{
    "action": "tool_call",
    "reasoning": "Get column classifications across all tables in one query, since column ownership is not listed on the card.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT table_name, semantic_role, rough_kind, key_role, phys_type, COUNT(*) AS n_cols, string_agg(column_name, ', ') AS cols FROM analytics.column_overview GROUP BY table_name, semantic_role, rough_kind, key_role, phys_type ORDER BY table_name, semantic_role",
        "purpose": "Classify all 78 columns by semantic role, kind and type in one compact query",
        "source": "raw"
    }
}