Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 100%, so 'business' (page handle) and 'productId' (from list_catalog) are already documented in the schema. The description only gestures at 'Say which product' and adds no format, source, or constraints beyond what the schema states, which is the baseline case.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.