Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint and idempotentHint, and the description adds meaningful behavioral details beyond those: polling cadence, terminal status values, and the presence of execution_id or dataset_id in the completed response. This informs the agent what to expect and how to proceed without contradicting the annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.