Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false; the description adds behavioral context beyond those flags by labeling the operation as a 'Static Checker' and by disclosing the exact price, payment rail (x402), and supported networks (Base/Solana). This is useful, though it does not cover rate limits or response shape.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.