{
    "action": "tool_call",
    "reasoning": "I will query a sample of rows from the dataset so the user can see exactly what a single row looks like, complementing the explanation of the dataset's grain.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT sepal_length, sepal_width, petal_length, petal_width, species FROM raw.iris LIMIT 5",
        "purpose": "Show a sample of rows to illustrate what a single row represents.",
        "source": "raw"
    }
}