{
    "action": "tool_call",
    "reasoning": "I need to find if there are any temporal columns (dates, years) to determine the time period covered by the dataset.",
    "tool": "query_sql",
    "args": {
        "purpose": "Find temporal columns to determine time period",
        "source": "raw",
        "sql": "SELECT table_name, column_name, phys_type, semantic_role, min_value, max_value FROM analytics.column_overview WHERE semantic_role = 'datetime' OR column_name ILIKE '%date%' OR column_name ILIKE '%year%' OR column_name ILIKE '%time%';"
    }
}