Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Although schema coverage is 100%, the description adds behavioral meaning beyond the raw parameter text: it explains that visibility controls profile exposure and reputation counting, ties thesis_id to values returned by save_thesis/list_theses, and clarifies the relationship between the visibility enum and unpublish_thesis. That is more than a restatement of the schema.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.