Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
With a single well-documented parameter and an output schema present, the description sufficiently covers purpose, usage, authentication, and data trust. It provides everything an agent needs to decide when to call the tool and what to expect, without needing to explain return values that the output schema already handles.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.