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.
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.
Why it matters
Scoring whether one natural language instruction produced the right Playwright action gives browser agents a real regression suite, instead of arguing over whether a whole task succeeded.
