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

Reddit r/AI_Agents News

Summary

The article discusses techniques to identify prompt degradation upon model updates, such as using pinned evaluation cases and model testing matrices, and inquires about best practices for evaluating AI agents in production.

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, a matrix of which models each template was actually tested on, and a failing check if the score drops below the pinned threshold. For people running agents in production: - Do you pin eval cases per prompt, or evaluate whole agent runs? - How do you score free-text outputs without an LLM judge drifting too? - Do you re-run evals on every model update, or on a schedule?
Original Article

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