Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden of behavioral disclosure. The verb 'list' implies a read-only retrieval, but the description does not specify return format, ordering, or whether the operation has any side effects. For a zero-parameter read-only list, this is minimally acceptable, though still thin.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.