Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden of disclosing behavioral traits. It states that MIDI notes are transposed, implying a mutating operation, but it does not mention whether the change is destructive, reversible, or whether it has any side effects. The clarification about audio clips is a scope boundary, not a behavioral disclosure.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.