Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema coverage is 100%: all 5 parameters (limit, scene, categoryId, isRecommended, titleContains) have descriptions and defaults/limits. The description does not add parameter-level meaning beyond what the schema already provides, so the baseline 3 applies.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.