Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description must carry the full burden of behavioral disclosure. It only states that it closes a poll and returns results, but omits crucial details such as: whether the poll can be reopened, what happens if the poll is already closed, whether any permissions are needed, and the exact nature of the returned results. This falls short for a state-changing operation.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.