Evaluation

In one line

Testing an AI system against a fixed set of cases so you know whether a change made it better or worse.

Picture it

A driving test. Not 'did it feel fine,' but a set course, scored the same way every time.

Under the hood

A case set with expected outcomes, scored automatically where possible (groundedness, correctness, cost), run on every prompt, model or tool change. Without it, every improvement is an anecdote.