Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 100%, so per-parameter meaning is fully documented in the schema (platform URL forms, title fallback for YouTube, creator scoping, ISO language). The description adds nothing parameter-specific, but it reinforces the accepted platform set at URL level, which is slightly beyond the schema baseline.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.