Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, and non-destructive behavior. The description adds the bounded-page behavior, user scoping, and the Markdown return format, which go beyond annotations. It does not describe ordering or default page size, but that is a minor gap given the safety annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.