Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a simple two-parameter, no-required-fields tool, the description plus fully documented schema is mostly enough to invoke the tool. However, without an output schema and without any note about return shape, ordering, or the difference from search_pages, the description leaves some gaps for an agent deciding how to interpret the result.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.