HYBRID's (YC21) AI coach botched 1 in 4 chats and logged zero errors. The bug was a tool retry that kept misfiring. The agent still produced an answer every time, so analytics saw a completed session and observability saw a clean trace. The only thing that would have caught it was a conversion drop, far too late and very expensive. Almost every team shipping agents has some version of this blind spot right now. Analytics says a session happened and observability shows the trace. Neither of…