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How do you catch a prompt that silently breaks when the model version changes?

This story is from 2026-09-15. It is preserved in the archive; the latest stories are on the live feed.

Our CI checks that every prompt template is structurally valid: schema, variables, a set of broken fixtures that must fail. What it doesn't catch is a template that still passes and quietly produces worse output on a newer model. The approach I'm leaning toward: a few pinned eval cases per template…

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  1. 2026-09-15 14:10 · r/AI_Agents
    How do you catch a prompt that silently breaks when the model version changes?

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