Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden of behavioral disclosure. It only states 'List all DNS records' without mentioning output format, pagination, permissions, or whether the operation is read-only. The phrase 'all' hints at scope but lacks substantive behavioral context.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.