Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden. It states the tool retrieves aggregate statistics, implying a read-only, non-destructive operation. No side effects are mentioned, but the simplicity of a parameterless, network-wide snapshot means no hidden surprises are expected. The description could add detail on freshness or caching, but it is sufficient.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.