{
    "action": "tool_call",
    "reasoning": "No evidence is shown for this turn, so I can't rely on my earlier draft. I'll pull the column profile to ground the answer on which columns are identifiers, dimensions, metrics and dates.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT column_name, phys_type, semantic_role, rough_kind, null_count, distinct_count, uniqueness_score, min_value, max_value, aggregation_role, key_role FROM analytics.column_overview WHERE table_name = 'iris' ORDER BY column_name",
        "purpose": "Profile every column of raw.iris to classify identifiers, dimensions, metrics and date/time columns",
        "source": "raw"
    }
}