• 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.
• context window — The maximum amount of text a model can consider at once — its working memory for the current conversation or task.

A workable pattern for anyone writing agent skills or CLAUDE.md-style rules: lazy-load one skill per request instead of a monolithic context, and back the rules with machine checks plus negative fixtures rather than trusting the model to follow prose.

• videoSkills as the Interface to Agentic ProductsAI Engineer
• videoBuilding Great Agent Skills: The Missing ManualAI Engineer
• clipSKILL.md sets style; references disclose progressively; a CLI wraps the APIAI Engineer

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