Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the tool has 3 parameters, no required fields, and no schema descriptions, the description is insufficient. It does not define what a 'gap receipt' is, when to use this tool, or how the parameters affect results. With an output schema present, some completeness is provided, but the description alone is not enough to guide an agent effectively, especially with many related sibling tools.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.