Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the transparency burden. It discloses that the tool is free, returns evidence and confidence scores rather than advice, and leaves the transaction decision to the user. This is meaningful behavioral context beyond the schema, though it does not cover operational details like rate limits or pagination.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.