From Rewrite Loop to Test Loop

Lin's team needs to stop subjective prompt churn. What changed in the after workflow? Before: rewrite after every bad draft. After: test, tag, then revise. The team moved from changing the prompt after each opinion to running every version on the same saved inputs. They defined success criteria before judging outputs, so "better" became measurable instead of rhetorical. They tagged failures before editing. That turns the next prompt change into a hypothesis, not a hunch. Iterate on evidence, not vibes. Prompt evaluation loop Built a practical test loop for prompt changes. The after scene should show stable cases and failure…

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