{
    "action": "tool_call",
    "reasoning": "No evidence is visible in this turn, so I can't rely on the numbers in my earlier draft. I'll re-check the claim against the per-surface gold table before answering.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT * FROM raw_kaggle_by_Surface",
        "purpose": "Verify per-surface average player rank (Rk) vs opponent rank (vRk) from the gold table",
        "source": "gold"
    }
}