What is skills AGENTS.md?

Repository instructions for maintaining a library of installable coding-agent skills. They describe the required file format, folder structure, and reference lists.

Use them when creating, editing, or documenting skills in that repository.

They help contributors add or change skills consistently without forgetting required metadata or catalogue links.

How agentara/skills configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to agentara/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/agentara/skills/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/agentara/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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/agentara/skills/agents-md/github.svg)](https://agentmods.dev/instructions/agentara/skills/agents-md)

Your own site

<a href="https://agentmods.dev/instructions/agentara/skills/agents-md"><img src="https://agentmods.dev/badge/instructions/agentara/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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/agentara/skills/agents-md"><img src="https://agentmods.dev/badge/instructions/agentara/skills/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 482 This file is loaded in full into every session.

When invoked 482 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	$0.00482	$0.00482
Opus 5.5	$0.00193	$0.00193
Sonnet 5.5	$0.00096	$0.00096
Haiku 4.5	$0.00048	$0.00048

Measured 2mo ago against content hash ecf7c541bfea, 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 · 53 lines

How it starts

The opening of the file, as written. The whole thing — 53 lines — stays where its author put it; the contents beside it link to each section on GitHub.

This file provides guidance to agents when working with code in this repository.

Repository Purpose

This is a personal library of skills — installable prompt extensions that give agent new capabilities. Each skill is a SKILL.md file containing a frontmatter block and a detailed instruction body.

Structure

skills/
  <category>/
    <skill-name>/
      SKILL.md

Current categories: aigc, engineering, health, productivity

Skill Format

Every SKILL.md must start with a YAML frontmatter block:

---
name: <kebab-case-slug>
description: >
  One or more sentences describing what the skill does and when it triggers.
  Include explicit TRIGGER conditions (keywords, user intents) and DO NOT TRIGGER
  conditions to help the model route correctly.
---

The body after the frontmatter is the full instruction set the model will follow when the skill is invoked.

Skill Reference Maintenance

Whenever adding or modifying a skill, update both reference lists that expose the skill:

Root README.md
Category README at skills/{category_name}/README.md

Keep each reference's link, name, and short description aligned with the skill's current behavior.

Key Design Patterns (from existing skills)

Multi-agent orchestration: Skills can spawn parallel subagents via the Agent tool. The main agent coordinates; subagents each inhabit a separate branch/task and report back.
Trigger conditions: The description field doubles as routing logic — be explicit about what user messages should and shouldn't activate the skill.
Memory integration: Skills that produce persistent outputs write to the project memory directory (/Users/danielwalnut/.claude/projects/*/memory/) using the standard frontmatter format and update MEMORY.md.
Mode switching: Complex skills define multiple modes (e.g., SIMULATE / RECALL / MANAGE) with explicit command words that switch between them.

Installing a Skill

Skills in this repo are meant to be symlinked or copied into ~/.claude/skills/<skill-name>/SKILL.md and ~/.agents/skills/<skill-name>/SKILL.md so the Claude Code and other agents can discover and load them.

Read the full file on GitHub · 53 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.

2mo ago First seen · 53 lines · 482 tokens per session scan A ecf7c541bfea

Subscribe to this mod's changes

skills AGENTS.md is an instructions file published in the GitHub repository agentara/skills (623 stars, last pushed 1mo ago), licensed MIT. It adds 482 tokens to every session, about $0.0019 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.

skills AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
skills AGENTS.mdagentara/skills	Instructions file	623	1mo ago	MIT	A	482	Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	yesterday	MIT	A	7,461	Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	MIT	A	4,680	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	274k	2d ago	MIT	A	4,313	Codex, OpenCode

skills: Instructions file for Codex