MonteWalk

Instructions

Cancels a specific open order.

Args:
    order_id: The Alpaca order ID to cancel
    
Returns:
    Confirmation message

Implementation Reference

• tools/execution.py:140-160 (handler)

  Main MCP tool handler: cancels order via broker and returns user-friendly status message.

  def cancel_order(order_id: str) -> str:
      """
      Cancels a specific open order.
      
      Args:
          order_id: The Alpaca order ID to cancel
          
      Returns:
          Confirmation message
      """
      if broker is None:
          return "ERROR: Alpaca broker not initialized."
      
      try:
          logger.info(f"Cancelling order: {order_id}")
          broker.cancel_order(order_id)
          logger.info(f"Order {order_id} cancelled successfully")
          return f"✅ Order {order_id} cancelled successfully"
      except Exception as e:
          logger.error(f"Cancel order failed: {e}", exc_info=True)
          return f"ERROR: Failed to cancel order - {str(e)}"

• tools/alpaca_broker.py:259-275 (helper)

  Broker class method that performs the actual API call to cancel_order_by_id on Alpaca TradingClient.

  def cancel_order(self, order_id: str) -> bool:
      """
      Cancel a pending order.
      
      Args:
          order_id: Order ID to cancel
          
      Returns:
          True if successful
      """
      try:
          self.trading_client.cancel_order_by_id(order_id)
          logger.info(f"Order {order_id} cancelled")
          return True
      except Exception as e:
          logger.error(f"Failed to cancel order {order_id}: {e}")
          raise

• server.py:375-378 (registration)

  Registration of cancel_order (and related execution tools) as MCP tools via register_tools helper.

  register_tools(
      [place_order, cancel_order, get_positions, flatten, get_order_history],
      "Execution"
  )

• app.py:288-288 (registration)

  Tool grouping/listing in Gradio app's tools_map for UI toolbox (MCP server also enabled).

  "Execution": [place_order, cancel_order, get_positions, flatten, get_order_history],