Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The readOnlyHint and destructiveHint annotations already establish safety, and the description adds useful behavioral detail by naming the possible statuses (PENDING, RUNNING, COMPLETED, FAILED) and mentioning progress steps and error reporting. This goes beyond the annotation-only view without contradicting it.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.