Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the tool has 2 parameters with 0% schema coverage but an output schema exists, the description compensates somewhat by documenting parameters. However, for a tool with no annotations, it lacks behavioral context like safety, permissions, or error handling, making it minimally adequate but with clear gaps.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.