Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true and destructiveHint=false, so safety is covered. The description adds genuinely new behavior: only public artifacts are listed, and unlisted ones never appear here but load via get_dashboard — a scoping constraint the agent needs. It also discloses the return envelope, though pagination defaults are left to the schema.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.