Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnly/destructive/openWorld, but the description goes well beyond them: the status lifecycle (queued, succeeded, failed), what succeeded means per job type, the interpreting fields, and the error behavior (not_found for unknown or another agent's jobId). This is rich behavioral context that annotations cannot convey.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.