Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the simple two-parameter tool, full schema coverage, output schema presence, and read-only annotations, the description covers everything an agent needs: what is returned, why the identifiers matter, and how to use both parameters. There are no meaningful gaps for this tool's complexity.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.