Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare destructiveHint=true, but the description adds valuable behavioral context: the fallback behavior for reports, and reversibility via list_archive/restore_from_archive. This goes beyond just saying 'destructive' and helps the agent understand consequences, exceeding what annotations alone provide.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.