{
    "action": "tool_call",
    "reasoning": "My earlier prose answer cited catalog results I can't see in the evidence, so I won't repeat those numbers. I'll query the catalog metadata for the columns classified as categorical and use the executed result.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT table_name, column_name, phys_type, rough_kind, semantic_role, distinct_count, approx_distinct_count, null_count FROM analytics.column_overview WHERE rough_kind = 'categorical' ORDER BY COALESCE(distinct_count, approx_distinct_count), table_name, column_name",
        "purpose": "List categorical columns with their distinct counts and types from catalog metadata",
        "source": "raw"
    }
}