AgentSkills Specification
The official AgentSkills specification defining the SKILL.md format used by Claude Code, Codex, Copilot, and 20+ AI coding tools. 14.7K stars.
Official Agent Skills specification and documentation repo. Defines the SKILL.md format used by Claude Code, Codex, Copilot, and 20+ other AI coding tools.
- Create portable skill files that work across different coding assistants
- Publish a reusable skill to the community marketplace
- Validate your skill format before sharing it with your team
The official AgentSkills specification defining the SKILL.md format used by Claude Code, Codex, Copilot, and 20+ AI coding tools. 14.7K stars. The standard behind the ecosystem.
Skill authors and tool builders who want to create portable skills that work across multiple AI coding assistants.
https://github.com/agentskills/agentskills
By agentskills
How to Get It
This is a methodology or approach. Paste the instructions below into a Claude conversation to get started.
Nothing to install — this is the specification repo. Read the docs at https://agentskills.io and the spec at https://agentskills.io/specification
Tip: Paste this into a Claude Code conversation. Verify command matches your Claude Code version.
After installing, paste this into Claude:
Help me create portable skill files that work across different coding assistants
Trust Signals Reviewed
Community Pulse Active
Discussed on Hacker News, Reddit
- Agent Skills is now an open standard — Reddit · 558 pts
- Agent Skills — Hacker News · 544 pts
- SkillsBench: Benchmarking how well agent skills work across diverse tasks — Hacker News · 364 pts
3 mentions across 2 sources
Reviewer notes
Reviewed review. These are observations, not a security certification.
The spec itself — defines how skills work across the ecosystem. Foundational reference.
2026-05-10: Useful if you're building skills or agent workflows that need to run across multiple AI coding tools without rewriting instructions per platform—SKILL.md gives you a common format that Claude Code, Copilot, and others nominally support. The catch: this is a spec repo, not a runtime, so portability is only as good as each tool's actual implementation, and that varies. Check whether your specific target platforms have shipped SKILL.md execution support before betting a workflow on it; 15K stars signals ecosystem momentum, but production adoption (7 mentions) is still thin.
Things to check
- This is a specification repository, not a runtime—you still need to implement SKILL.md support in each tool you target. Adoption depends on whether your chosen AI platforms actually recognize and execute the format.
How to evaluate tools before deploying →
Data shown here comes from public APIs and automated scanning. Reviewer notes reflect one person's experience. This is not a security certification or legal recommendation. Always evaluate tools according to your own organization's policies.
Evaluation
The spec itself — defines how skills work across the ecosystem. Foundational reference.