An AI that pursues a goal by taking actions in a loop: assess the situation, act (search, run, edit, call a system), look at what happened, act again — until done or stuck. You give it an outcome, not steps; the steps are its problem.
Why it matters: this is the shift everything else in this dictionary serves. You stop operating a tool and start delegating to a worker — which is why the rest of the vocabulary is suddenly about briefs, checkpoints, and supervision.