Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden. 'List' makes clear this is a read operation with no mutation, which is useful, but nothing is disclosed about response format, pagination, errors, or whether DNSSEC must already be enabled. The description is sufficient for a simple list call but lacks deeper behavioral detail.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.