Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full behavioral burden, and it discloses only the mutation itself. It does not say whether stopping resets the cue position, whether playback state persists, what happens if no cue list is playing (error vs no-op), or how the lighting output is left.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.