Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the tool's simplicity, no output schema (but description provides return format), and sibling tools that might overlap, the description is complete. It covers the tool's function, parameters, return structure, and a concrete example, ensuring an agent can invoke it correctly.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.