Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the burden and it does state two important traits: 'INFORMATION ONLY' signals a read-only operation and the x402 note discloses pay-per-use. It omits deeper behavioral details such as data sources, freshness, auth flow, or output behavior, but the core safety and cost traits are present.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.