Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Since no annotations are provided, the description carries the full burden. It discloses that client names are never returned and that the tool also provides a way to see the system running, which is useful behavioral context. However, it could specify the exact output format or any side effects, but for a zero-param read-like tool this is acceptable.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.