Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden of behavioral disclosure. 'Return' implies a read-only operation, and 'free' indicates no payment requirement. However, it does not disclose potential limitations (e.g., how many pools, historical depth, or rate limits) or clarify what 'recent block-share windows' means operationally. It is adequate but not rich.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.