Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare destructiveHint=true, readOnlyHint=false and idempotentHint=true, so the safety profile is covered. The description adds beyond the structured data by flagging 'WRITE: requires the ADMIN role,' an authorization prerequisite not encoded anywhere else, though it says nothing about reversibility or failure behavior.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.