Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a read-only, single-parameter tool with annotations and a detailed description of return values, this is complete. The description mentions each question's marking_status, marks, level, feedback, and overall status, which is sufficient for an agent to understand the call and interpret results.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.