Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema coverage is 100%, so the baseline is 3 and the schema already documents keyword, page_token and content_type in depth. The description adds meaning the schema does not: content_type semantics as a filter, the non-post result filtering, and the instruction to reuse share_url/post_id when continuing from results, which guides downstream calls.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.