Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 100%, with the single parameter 'days' fully documented in the schema (type, description, constraints, default). The description adds no additional parameter semantics beyond what the schema provides, so the baseline score of 3 is appropriate given the schema does all the work.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.