Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, and destructiveHint false, so the description's claim of retrieving recent samples is consistent. It adds minor behavioral context (chunk size via selector) but does not disclose details like ordering or time window interpretation, which are partially in schema.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.