agent skill — A reusable instruction file that teaches an agent how to do one job well — the procedure, the tools, and what counts as done.
AI agent — An AI system that doesn't just answer once but works toward a goal in a loop — taking actions, reading the results, and deciding what to do next.
Why it matters
Treats the expensive first run as a one-time cost that produces a durable artifact: a readable agent skillA reusable instruction file that teaches an agent how to do one job well — the procedure, the tools, and what counts as done.Full definition → file with selectors, fetches and CLI calls that later runs replay, instead of re-exploring the same site indefinitely.
