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 the main returned data (stock code, name, holding ratio) and implies a read-only operation, but it does not mention data source, report period, ordering, pagination, or limitations. This is adequate for a simple getter but not rich.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.