Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already cover readOnly, idempotent, openWorld, and destructive hints. The description adds a meaningful behavioral detail beyond those annotations: tasks are returned ordered by priority desc then updated_at desc. It does not mention not-found behavior, but the low complexity and output schema reduce that need.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.