Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the tool has no parameters and no output schema, the description is minimally sufficient, but it lacks context such as what 'results' include (e.g., pass/fail counts, logs), whether the tool is read-only or triggers any side effects, and how it relates to the various automation test runner siblings. For a getter with zero params, this is acceptable but not thorough.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.