{
    "action": "tool_call",
    "reasoning": "No results are visible in the evidence, so I'll query the gold table iris_by_species to ground the per-species ranges and means before answering.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT * FROM iris_by_species",
        "purpose": "Per-species min/max/avg/median of all four measures to compare feature separation",
        "source": "gold"
    }
}