{
    "action": "tool_call",
    "reasoning": "No evidence is in hand yet, so I can't cite the figures from my earlier draft. I'll query the gold per-species summary first to ground the claims about which feature separates the species.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT * FROM iris_by_species",
        "purpose": "Per-species min/max/avg/median of each measurement to compare feature separation",
        "source": "gold"
    }
}