Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a simple 2-parameter read-only test tool, the description covers purpose, output, engine, and lack of interaction count. However, the history parameter is not explained, and with no output schema the description is the only source for return expectations beyond the brief 'text answer' phrase, making it slightly incomplete.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.