Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The readOnlyHint annotation already establishes this is a safe read, but the description adds useful behavioral context: the endpoint is GET /account/users, and the response includes name, email, id, and active status. It does not cover pagination or rate limits, but it goes beyond the structured fields.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.