Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnly, idempotent and non-destructive, so safety is covered. The description adds substantive behavior beyond that: withdrawn, expired, changed-address or stale-version records fail hard rather than falling back to a different record, and published availability may be unknown. It does not say what error or payload the caller gets on failure.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.