Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations available, the description carries the disclosure burden. It makes clear this is a metadata/read operation returning field definitions, and it establishes that the returned keys are the contract for submit_enquiry. It does not explicitly declare read-only behavior, but the zero-parameter, descriptive nature reduces the risk of misuse.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.