Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full behavioral burden. It conveys a read-only retrieval operation through 'Get' and is transparent about what is returned, including download URLs and acoustics. It stops short of detailing error behavior (e.g., 404 for unknown slug) or side effects, but for a simple getter the verb plus return details provide substantial transparency.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.