Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations declare readOnlyHint=true and destructiveHint=false, so the safety profile is already known. The description adds context about the checklist varying by family composition and nationality, and that the final list is always confirmed by a specialist—this is useful behavioral information beyond the annotations. No contradiction; the added variability and confirmation details justify a 4.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.