Explains how to find, choose, install and invoke agent skills (SKILL.md folders that follow the Agent Skills specification) in Claude Code, Codex, Gemini CLI and Cursor, each by its own documented mechanism. Use when a user asks "which skill should I use for this", "what skills do I have", "install this skill", "make one skill work in all my agents", "why isn't my skill triggering", "how do I run a skill by name" or "is this skill safe to install".
