Most AI agents are not failing because the model is useless.

They fail because nobody defined what “working” means.

A chatbot can answer a question and still fail the actual workflow. An agent can call a tool and still use the wrong parameter. A model upgrade can look better in a demo but silently break your most important use case.

This is why vibe-testing is dangerous.

If you are building agentic AI workflows, you need a small evaluation process before you ship.