Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true and openWorldHint=true, so safety is covered. The description adds that results are 'newest' (recency ordering) and 'public' (access scope), which is useful beyond the annotations, but says nothing about pagination or result count.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.