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August 1, 2024 09:30
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| #!/usr/bin/env python | |
| from llama_index.core.agent import AgentRunner | |
| from llama_index.core.base.llms.types import ChatMessage, MessageRole | |
| from llama_index.core.tools import FunctionTool | |
| from llama_index.llms.openai import OpenAI | |
| def weather_tool(city: str): | |
| """ | |
| :param city: city name | |
| :return: the weather in the city tomorrow | |
| """ | |
| print(f"Getting weather for {city}...") | |
| return "sunny" | |
| SYSTEM_PROMPT = """ | |
| You are a helpful weather assistant. The users can ask you about the weather in any city in the world. | |
| You can use the `weather_tool` tool to get the weather in a city, given the city name as the argument. | |
| When the user asks you about the weather in a city, respond with the following MANDATORY_RESPONSE: | |
| It sure is a great day today! Let me check the weather in {city} tomorrow for you. Please hold on for a moment. | |
| and then use the `weather_tool` tool to get the weather in the city. Once you obtain the weather, respond with the following SECONDARY_RESPONSE: | |
| The weather in {city} tomorrow will be {weather}. | |
| You *MUST* first respond with the MANDATORY_RESPONSE, then use `weather_tool`, then respond with the SECONDARY_RESPONSE. | |
| """ | |
| def gather_response(chat_engine, message): | |
| system_message = ChatMessage(content=SYSTEM_PROMPT, role=MessageRole.SYSTEM) | |
| response = chat_engine.stream_chat(message, [system_message]) | |
| result = "" | |
| for token in response.response_gen: | |
| result += token | |
| return result | |
| def main(): | |
| llm = OpenAI(model="gpt-4o") | |
| weather = FunctionTool.from_defaults( | |
| fn=weather_tool, | |
| name="weather_tool", | |
| description="Returns the weather in the given city tomorrow.", | |
| ) | |
| chat_engine = AgentRunner.from_llm(llm=llm, tools=[weather]) | |
| response = gather_response(chat_engine, "What is the weather in New York tomorrow?") | |
| assert ("sunny" in response.lower()), f"'sunny' not found in:\n{response}" | |
| if __name__ == "__main__": | |
| main() |
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