{
    "action": "tool_call",
    "reasoning": "I need to find the time period covered by the dataset by querying the minimum and maximum values of the temporal column `_ingestion_timestamp`.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT MIN(_ingestion_timestamp) AS start_time, MAX(_ingestion_timestamp) AS end_time FROM raw.iris;",
        "purpose": "Find the time period covered by the dataset",
        "source": "raw"
    }
}