Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description must carry the full burden. It discloses the cost ($0.01 USDC via x402) and availability (COMING SOON – not accepting payments yet), which are valuable behavioral traits. It does not explicitly state read-only nature or describe the return format, but the core constraints 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.