Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a simple ID-based lookup, the description is minimally adequate. However, it lacks details on error handling, return format, or any special behavior. Given the lack of output schema and annotations, a score of 3 reflects that it is complete enough for a straightforward tool but leaves gaps.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.