Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, so the safety profile is covered. The description adds genuinely new behavioral context: results are ordered newest-first and pagination is driven by a nextCursor fed back as offset, which the schema does not reveal (there is no cursor parameter defined).
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.