Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already mark readOnlyHint and destuctiveHint, and the description adds the own-students scope and recent time window as useful context. It restates 'Read-only' already captured by annotations and does not disclose ordering, pagination, or other response behavior; still, there is no contradiction.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.