Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden. It transparently indicates a listing operation and that the server parameter is optional for scoping. It does not disclose additional behavioral details such as permissions, output shape, or what happens when the server parameter is omitted, but the operation itself is low-risk and clearly read-oriented.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.