src/agents/models/chatcmpl_stream_handler.py [78:93]:
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                    )
                    # Start a new assistant message stream
                    assistant_item = ResponseOutputMessage(
                        id=FAKE_RESPONSES_ID,
                        content=[],
                        role="assistant",
                        type="message",
                        status="in_progress",
                    )
                    # Notify consumers of the start of a new output message + first content part
                    yield ResponseOutputItemAddedEvent(
                        item=assistant_item,
                        output_index=0,
                        type="response.output_item.added",
                    )
                    yield ResponseContentPartAddedEvent(
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src/agents/models/chatcmpl_stream_handler.py [123:138]:
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                    )
                    # Start a new assistant message if one doesn't exist yet (in-progress)
                    assistant_item = ResponseOutputMessage(
                        id=FAKE_RESPONSES_ID,
                        content=[],
                        role="assistant",
                        type="message",
                        status="in_progress",
                    )
                    # Notify downstream that assistant message + first content part are starting
                    yield ResponseOutputItemAddedEvent(
                        item=assistant_item,
                        output_index=0,
                        type="response.output_item.added",
                    )
                    yield ResponseContentPartAddedEvent(
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