Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a complex transaction-building tool with five parameters, the description covers operation selection, address semantics, time sensitivity, failure handling, simulation limitations, and a pre-check prerequisite. Since an output schema exists, the description does not need to explain return values. This is complete enough for an agent to call the tool correctly.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.