Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full disclosure burden. It clarifies that a new track is created, but omits critical behavioral details: whether the selected audio is moved (removed from original track) or copied, and whether the original track closes the gap or remains silent. This ambiguity is significant for a destructive-looking edit operation.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.