Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnly, openWorld, idempotent, and non-destructive behavior. The description adds valuable context: 'public' (visibility) and 'no-PHI' (privacy guarantee), which goes beyond the annotations. It does not contradict the annotations, and the added information is material for compliance.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.