Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the tool's simplicity (one parameter, no output schema, no nested objects), the description is minimally viable but lacks context such as return format, error behavior, or usage nuance. It does not go beyond the bare statement of function, so it is complete enough for a trivial getter but not richly informative.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.