Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 100% and one parameter carries an enum, so the schema fully documents type, contact, message, and endpoint. The description's only nod to parameters is the vague phrase 'in a structured way', which adds no detail beyond the schema. Baseline 3 is appropriate.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.