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 states the core behavior (returns running status and URL) but does not disclose edge-case behavior such as what is returned when the server is not running (null URL, error, or false flag). The 'running' semantics are also undefined.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.