Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 100%, with the param 'data' described as 'The full Kopern agent export JSON (from kopern_export_agent)'. The description adds little beyond what the schema already provides, merely restating 'Kopern export JSON'. Since the schema fully documents the parameter, the baseline of 3 is appropriate.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.