2 min lesson
Evals make “done” definable
Make the call in this situation: "In a Cursor FDE interview, why is hand-waving on 'how do you know it works?' a uniquely costly mistake?" Explain what supports it.
Step 1 of 3
Evals make “done” definablethe operational version of a success metric
An FDE who can't define success criteria can't define done. "The migration script works" is not a finish line. "The script converts 412 of our 430 components, the other 18 are flagged for manual review and zero introduce a type error" is a finish line a customer can sign off on.
Interactive diagram. Tab through its regions; each focused region shows its detail in the panel below.
The right column is what a senior customer engineer will run unattended.
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Full explanation
Full explanation
“I don't ship a workflow I can't measure. Before I build, I write down the success metric and a small eval set that operationalizes it. That's what lets me tell you, with a number, whether this is ready for your team or not.”