Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already establish readOnly/openWorld/non-destructive, but the description adds real substance: it lists the returned fields (claim state, listing-source freshness, accreditation names, canonical profile URLs) and explicitly negates availability claims and mixed-source ratings. That is meaningful behavioral disclosure beyond the structured hints.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.