Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare a non-destructive, idempotent write, but the description adds genuinely useful context beyond them: the cascade to subtasks and the reversibility via restore:true. It still says nothing about permissions or where archived items go.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.