Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
The tool has zero formal parameters, and schema coverage is 100% (the schema is empty). The description does not explain how the scale value is provided (perhaps via a property or global state), but with no parameters to document, the baseline is 4. Since it adds no parameter-related semantics, a 3 is appropriate: average but not failing.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.