Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden of behavioral disclosure. It compensates well for the missing output schema by documenting the specific returned fields (firstName, lastName, email), but omits error handling details (e.g., what happens if the user is not found), authentication requirements, or explicit confirmation that this is a safe read-only operation.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.