Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already communicate that the tool is read-only and non-destructive. The description adds that it targets currently active visitors with geographic data, but does not disclose behavioral details such as authentication context, rate limits, or response shape. This is acceptable given the readOnlyHint, though not especially rich.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.