Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=false and destructiveHint=false, so the safety profile is covered. The description adds that only failed schedules are affected (successful ones untouched), but says nothing about what happens to already-succeeded deliveries, rate limits, or the result of the retry.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.