Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare openWorldHint=true, readOnlyHint=false and destructiveHint=false. The description usefully adds the 3-second polling throttle, that results are saved and merged across page batches, and that nothing is re-uploaded. It does not explain what 'readOnlyHint=false' writes or what triggers a state change, but given annotation coverage this is a reasonable addition.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.