Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 100%, with creator and periodDays both fully documented in the schema, so the baseline is 3. The description's 'over a period, per platform' loosely gestures at periodDays but says nothing about creator scoping or the 'default' sentinel, adding little beyond the schema.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.