Summary
If you're building Agent Skills packages for Codex CLI, GitHub Copilot, or Amp, this gives you the complete agentskills.io specification in one reference. It covers the frontmatter schema (name validation rules, required vs optional fields), directory structure conventions, and the progressive disclosure model that keeps skills under 500 lines for efficient context loading. The cross-tool compatibility section is handy since the same SKILL.md works everywhere, you just move it between .agents/skills and .github/skills. Honestly feels like documentation that should live in your editor when you're authoring skills instead of hunting through the spec site.
Install to Claude Code
npx -y skills add agentworkforce/relay --skill creating-agent-skills-skill --agent claude-codeInstalls into .claude/skills of the current project.
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SKILL.md
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Fastest browser for AI agents to run web automation tasks, always free.
Download Free life-time →Notes, actions and memory. Without a meeting bot. First month 100% off.
Download for free →belt cli automatically finds the best tools and skills for your agent. image, video, music, tts...
one prompt install →Connect your Claude agent to live crypto prices and trading routes via 1inch
Get the MCP →Block distracting apps from your iPhone permanently without a 3rd party app. Free and open source.
Block now (100% free) →
