Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema coverage is 100%, and both the enum values and the description are fully documented in the schema, so the description adds no parameter detail beyond it. It does clarify the meaning of the id as 'the prefix before the first underscore', which is marginal added value. Baseline 3 applies.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.