{
    "action": "tool_call",
    "reasoning": "No evidence yet. A representative sample should cover all three species, so I'll pull a few rows per species from raw.iris, chosen at random within each species.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT sepal_length, sepal_width, petal_length, petal_width, species FROM (SELECT *, ROW_NUMBER() OVER (PARTITION BY species ORDER BY random()) AS rn FROM raw.iris) WHERE rn <= 5 ORDER BY species, rn",
        "purpose": "Stratified random sample: 5 rows per species from raw.iris",
        "source": "raw"
    }
}