A computer-use agent can act through ordinary software controls, so a wrong click may change a business record before anyone reviews a suggestion. Before providing a real login, give it a separate rehearsal desktop with fictional records and no ability to create a real commitment. Make the environment resettable and introduce missing information, misleading instructions, interruptions, and other controlled failure situations during the drill. Observe whether the agent stops, asks for help, and leaves usable evidence. Review recovery as carefully as successful task completion. Promote capabilities gradually after the rehearsal produces evidence. A convincing demonstration alone does not justify access to live business systems. Original article explainer. AI-assisted conceptual illustration and neural narration; original synthesized music. Not a human recording or customer result.