Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 86%, so the schema already documents most parameters and the description does not need to compensate. It adds useful context connecting 'mark' to the upload functions and mentions material/lighting, but it does not elaborate on depth, title, motion, or background beyond the schema.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.