{
    "action": "tool_call",
    "reasoning": "My earlier draft cited numbers without a query result behind them. I'll recompute the surface segmentation from raw.raw_kaggle so the figures are grounded.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT Surface, COUNT(*) AS n_rows, ROUND(AVG(Aces),2) AS avg_aces, ROUND(AVG(DFs),2) AS avg_double_faults, ROUND(AVG(Rk),0) AS avg_rank FROM raw.raw_kaggle GROUP BY Surface ORDER BY n_rows DESC",
        "purpose": "Profile the surface segments by size, serve stats and player rank",
        "source": "raw"
    }
}