Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the burden of behavioral disclosure. It only reveals the sort order, but omits other important behaviors such as pagination, authentication requirements, or whether the list includes all sites. The core behavior of returning a list is already implied by the tool name.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.