Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already cover read-only, idempotent, non-destructive and closed-world behavior. The description adds important context beyond annotations: the returned record contains the visitor's personal data, intended for the site's owner. It does not mention auth requirements explicitly, but the owner framing covers the access scope.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.