Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given that an output schema exists (so return values need no explanation), the description is complete: it covers purpose, usage (polling), behavior (non-blocking, expiration), status semantics, and authentication requirements. It leaves no critical gaps for the agent to function correctly.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.