Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the burden of behavioral transparency. It discloses Pro tier auth requirement and lists the specific datasets returned, which adds context. However, it does not explicitly state that this is a read-only operation or address possible errors or rate limits, making it adequate but not exemplary.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.