Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, and destructiveHint, so description does not need to repeat safety. The description adds value by specifying the types of statistics available (valid, invalid, failed, gas totals), but does not detail output format or pagination.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.