What Is SKILL.md? A Practical Guide to AI Agent Skills (opens in new tab)

If you work with AI coding agents, you have probably seen SKILL.md mentioned and wondered what it actually is. In a matter of months it went from one company's feature to a standard adopted across Claude Code, Cursor, Codex CLI, Gemini CLI and more. Here is the plain explanation, with no hype. What a skill actually is A skill is a folder containing a SKILL.md file that teaches an AI agent to do a specific task well. Instead of re-explaining your conventions, your workflow, or your standards e...