{
    "action": "tool_call",
    "reasoning": "My earlier draft quoted surface figures without any query result in evidence, so I'm running the surface breakdown now to ground them before answering.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT Surface, COUNT(*) AS n_rows, AVG(Aces) AS avg_aces, AVG(DFs) AS avg_dfs, AVG(TP) AS avg_tp, AVG(Rk) AS avg_rank FROM raw.raw_kaggle GROUP BY Surface ORDER BY n_rows DESC",
        "purpose": "Profile serve metrics and group sizes by surface to validate Surface as a segmentation",
        "source": "raw"
    }
}