Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Without annotations, the description carries the full burden of behavioral disclosure. It tells what the tool returns (recently-listed markets) but does not disclose important traits such as whether results are combined across venues, how 'recently' is defined, ordering, pagination, authentication needs, or any limitations. This is a significant gap for a retrieval tool.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.