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Write the eval before the prompt
Oct 6, 2026

Write the eval before the prompt

Every LLM feature I've shipped went through the same loop: tweak the prompt, try five examples, feel good, ship, then get a bug report the five examples never covered. The fix is one we already know from testing. Build the eval set first, from real failures, and make the prompt the thing that has to pass it.

Oct 6, 20267 min read1 reactions0 comments