Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
The description explains the mask semantics (white pixels = foreground, black pixels = background) and mentions inputting a photo, which partially compensates for the missing description on the 'request' parameter (schema coverage 50%). However, it does not cover the polling parameter or the option to use file IDs instead of URLs, leaving some gaps.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.