AI Agents Don't Know When They're Wrong. Here's...

Your eval suite showed 91st-percentile quality scores. Your production logs show the agent confidently told a customer the wrong return policy three times last Tuesday. Both of these facts can be true simultaneously. They usually are. And until more teams internalize why, quality will remain the #1 barrier to production AI deployment — not because the evals are wrong, but because measuring quality and enforcing it are different operations. According to LangChain's State of Agent Engineering 2026