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 reveals that the tool is non-blocking and returns a state or final result, but it does not explain poll behavior, what happens before completion, possible states, error behavior, or whether the result is one-time or repeatable.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.