Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 100% for the top-level parameters (diagram_id, format, options), and the format parameter has an explicit enum. The description adds no additional parameter semantics, but the baseline is 3 given the high schema coverage. Nested option fields (scale, width, height, transparent) lack description, but the description does not compensate for this.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.