Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the burden; it discloses that outputs are sanitized and that latency, credit use, scores, and state are returned, and 'Return' signals a read-oriented operation. It does not explicitly state side effects, auth requirements, or error behavior, but for a status query the disclosed behavior is reasonably complete.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.