Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema coverage is 33%, so the description must compensate, and it does: it explains the {answer, sources:[{source_id,text}]} shape, the empty-array preflight mode, and the citation/quote placement rule. numeric_smoke_check is clarified as literal number-token comparison only, not unit or meaning checks, which meaningfully extends the schema description.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.