Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already establish this as a safe, read-only, idempotent, closed-world read, so the safety profile is covered. The description usefully adds behavior those annotations cannot express: newest-first ordering, a per-call cap, and the exact continuation/termination rule for pagination.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.