Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full behavioral burden. It discloses the kind of information returned (passed steps, refusals, reasons) and implicitly signals a read-only operation, but it does not explicitly state side-effect freedom, error behavior, or response shape.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.