If you've used ChatGPT, Claude, Gemini or Copilot for more than a few months, you've probably typed the same instructions into a chat more times than you can count. Or opened a new chat and had to re-explain who you are and what you need, again. Or set up a custom GPT once, felt proud of yourself, and never opened it again. A Skill fixes all three of those, and it goes further than most people realise. Here's what a Skill actually is, why it's a different thing from a saved p