Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the burden of communicating behavior. The verb 'List' implies a read-only operation moderate transparency, and 'servers known to eMule' adds useful context about scope. However, it does not clarify whether this is a cached/local list, whether it triggers any network activity, or how the state field is represented.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.