Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden of explaining behavior. It discloses the action (selecting a range based on cursor position) and the target (end of track), but it does not mention whether the existing selection is replaced, extended, or how the tool behaves if there is no active cursor position.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.