Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the output schema, annotations, and the simplicity of the two parameters, the description covers the essential invocation context: active lease, short-lived relay URL, and credential handling. It could mention how to confirm an active lease exists, but that is a minor gap.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.