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The Diff Wasn't the Model: Fingerprint the Environment Before You Replay a Trace

This story is from 2026-10-26. It is preserved in the archive; the latest stories are on the live feed.

A replay failed at tool call seven. The run diff was clear and useless. The model had not changed. Our search_docs schema had. We replayed a two-week-old trace on a Tuesday. Step seven sent {"q": "retry policy"} . The new schema wanted {"query": "retry policy"} . The tool rejected the call, the age…

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  1. 2026-10-26 11:31 · DEV Community — AI
    The Diff Wasn't the Model: Fingerprint the Environment Before You Replay a Trace

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