Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
With only two parameters, full schema coverage, an output schema, and annotations covering safety, the description supplies the remaining essentials: prerequisite API key, token source, lifetime consequences, and post-claim capabilities. Nothing needed to invoke it correctly or interpret a success is missing.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.