Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
The tool has zero parameters and the schema is effectively empty, so there are no parameter semantics for the description to clarify. The description compensates by explaining what the output means, which helps an agent interpret the returned rank, percentile, and distribution. This meets the baseline for a no-parameter tool.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.