.dev/instructions/fiveonecode/agent-skills/agents-md"><img src="https://agentmods.dev/badge/instructions/fiveonecode/agent-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 agent-skills AGENTS.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/fiveonecode/agent-skills/agents-md"><img src="https://agentmods.dev/badge/instructions/fiveonecode/agent-skills/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 236 This file is loaded in full into every session.
When invoked 236 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 $0.00236 $0.00236
Opus 5.5 $0.00094 $0.00094
Sonnet 5.5 $0.00047 $0.00047
Haiku 4.5 $0.00024 $0.00024

Measured 2mo ago against content hash 0d7aeef1169c, 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 · 20 lines

What it actually says

Agent Guide

This repository is a direct package of 51Code-owned skills. Each top-level skill directory contains a SKILL.md; the front matter is the source of truth for its name and description.

  • Edit skill source here, never in installed consumer copies.
  • Keep bootstrap.sh pinned to [email protected] and explicit skill names. Use #ref for reviewed tags; when upstream has no stable tag and the manager cannot resolve a raw commit, fetch and verify that exact commit before passing its local checkout to the manager.
  • Do not add a registry, generated catalog, lock generator, sync planner, or backward-compatibility layer.
  • Keep WORKFLOW.md and scripts/verify.sh as the small, non-mutating Autopilot and Symphony integration boundary.
  • When a skill is added or removed, update the owned list in bootstrap.sh and README.md in the same change.
  • Keep public changes generic. Do not commit credentials, machine paths, internal task links, private context, or company-only notes.
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 · 20 lines · 236 tokens per session scan A 0d7aeef1169c

Subscribe to this mod's changes

agent-skills AGENTS.md is an instructions file published in the GitHub repository fiveonecode/agent-skills (20 stars, last pushed 4d ago), licensed MIT. It adds 236 tokens to every session, about $0.0009 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

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

agent-skills AGENTS.md next to 6 instructions from other repositories
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agent-skills AGENTS.mdfiveonecode/agent-skillsInstructions file204d agoMITA236Codex, OpenCode
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vscode copilot-instructions.mdmicrosoft/vscodeInstructions file195kyesterdayMITA3,093GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harnessInstructions file274k2d agoMITA4,313Codex, OpenCode