Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 100%, so the schema already documents all 9 parameters including enum values and defaults (limit, platform, format, stockType, marketType, detailLevel, etc.). The description largely restates the platform aliases already present in the schema and adds no syntax or format guidance beyond it, so the baseline of 3 applies.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.