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Catch Prompt Regressions Before Users Do: A Free-Tier Harness

This story is from 2026-08-26. It is preserved in the archive; the latest stories are on the live feed.

Last week I changed one line in a system prompt. The demo looked great. Then a support ticket arrived: the bot started refusing valid requests. The root cause wasn't the model. It was my prompt edit. And I had no way to prove the change was safe before shipping it. That's the problem this article s…

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  1. 2026-08-26 11:26 · DEV Community — AI
    Catch Prompt Regressions Before Users Do: A Free-Tier Harness

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