Streaming is fully supported for tool using for both tool only ("tool_choice" = "any") mode or mixed mode ("auto" = "any"). The format is fully compatible with OpenAI streaming.

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How to Use

Similar as the message streaming. All you need to do is to set stream=true when calling the chat completions api. This returns an object that streams the response as data-only server-sent events. To extract chunks, use the delta field instead of the message field. Specifically, the streaming mode of tool use will guarantee to have the function name return as a single chunk then streaming the arguments. (See the code example)

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Code Example

In this example, we demonstrate how to use the streaming mode for calling tools, which will trigger two functions, and how to process their responses.
python
from openai import OpenAI

client = OpenAI(
    base_url="https://app.empower.dev/api/v1",
    api_key="YOUR_API_KEY"
)

tools = [
    {
        "type": "function",
        "function": {
            "name": "get_current_weather",
            "description": "Get the current weather in a given location",
            "parameters": {
                "type": "object",
                "properties": {
                    "location": {
                        "type": "string",
                        "description": "The city and state, e.g. San Francisco, CA",
                    },
                    "unit": {"type": "string", "enum": ["celsius", "fahrenheit"]},
                },
                "required": ["location"],
            },
        },
    }
]

response = client.chat.completions.create(
    model="empower-functions",
    messages=[{"role": "user",
               "content": "What's the weather in San Francisco and Los Angles in Celsius?"}],
    temperature=0,
    tools=tools,
    tool_choice="auto",
    stream=True
)

functions = []
for chunk in response:
    if (chunk.choices[0].delta.tool_calls):
        tool_call = chunk.choices[0].delta.tool_calls[0]
        # Can use the index to differentiate different tool calls if there're more than one
        # index = tool_call.index
        function = tool_call.function
        if function.name:
            # Function name return as one single trunk
            # Optionally you can call the function here
            functions.append({
                "index": index,
                "name": function.name,
                "arguments": ""
            })
        else:
            functions[tool_call.index]['arguments'] += function.arguments

        print(functions)
Output 
[{'name': 'get_current_weather', 'arguments': ''}]
[{'name': 'get_current_weather', 'arguments': '{'}]
[{'name': 'get_current_weather', 'arguments': '{\n'}]
[{'name': 'get_current_weather', 'arguments': '{\n '}]
[{'name': 'get_current_weather', 'arguments': '{\n  "'}]
[{'name': 'get_current_weather', 'arguments': '{\n  "location'}]
[{'name': 'get_current_weather', 'arguments': '{\n  "location":'}]
[{'name': 'get_current_weather', 'arguments': '{\n  "location": "'}]
[{'name': 'get_current_weather', 'arguments': '{\n  "location": "San'}]
....
[{'name': 'get_current_weather', 'arguments': '{\n  "location": "San Francisco, CA",\n  "unit": "celsius"\n  }'}, {'name': 'get_current_weather', 'arguments': ''}]
[{'name': 'get_current_weather', 'arguments': '{\n  "location": "San Francisco, CA",\n  "unit": "celsius"\n  }'}, {'name': 'get_current_weather', 'arguments': '{'}]
[{'name': 'get_current_weather', 'arguments': '{\n  "location": "San Francisco, CA",\n  "unit": "celsius"\n  }'}, {'name': 'get_current_weather', 'arguments': '{\n'}]
[{'name': 'get_current_weather', 'arguments': '{\n  "location": "San Francisco, CA",\n  "unit": "celsius"\n  }'}, {'name': 'get_current_weather', 'arguments': '{\n '}]
[{'name': 'get_current_weather', 'arguments': '{\n  "location": "San Francisco, CA",\n  "unit": "celsius"\n  }'}, {'name': 'get_current_weather', 'arguments': '{\n  "'}]
[{'name': 'get_current_weather', 'arguments': '{\n  "location": "San Francisco, CA",\n  "unit": "celsius"\n  }'}, {'name': 'get_current_weather', 'arguments': '{\n  "location'}]
[{'name': 'get_current_weather', 'arguments': '{\n  "location": "San Francisco, CA",\n  "unit": "celsius"\n  }'}, {'name': 'get_current_weather', 'arguments': '{\n  "location": "Los Angeles, CA",\n  "unit": "celsius"\n  }'}]