Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already convey read-only, idempotent, and non-destructive behavior. The description adds valuable context: the fields returned, the historical time range, and the distinction between corpus person ids and roster ids. However, it does not mention rate limits or pagination behavior beyond the schema's limit parameter, so a perfect score is not warranted.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.