Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given 3 parameters with a nested object, no output schema, and no description coverage, the description is incomplete. It does not explain how the tool behaves (e.g., what happens on success/failure, whether it returns anything, how multiple operations are handled).
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.