Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already convey that this is mutating, idempotent, and non-destructive. The description adds role requirements and clarifies the operation is a move rather than a general update. However, it doesn't disclose what happens to child nodes, whether parentId=null moves to root, or how placement ordering works, though annotations reduce the burden.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.