Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema coverage is 100%, so the schema already documents all parameters with descriptions. The description does not add extra parameter-level meaning beyond generic framing like 'named mode' and 'chapter', matching the schema's loop_slug, node, and mode_slug. Baseline of 3 is appropriate.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.