Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are present, so the description carries the safety burden. The 'Files on disk are not touched' statement is a valuable disclosure that the operation is non-destructive to media files, but it does not reveal other meaningful behavioral traits such as whether the removal is reversible or what happens to series that reference the root folder.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.