Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden. It discloses the output (ranked mispricings, probabilities, edge) and implies a read-only scan, but it does not explicitly state that no trades are placed or mention any side effects, limitations, or safety characteristics.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.