{
    "action": "tool_call",
    "reasoning": "Species frequency is covered by the gold table iris_by_species, so I query it directly with source='gold'.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT species, row_count, ROUND(100.0 * row_count / SUM(row_count) OVER (), 1) AS pct FROM iris_by_species ORDER BY row_count DESC",
        "purpose": "Frequency of each species value",
        "source": "gold"
    }
}