What Are Agent Skills? SKILL.md Guide for Claude & Codex

What are Agent Skills, and how should you use them?Agent Skills are reusable folders of instructions and supporting files. SKILL.md normally contains a name, trigger description, and working instructions; references, scripts, templates, and examples can live beside it.How to evaluate an Agent Skill

Read SKILL.md and check the trigger scope.

Inspect scripts, network access, filesystem changes, and credentials.

Check the repository license and activity.

Install at project or personal scope intentionally.

Search Agent Skills.