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Schema Drift Is the Real Agent Bug: A Free-Model Contract Test

This story is from 2026-09-02. It is preserved in the archive; the latest stories are on the live feed.

Every agent bug I've chased lately looked like a reasoning failure. It wasn't. The model made a valid decision, then emitted an argument with quantity: "5" when the function expected quantity: 5 . A type error killed the call. The root cause was schema drift: the tool contract changed, but the prom…

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  1. 2026-09-02 13:45 · DEV Community — AI
    Schema Drift Is the Real Agent Bug: A Free-Model Contract Test

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