Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 0%, so the description must compensate. It provides the comma-separated format for the 'ids' parameter, which is not in the schema. However, it does not explain 'client_key' or 'media_filter', leaving these parameters without additional semantics. Partial compensation, hence a 3.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.