Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare this is a safe, idempotent, closed read. Beyond that, the description discloses the 100-result cap and the field scope of the payload (ids and display names only, no contacts or schedules), which are real behavioral limits an agent should know before relying on the output.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.