Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The annotations already declare a safe read-only, idempotent, non-destructive profile, and the description goes further by disclosing that the call itself does not perform the purchase, that payment happens through an x402 client on the returned report URL, and that unmonitored endpoints return 404 and are never charged. That is genuinely non-obvious behavior beyond the annotations, though actual billing mechanics (rate limits, cost of the quote call) remain unspecified.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.