Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The readOnlyHint=true annotation already indicates a safe read operation, and the description's 'Get' aligns with that. It adds the behavioral context that authentication is required (via 'authenticated user') and names the returned fields, providing value beyond the annotation without contradicting it.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.