{
    "action": "tool_call",
    "reasoning": "No evidence is in context, so I can't cite the profiling numbers from my earlier draft. I'll pull the column metadata for raw.iris, including the underscore-prefixed columns, before classifying them.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT column_name, phys_type, semantic_role, rough_kind, aggregation_role, key_role, null_count, distinct_count, uniqueness_score, min_value, max_value FROM analytics.column_overview WHERE table_name = 'iris' ORDER BY column_name",
        "purpose": "Classify columns as identifiers, dimensions, metrics, or date/time using profiling metadata, including the underscore columns",
        "source": "raw"
    }
}