Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
With 0% schema description coverage, the description compensates by mapping most parameters: q (keyword search), where/select/group_by/order_by (ODSQL clauses), limit/offset (pagination), and projection (select). It misses dataset_id and instance, but these are self-evident or niche; overall it gives significant semantic meaning to 7 of 9 params.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.