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.
eval — A repeatable test for AI quality — a set of tasks plus scoring — used the way software teams use test suites, because model output is too variable to judge by eyeballing.
embedding — A list of numbers representing a piece of text's meaning, so that similar meanings end up numerically close and can be searched.
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
If you're building an internal AI agentAn 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.Full definition → platform, this frames skills as the unit of capability and gives you the operational scaffolding most 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 → tutorials skip: a minimal registry, evalA repeatable test for AI quality — a set of tasks plus scoring — used the way software teams use test suites, because model output is too variable to judge by eyeballing.Full definition → to catch skills silently breaking on model updates, and thresholds for when to move from a flat list to embeddingA list of numbers representing a piece of text's meaning, so that similar meanings end up numerically close and can be searched.Full definition →-based routing and formal ownership.
Key quotes
“Skills are the new features.”
Yogi
“Skills without evals are really just wishful thinking.”
Yogi
“Skills are not the documentation and a lot of people treat them like that and skills are really the contracts versioned to a model.”
