{
    "action": "tool_call",
    "reasoning": "I need to find temporal columns and their ranges to determine the dataset's time coverage. I'll query the column_overview metadata to identify date/timestamp columns and their min/max values.",
    "tool": "query_sql",
    "purpose": "Identify temporal columns and their date ranges across all tables",
    "args": {
        "sql": "SELECT table_name, column_name, phys_type, min_value, max_value FROM analytics.column_overview WHERE phys_type IN ('TIMESTAMP', 'DATE', 'TIMESTAMP WITH TIME ZONE') OR column_name LIKE '%_at' OR column_name LIKE '%_date' OR column_name LIKE 'date_%' ORDER BY table_name, column_name LIMIT 50",
        "source": "raw"
    }
}