Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already mark destructiveHint and idempotentHint, but the description adds specific behavioral detail: only pending tasks are affected, completed tasks are irreversible, and already-cancelled tasks are no-ops. It also discloses the access tier restriction. This meaningfully supplements the structured annotations without contradiction.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.