src/smolagents/models.py [1443:1471]:
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                self._last_input_token_count = event.usage.prompt_tokens
                self._last_output_token_count = event.usage.completion_tokens
                yield ChatMessageStreamDelta(
                    content="",
                    token_usage=TokenUsage(
                        input_tokens=event.usage.prompt_tokens,
                        output_tokens=event.usage.completion_tokens,
                    ),
                )
            if event.choices:
                choice = event.choices[0]
                if choice.delta:
                    yield ChatMessageStreamDelta(
                        content=choice.delta.content,
                        tool_calls=[
                            ChatMessageToolCallStreamDelta(
                                index=delta.index,
                                id=delta.id,
                                type=delta.type,
                                function=delta.function,
                            )
                            for delta in choice.delta.tool_calls
                        ]
                        if choice.delta.tool_calls
                        else None,
                    )
                else:
                    if not getattr(choice, "finish_reason", None):
                        raise ValueError(f"No content or tool calls in event: {event}")
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src/smolagents/models.py [1557:1585]:
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                self._last_input_token_count = event.usage.prompt_tokens
                self._last_output_token_count = event.usage.completion_tokens
                yield ChatMessageStreamDelta(
                    content="",
                    token_usage=TokenUsage(
                        input_tokens=event.usage.prompt_tokens,
                        output_tokens=event.usage.completion_tokens,
                    ),
                )
            if event.choices:
                choice = event.choices[0]
                if choice.delta:
                    yield ChatMessageStreamDelta(
                        content=choice.delta.content,
                        tool_calls=[
                            ChatMessageToolCallStreamDelta(
                                index=delta.index,
                                id=delta.id,
                                type=delta.type,
                                function=delta.function,
                            )
                            for delta in choice.delta.tool_calls
                        ]
                        if choice.delta.tool_calls
                        else None,
                    )
                else:
                    if not getattr(choice, "finish_reason", None):
                        raise ValueError(f"No content or tool calls in event: {event}")
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