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, but the description adds nothing beyond restating the endpoint: no indication of ordering, whether overdue tasks are flagged, whether completed tasks are excluded server-side, or what the payload looks like.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.