Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries full burden. It discloses that the tool returns metadata and URLs but no body content. This is transparent for a read-only listing tool. However, it does not mention potential pagination, ordering, or rate limits, but for a simple list without parameters, the description is adequate.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.