Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the tool's moderate complexity (3 parameters, no annotations, but has an output schema), the description is reasonably complete. It covers the purpose, parameters, and return value. Since an output schema exists, the description doesn't need to detail return values further. However, it could improve by adding more behavioral context, such as authentication requirements or error cases, to fully compensate for the lack of annotations.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.