Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries full burden but only indicates mutation via 'Update'. It fails to disclose whether changing the parent moves subfolders/contents, if the operation is idempotent, or error conditions (e.g., circular parent references).
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.