{
    "action": "tool_call",
    "reasoning": "My previous reply had no valid JSON and its numbers aren't backed by evidence I can see. Re-run the surface segmentation query so the numbers are grounded and rendered.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT Surface, COUNT(*) AS n_rows, AVG(TRY_CAST(Aces AS DOUBLE)) AS avg_aces, AVG(TRY_CAST(DFs AS DOUBLE)) AS avg_dfs, AVG(TRY_CAST(Rk AS DOUBLE)) AS avg_rank FROM raw.raw_kaggle GROUP BY Surface ORDER BY n_rows DESC",
        "purpose": "Profile surface as the primary segmentation: row counts, average aces, double faults, and player rank per surface",
        "source": "raw"
    }
}