{
    "action": "tool_call",
    "reasoning": "Confirm row count and the range of the only temporal field (ingestion timestamp), plus batch and source file counts, to ground what the dataset can and cannot say about time.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT COUNT(*) AS row_count, MIN(_ingestion_timestamp) AS first_ingested, MAX(_ingestion_timestamp) AS last_ingested, COUNT(DISTINCT _batch_id) AS batches, COUNT(DISTINCT _source_file) AS source_files FROM raw.Iris",
        "purpose": "Confirm row count and the only temporal field's range (ingestion timestamp)",
        "source": "raw"
    }
}