Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
The schema covers 100% of parameters with detailed descriptions, so the baseline is 3. The description's note about preferring natural names over internal IDs is already reflected in the schema descriptions, so it adds no new semantic value beyond a helpful summary of the intended usage pattern.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.