The era of enterprise AI agents has arrived — but not in the way the hype suggested. At the AI Agent Conference in New York this week, leaders from Datadog, T-Mobile, CrewAI, RingCentral, and others described a shift that's quietly changed the engineering conversation: building agents is the easy part now. Trusting them in production is the real problem. "One of the hardest things for humans to do is no longer building production systems. It's actually reviewing the vibe-coded software that gets shipped into production." — Ameet Talwalkar, Chief Scientist, Datadog What actually changed The bottleneck moved upstream. A year ago, the hard thing was getting agents to do anything useful. Now the hard thing is validating what they produce before it hits production — especially as AI coding agents generate code at a pace humans can't review comfortably. T-Mobile runs 200,000 AI-handled customer conversations per day. That's not a pilot. That took a year to build and involves serious governance investment.…