The review passed. The deployment failed. An engineer moved a code-review agent to a free server. The model answered correctly in every test. Then the server hit its quota at 2:47 PM on day three. Fourteen pull request verdicts vanished with the session. No state. No logs. No retry. This is the reviewer's blind spot. Teams test models obsessively. They rarely test the runtime underneath. This guide covers one decision: refusing a free server for an agent. It lists red flags, better alte...