Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare destructiveHint=true, indicating destruction. Description confirms deletion and adds context about clearing sensitive data. It does not disclose idempotent behavior (already in annotations) or other side effects, but given annotations, the description adds moderate value.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.