Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description must carry the behavioral disclosure burden. It discloses one behavior (filtering by symbol), but does not mention auth requirements, pagination, return format, or behavior when no symbol is passed. This is minimal context for a trading tool.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.