Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the behavioral disclosure burden. The verb 'List' clearly signals a non-mutating read operation, and the parenthetical defines the scope. No hidden side effects are present for a parameterless listing tool, though output shape and pagination are not described.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.