Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
readOnlyHint=true already tells the agent this is a safe, non-mutating read, and the description does not contradict that. Beyond safety it adds nothing: no indication of whether it reports a locally installed bridge or a connected remote one, whether a connection is required, or what fields come back. With annotations covering only safety, this is a thin disclosure.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.