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Your prompt change broke 3 things you didn't test: a 50-line stdlib eval harness for LLM outputs

This story is from 2026-09-27. It is preserved in the archive; the latest stories are on the live feed.

You tweak a system prompt to fix one bad answer. It works, so you ship it. Two days later someone notices the JSON output lost a field, the refusal case now answers anyway, and the summaries doubled in length. Nothing crashed and no test failed, because nothing was testing the prompt. This post sho…

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  1. 2026-09-27 18:56 · DEV Community — AI
    Your prompt change broke 3 things you didn't test: a 50-line stdlib eval harness for LLM outputs

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