Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description carries the burden. It indicates a read-only 'Return' operation, which is transparent enough, but it does not disclose whether authentication is required, potential errors, or any other behavioral nuances. The additional details about the discovery block and disabled registration endpoints are content-specific, not behavioral.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.