Your agent gives a confident answer. It sounds right, your tests say PASS, and it is completely made up. A test that only checks "did it finish the task" never catches a lie. It gets worse across a conversation: an agent can start safe and drift, one reasonable sounding turn at a time, into advice it should never give. This talk shows how to catch both: spot a fabricated answer with zero-shot detection that needs no labeled training data, score every turn so you see drift as it happens instead of only grading the final answer, and add a real-time guardrail that swaps an unsafe answer for a safe one before the user ever sees it.