Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 100%, so the schema already documents matching semantics (exact ID, case-insensitive substring, type examples like GENERIC/FBA/ECCANGWMS). The description merely restates the three parameter names and adds nothing beyond them, so the baseline 3 applies.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.