Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden of behavioral disclosure. It conveys a state transition and the precondition that the session must be paused, but it does not disclose side effects, failure behavior, permissions, or what happens if the session is not in a resumable state.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.