Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
There is a single parameter with 100% schema coverage and an enumeration of accepted identifier types (name, CIF/NIF, EU VAT, LEI) already in the schema. The description adds no format hints, normalization rules, or disambiguation guidance, so the baseline 3 applies.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.