Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
With an output schema available and readOnlyHint annotation present, the description does not need to detail return values. It conveys the tool's scope, a key data transformation, and the absence of interpretive help. Minor gaps, like defining 'direction' and 'breakdowns', are acceptable given the output schema.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.