Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, so safety profile is covered. The description adds the specific returned attributes (nome, UPN, e-mail), which is useful behavioral detail beyond the annotations, but does not mention pagination or default limits.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.