Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the burden but is mostly a structural description of the output. It does convey that this is a read-only metadata tool and implies no side effects, but it does not mention whether the field values or options are localized, whether the schema corresponds to a specific step, or what happens for conditional fields.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.