Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a simple getter with one parameter and no output schema, the description is minimally sufficient. However, it omits what the returned routing value looks like (string, integer, etc.) and any related context such as possible values or exceptions, making it adequate but not comprehensive.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.