What are agent skills?

A skill is a small, portable folder that teaches any coding agent how to do one thing well.

An agent skill is a small folder — a SKILL.md plus any supporting files — that teaches a coding agent how to do one specific thing well: review a PR, write Playwright tests, set up Turnstile, follow your team's migration rules.

The format is deliberately boring. It's just files:

my-skill/
  SKILL.md        # frontmatter (name, description) + instructions
  reference.md    # optional supporting docs
  scripts/        # optional helpers

Because it's just files, the same skill works across every agent — Claude Code, Cursor, Codex, Copilot, Windsurf, and dozens more. Install once; each agent picks it up from its own config directory.

That portability is the whole point. The agentskills.io standard gave the ecosystem a shared format. Skill Studio gives it a registry: a place to publish once and have every agent install the current version.