Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden. It discloses that each record has a stable id and that a zone_version token is returned, which is crucial for understanding output stability and concurrency behavior. The phrase 'for a domain you own' also implies an ownership requirement, adding behavioral context beyond the schema.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.