Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a simple read-only list tool with strong annotations, the description plus schema is minimally viable: the agent knows the operation is safe, account-scoped, and filterable. However, with no output schema and no parameter explanations, the description leaves gaps around return shape, pagination behavior, and how filter parameters combine, so it is not fully complete.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.