Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries full burden for behavioral disclosure. It only states the basic action, omitting important details such as whether permissions are affected, if multiple files can be moved, if the operation is reversible, or any side effects like automatic removal of old parents (though a parameter hints at this).
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.