Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description carries the responsibility for explaining behavior. It states the main effect (moves the cursor) but gives no information about side effects like selection, playback, or undo behavior. For a simple cursor-move this is adequate but not rich.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.