Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 100%, so the baseline is 3 even without parameter details in the description. The phrase 'for a campaign' reinforces that campaignId scopes the result, but the description adds no meaningful format, range, or constraint information beyond what the schema already states for this single required parameter.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.