Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
With an output schema present, the description need not explain return values. Annotations cover safety, the schema covers the single parameter, and the description covers purpose, sourcing, and a key output-handling caveat. It is nearly complete, though it could note any auth or access constraints.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.