Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Adds real context beyond the annotations: an owner-only authorization requirement and the fact that the user is prompted before the change. However, destructiveHint=true is left unelaborated – the description does not say that empty strings or nulls clear fields and that out-of-office ranges replace existing ones, which is the main risk an agent needs to know.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.