Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare this is a non-read-only, idempotent, non-destructive operation, so the safety profile is covered. The description adds real behavioral value beyond that by disclosing what happens to in-flight work: pending deliveries are held rather than dropped, which matches destructiveHint=false and tells the agent this is reversible. It still says nothing about permissions or rate limits.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.