Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnly, idempotent, non-destructive and closed-world, so the safety profile is covered. With no output schema present, the description earns credit by disclosing the shape of what comes back (area, service, audience, receipt link, status). It says nothing about volume, ordering, or freshness of the list, which keeps it out of the top band.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.