Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 100%, so all seven parameters are fully documented in the schema. The description adds no parameter-specific meaning; it only reiterates that q is required, which is already in the schema. The untrusted-data note applies to results, not parameters. At baseline, the description does not need to compensate, so a 3 is appropriate.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.