Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations at all, the description carries the full burden, and it does add one genuinely valuable behavioral fact: human review is still required, so the agent should not treat the export as a final approved artifact. It omits other important traits such as where files are written, whether the export is repeatable/overwriting, and required permissions.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.