Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema coverage is 100%, so the baseline is 3. The description adds meaningful semantic detail for the `format` parameter—markdown returns rendered body, json returns structured payload, preview returns abstract-only—which is more than the schema's terse 'Response shape' description. The `report_id` parameter gains no additional meaning beyond the schema, but the format elaboration justifies a 4.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.