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I got tired of breaking my LLM app with "one small prompt change", so I built a 450-line eval harness

Every LLM developer I know has the same workflow: tweak the prompt, eyeball three outputs, ship it. Then a user reports that the refund flow has been answering wrong for two days. The fix is evals, but the popular options all asked for more than I wanted to give: a SaaS account, a framework depende…

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  1. 2026-11-11 09:45 · DEV Community — AI
    I got tired of breaking my LLM app with "one small prompt change", so I built a 450-line eval harness

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