Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
With an output schema present, return structure need not be described, and the description covers contents, entry trigger, pagination, and a caution about acting on previews. For a no-required-param read tool this is largely complete, though it never clarifies its relationship to get_resume_context.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.