Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
The description compensates well for unitId by explaining course-wide vs unit-scoped behavior, and the schema documents intent and requestId. However, required subjectSlug and courseVariant rely mostly on name, pattern, and enum for meaning, so the low schema coverage is only partially compensated.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.