Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema coverage is 80%, so the schema already explains ids, gap, revision and canvas_id. The description only echoes the ids/whole-board distinction ('chosen cards (or the whole board)'), adding no format or default detail beyond the schema — baseline 3.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.