{
    "action": "tool_call",
    "reasoning": "I have no tool results in this turn to support the data-quality claims in my earlier draft, so I'm re-grounding them. One profiling query covers row count, nulls, ranges, distinct species and batch/source counts.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT COUNT(*) AS n, COUNT(sepal_length) AS sl_nn, COUNT(sepal_width) AS sw_nn, COUNT(petal_length) AS pl_nn, COUNT(petal_width) AS pw_nn, COUNT(species) AS sp_nn, COUNT(DISTINCT species) AS species_distinct, MIN(sepal_length) AS sl_min, MAX(sepal_length) AS sl_max, MIN(sepal_width) AS sw_min, MAX(sepal_width) AS sw_max, MIN(petal_length) AS pl_min, MAX(petal_length) AS pl_max, MIN(petal_width) AS pw_min, MAX(petal_width) AS pw_max, COUNT(DISTINCT _batch_id) AS batches, COUNT(DISTINCT _source_file) AS files, COUNT(DISTINCT _source_system) AS systems FROM raw.iris",
        "purpose": "Profile completeness, ranges, species cardinality and provenance for the Iris data quality check",
        "source": "raw"
    }
}