Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The description adds important behavioral context beyond the annotations: 'This submits a real enquiry' signals that the tool has a real-world side effect, and the consent warning reinforces non-idempotency. Annotations already mark readOnlyHint as false and idempotentHint as false, so the description usefully supplements them rather than repeating them.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.