Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the behavioral disclosure burden. It explicitly describes the output content: field key, label, type, required, help text, and options. This is sufficient for a read-only metadata retrieval tool with no side effects. It does not mention pagination or ordering, but those are not necessary for this simple, parameterless tool.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.