Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is fully covered structurally. The description adds nothing beyond the route: no note on pagination, response shape, whether it includes checked-in accessories, or error behavior for unknown user ids. With annotations doing all the work, this is a minimal contribution.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.