Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already communicate mutability, non-destructiveness, and idempotency. The description adds valuable context by explaining the state transition from pending to applied, the consequence for prompt construction, and the concrete no-op behavior on active notes. It does not contradict the annotations and provides meaningful behavior beyond their generic hints.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.