AI coding glossary
SKILL.md
Also known as: skill markdown, agent skills format
In one sentence
The file format of the open Agent Skills standard, Markdown with YAML frontmatter that defines a portable AI instruction set.
Full definition
SKILL.md is the file format of the open Agent Skills standard. It pairs a YAML frontmatter block (`name`, `description`, `version`, `category`, optional `platforms`) with a natural-language body of instructions. The format is intentionally minimal so the same file works in every AI coding tool. The Skills-Hub registry indexes 4,900+ SKILL.md files from 100+ official sources (Anthropic, Google, Microsoft, Vercel, Cloudflare, Stripe, Supabase) plus community contributions. The format spec is open and the parser (@skills-hub-ai/skill-parser) is MIT-licensed.