SkillsMar 29, 2026·1 min read

Agent Skills Standard — Cross-Platform AI Skills

The shared Agent Skills format used by Claude Code, OpenAI Codex, and Gemini CLI. Write skills once, use across all major AI coding tools.

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Quick Use

Use it first, then decide how deep to go

This block should tell both the user and the agent what to copy, install, and apply first.

Create a skill in any compatible AI coding tool:

.claude/skills/my-skill/SKILL.md    # Claude Code
.codex/skills/my-skill/SKILL.md     # OpenAI Codex
.gemini/skills/my-skill/SKILL.md    # Gemini CLI

Intro

Anthropic, OpenAI, and Google have converged on a shared Agent Skills standard defined at agentskills.io. Skills are folders with a SKILL.md file containing YAML frontmatter + markdown instructions. Write once, use across Claude Code, Codex CLI, and Gemini CLI.

Skill Format

---
name: my-skill
description: What this skill does
triggers:
  - pattern: "*.test.ts"
    description: Activate for test files
---

## Instructions

Your skill instructions here. The AI agent reads these
when the skill is activated.

Compatible Tools

Tool	Skills Directory	Stars
Claude Code	`.claude/skills/`	83,900+
OpenAI Codex	`.codex/skills/`	68,200+
Gemini CLI	`.gemini/skills/`	99,400+
GitHub Copilot	`.github/skills/`	27,500+

Official Skill Repositories

Anthropic Skills — 17 official skills (105k stars)
Claude Code Templates — 600+ community skills
GitHub Awesome Copilot — Copilot skills & plugins

Source & Thanks

Standard: agentskills.io Anthropic: anthropics/skills OpenAI: openai/codex Google: google-gemini/gemini-cli

Related Assets

OpenAI Codex & Cookbook Official Collection

Official OpenAI resources: Codex CLI coding agent and the OpenAI Cookbook with prompting guides for GPT-5.2, Codex, and more.

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OpenAI Cookbook — Official Prompting Guides

Official prompting guides from OpenAI: GPT-5.2, Codex, Meta Prompting, and Realtime API guides. The definitive reference for OpenAI model optimization.

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OpenAI Codex CLI

OpenAI's official coding agent CLI. Supports Agent Skills, custom prompts, and IDE integration. The open-source alternative to ChatGPT for code.

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