agent-skills AGENTS.md

agent-skills AGENTS.md is an instructions file for Codex, OpenCode from remix-run/agent-skills. It costs 882 tokens per session, scanned A, original, MIT.

Instructions for writing agent skills in the remix-run/agent-skills repository. They cover the required folder layout, naming rules, and SKILL.md format.

In plain words
What is it for?
Use it when authoring or reviewing a skill, its required frontmatter, trigger description, references, and supporting documentation.
Why use it?
It gives contributors a shared structure for creating skills that agents can find and activate consistently.

Instructions file for CodexOpenCode

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add instructions/remix-run/agent-skills/agents-md
Clone the repo
git clone --depth 1 https://github.com/remix-run/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/remix-run/agent-skills/agents-md.svg)](https://agentmods.dev/instructions/remix-run/agent-skills/agents-md)
Your own site
<a href="https://agentmods.dev/instructions/remix-run/agent-skills/agents-md"><img src="https://agentmods.dev/badge/instructions/remix-run/agent-skills/agents-md.svg" alt="Measured on agentmods" height="20"></a>
Per session 882 This file is loaded in full into every session.
When invoked 882 The same file — it is already loaded in full.
Security scan A 0 findings. Scan, not verified.
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 $0.00882 $0.00882
Opus 5 $0.00441 $0.00441
Sonnet 5 $0.00176 $0.00176
Haiku 4.5 $0.00088 $0.00088

Measured 5d ago against content hash 4ade44a3232b, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, 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 5d 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 · 165 lines

How it starts

The opening of the file, as written. The whole thing — 165 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Authoring Agent Skills

Guidelines for creating skills in this repository.

Directory Structure

Skills live in the skills/ directory:

skills/
└── skill-name/
    ├── SKILL.md          # Required - main entry point
    └── references/       # Optional - detailed topic docs

Naming

Use lowercase with hyphens. The directory name must match the name field in SKILL.md frontmatter:

  • react-router-framework-mode
  • react-router-data-mode
  • remix

SKILL.md Format

Follow the Agent Skills specification.

Required Frontmatter

---
name: skill-name
description: What this skill does. Be specific about when agents should activate it.
license: MIT
---

Recommended Sections

  1. Title & Intro - Brief overview of the skill
  2. When to Apply - Bullet list of specific trigger conditions
  3. References - Table mapping topics to reference files
  4. Version Compatibility - Feature/version requirements (if applicable)
  5. Critical Patterns - Most important patterns with code examples
  6. Further Documentation - Links to official docs

Example structure:

# Skill Name

Brief description of what the skill covers.

## When to Apply

- Specific condition that triggers this skill
- Another trigger condition
- Yet another trigger

## References

| Reference             | Use When       |
| --------------------- | -------------- |
| `references/topic.md` | Working with X |
| `references/other.md` | Implementing Y |

## Critical Patterns

Show the most important patterns here with code examples.

Size Guidelines

  • Keep SKILL.md under 500 lines
  • Move detailed reference material to references/
  • Include only the most critical patterns inline

Reference Files

Reference files provide detailed guidance on specific topics.

Frontmatter

---
title: Topic Name
description: Brief description of what this reference covers
tags: [relevant, searchable, tags]
---

Read the full file on GitHub · 165 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. 5d ago First seen · 165 lines · 882 tokens per session scan A 4ade44a3232b

Subscribe to this mod's changes

agent-skills AGENTS.md is an instructions file published in the GitHub repository remix-run/agent-skills (137 stars, last pushed 2mo ago), licensed MIT. It adds 882 tokens to every session, about $0.0044 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.

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