Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries full burden for behavioral transparency. It only states that an empty MIDI clip is created, but does not disclose what happens if a clip already exists at the position, whether the clip is selected, or what return value or errors might occur.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.