Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden of behavioral disclosure. It does not state that deletion is permanent or irreversible, whether related bookings or schedules are affected, what permissions are required, or what the response will be. 'Delete' merely restates the action rather than disclosing its behavioral implications.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.