An AI agent ingests a customer ticket, queries three internal APIs, looks up a record in a database, drafts a response, and hands it off to a human reviewer. Every individual call returns a 200. The unit tests pass. The integration tests pass. The response gets approved.
A week later, the support team notices the agent has been quietly recommending the wrong refund tier for one product category — for nine days. Nothing crashed. Nothing logged an error. The system did exactly what its tests said it should do.
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