Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already indicate this is non-readonly, idempotent, and non-destructive. The description adds meaningful behavioral context beyond those annotations by specifying that the operation is atomic and that it affects ALL rules. It does not detail stale-list failure behavior, but the schema covers that.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.