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Postmortem: A Cached Verdict Passed a Diff the Model Never Saw

This story is from 2026-10-20. It is preserved in the archive; the latest stories are on the live feed.

A verdict cache made the patch gate cheap and slow to notice. The gate kept returning green. The green belonged to an older diff. Root cause in one line: the cache key covered the prompt and the model name. It never covered the code. The gate itself worked. The lookup around it lied. What the gate…

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  1. 2026-10-20 10:06 · DEV Community — AI
    Postmortem: A Cached Verdict Passed a Diff the Model Never Saw

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