Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden, and it adequately conveys that this is an informational/read-only tool returning field metadata rather than performing an action. It also clarifies that answers belong in submit_enquiry, reducing the risk of misuse. It does not mention potential side effects, but none are implied or plausible for a field-listing tool.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.