Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
With no annotations, no output schema, and 0% schema description coverage, the description carries the full burden of explaining the tool. It does not explain the meaning of start and end, the export format, or what happens after the call. The definition is inadequate for an agent to invoke the tool correctly with confidence.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.