Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The description discloses the cost ($0.001 USDC via x402), which is a useful operational trait. However, with no annotations, it fails to describe conversion behavior, input handling, return format, or side effects. The description carries the full burden but provides minimal behavioral insight.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.