Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden and does a reasonable job: it enumerates the returned field attributes and implies a read-only introspection tool by directing answer-passing to submit_enquiry. It does not explicitly state that the tool has no side effects, but nothing in the wording suggests mutation, and the sibling reference clarifies its role.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.