Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 100% for the single 'input' parameter, which is documented as 'object fields to be created (e.g. name, content)'. The description adds no extra semantics beyond the schema, so the baseline 3 applies. It does clarify it accepts an object, but that is already in schema.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.