Implementation:Openai Openai python Response MCP Call Completed

Knowledge Sources	Openai_Openai_python OpenAI API Reference
Domains	API_Types, Responses_API
Last Updated	2026-02-15 00:00 GMT

Overview

Concrete streaming event type for signaling that an MCP tool call has completed successfully provided by the openai-python SDK.

Description

ResponseMcpCallCompletedEvent is a Pydantic model emitted when an MCP tool call has completed successfully. It carries the item_id identifying the MCP tool call item that completed, the output_index indicating which output item completed, and a sequence_number for event ordering. The type field is always "response.mcp_call.completed".

Usage

Import this type when building streaming event handlers that need to detect successful completion of MCP tool calls, for example to trigger downstream processing of the tool call result.

Code Reference

Source Location

• Repository: openai-python
• File: src/openai/types/responses/response_mcp_call_completed_event.py

Signature

class ResponseMcpCallCompletedEvent(BaseModel):
    """Emitted when an MCP tool call has completed successfully."""

    item_id: str
    output_index: int
    sequence_number: int
    type: Literal["response.mcp_call.completed"]

Import

from openai.types.responses import ResponseMcpCallCompletedEvent

I/O Contract

Fields

Name	Type	Required	Description
item_id	str	Yes	The ID of the MCP tool call item that completed.
output_index	int	Yes	The index of the output item that completed.
sequence_number	int	Yes	The sequence number of this event.
type	Literal["response.mcp_call.completed"]	Yes	The type of the event. Always response.mcp_call.completed.

Usage Examples

import openai

client = openai.OpenAI()

stream = client.responses.create(
    model="gpt-4o",
    input="Use the MCP tool to fetch data.",
    stream=True,
)

for event in stream:
    if event.type == "response.mcp_call.completed":
        print(f"MCP call completed: item {event.item_id} "
              f"at output index {event.output_index}")

Related Pages

• Environment:Openai_Openai_python_Python_3_9_Plus