Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries full burden for behavioral disclosure but fails to specify whether this operation is destructive (modifies the original track), whether it creates a new mono track alongside the stereo one, or if it is reversible via undo. The instruction to select first is the only behavioral guidance provided.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.