Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 100%, and each parameter has meaningful descriptions with defaults, formats, and filter semantics (e.g., date bounds, source, post_id resolution). The tool description itself adds no parameter-level meaning, so the baseline of 3 is appropriate since the schema carries the full semantic load.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.