Anyone can ship a prompt. The engineer can prove it works — and prove the next version is better. That proof is evals. Descend.
⚡You tweaked the prompt, it "felt better", you shipped — and quietly broke ten cases you never checked.
LEVEL 1 — REMEMBER · the vocabulary
⚓ ANCHOR · IF YOU ALREADY KNOW
Evals are regression tests for output that isn't deterministic: instead of assertEqual you score against a rubric, your golden set is the test suite, and every change is gated on the number.