Most teams ship an agent, watch a few demos go well, and call it done. Then a model update lands, a prompt gets tweaked, and it starts failing silently in front of real people. No test suite catches it because there is no test suite.
We build one. Eval sets from your real traffic, adversarial tests that try to break the agent on purpose, and a reliability score you can actually trust. We did not have to build your agent to prove it. We just have to be able to run it.