Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With empty annotations, the description must fully convey behavior. It discloses that deeper hops require payment and that a free preview exists, but does not cover other aspects like rate limits, permissions, or potential errors. The behavioral context is adequate but not thorough.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.