Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, openWorldHint, and destructiveHint=false, so the safety profile is covered. The description adds genuinely new behavioral information absent from annotations: results are paged and the next page is driven by page.nextCursor with a preserved limit, which is useful for pagination loops.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.