Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description carries the full burden. It discloses only that the tool 'gets' data, but does not mention read-only behavior, pagination, authorization requirements, or what a 'calendar group' is. This is insufficient for a getter without annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.