Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries full burden. It discloses only the core action 'Select a track' but does not reveal side effects (e.g., whether it changes the current track focus, highlight in UI, or interacts with other tools). No error handling or reversibility is mentioned, leaving significant behavioral unknown.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.