Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the burden, and it does disclose the informational nature of the call and what it returns: every field with its key, label, type, required status, help text, and options. It implies a safe read-only listing and gives no indication of side effects. It does not discuss errors or access restrictions, but for a parameterless metadata tool this is not a significant omission.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.