Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the burden of behavioral disclosure. It clearly states what information the tool provides (source, computed date, licence, citation) and implies a read-only, informational operation. No hidden side effects or permissions are relevant given the zero-parameter scope.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.