Agents don't run. They behave. Same input produces a distribution of outputs, not an answer. Once behavior replaces output, the whole premise of testing shifts.
We require decision traces, calibrated uncertainty, and interpretability from every AI agent before we'll trust it. For ourselves, we call these "nice to have when the calendar clears."
Teachable Machine works because transfer learning constrains the problem. The same constraints that make fast demos possible also define where they fail.
Modern agent systems rediscovered coordination, but forgot the shared board that makes uncertainty explicit, auditable, and adaptable under real-world ambiguity.