Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, non-destructive and closed-world, so the safety profile is covered. The description adds that the result is an aggregate of counts plus date ranges, which is genuine behavioral context, but it says nothing about scope (whole corpus vs. filtered) or ordering of the returned newspapers.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.