Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations at all, so the description carries the full burden and delivers almost nothing: it does not say this is a mutating reorder, whether it is undoable (an undo sibling exists), whether it affects all folders or only the current one, or what permissions it needs. The phrase "inside every folder" is the only real behavioral signal — scope — which lifts it above a 1.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.