OpenAI 响应代理

入门

将所需的 NuGet 包添加到项目。

dotnet add package Microsoft.Agents.AI.OpenAI --prerelease

创建 OpenAI 响应代理

首先需要创建客户端以连接到 OpenAI 服务。

using System;
using Microsoft.Agents.AI;
using OpenAI;

OpenAIClient client = new OpenAIClient("<your_api_key>");

OpenAI 支持多个服务，这些服务都提供模型调用功能。 我们需要选择响应服务来创建基于响应的代理。

#pragma warning disable OPENAI001 // Type is for evaluation purposes only and is subject to change or removal in future updates.
var responseClient = client.GetOpenAIResponseClient("gpt-4o-mini");
#pragma warning restore OPENAI001

最后，在 CreateAIAgent 上使用 ResponseClient 扩展方法创建代理。

AIAgent agent = responseClient.CreateAIAgent(
    instructions: "You are good at telling jokes.",
    name: "Joker");

// Invoke the agent and output the text result.
Console.WriteLine(await agent.RunAsync("Tell me a joke about a pirate."));

使用代理

代理是标准的 AIAgent，并支持所有标准 AIAgent 操作。

有关如何运行和与代理交互的详细信息，请参阅 代理入门教程 。

先决条件

安装 Microsoft Agent Framework 包。

pip install agent-framework --pre

配置

环境变量

设置 OpenAI 身份验证所需的环境变量：

# Required for OpenAI API access
OPENAI_API_KEY="your-openai-api-key"
OPENAI_RESPONSES_MODEL_ID="gpt-4o"  # or your preferred Responses-compatible model

或者，可以在项目根目录中使用 .env 文件：

OPENAI_API_KEY=your-openai-api-key
OPENAI_RESPONSES_MODEL_ID=gpt-4o

入门

从代理框架导入所需的类：

import asyncio
from agent_framework.openai import OpenAIResponsesClient

创建 OpenAI 响应代理

基本代理创建

创建响应代理的最简单方法：

async def basic_example():
    # Create an agent using OpenAI Responses
    agent = OpenAIResponsesClient().create_agent(
        name="WeatherBot",
        instructions="You are a helpful weather assistant.",
    )

    result = await agent.run("What's a good way to check the weather?")
    print(result.text)

使用显式配置

可以提供显式配置，而不是依赖于环境变量：

async def explicit_config_example():
    agent = OpenAIResponsesClient(
        ai_model_id="gpt-4o",
        api_key="your-api-key-here",
    ).create_agent(
        instructions="You are a helpful assistant.",
    )

    result = await agent.run("Tell me about AI.")
    print(result.text)

基本使用模式

流式处理响应

对即时生成的响应进行获取，以提升用户体验。

async def streaming_example():
    agent = OpenAIResponsesClient().create_agent(
        instructions="You are a creative storyteller.",
    )

    print("Assistant: ", end="", flush=True)
    async for chunk in agent.run_stream("Tell me a short story about AI."):
        if chunk.text:
            print(chunk.text, end="", flush=True)
    print()  # New line after streaming

代理功能

推理模型

对 GPT-5 等模型使用高级推理功能：

from agent_framework import HostedCodeInterpreterTool, TextContent, TextReasoningContent

async def reasoning_example():
    agent = OpenAIResponsesClient(ai_model_id="gpt-5").create_agent(
        name="MathTutor",
        instructions="You are a personal math tutor. When asked a math question, "
                    "write and run code to answer the question.",
        tools=HostedCodeInterpreterTool(),
        reasoning={"effort": "high", "summary": "detailed"},
    )

    print("Assistant: ", end="", flush=True)
    async for chunk in agent.run_stream("Solve: 3x + 11 = 14"):
        if chunk.contents:
            for content in chunk.contents:
                if isinstance(content, TextReasoningContent):
                    # Reasoning content in gray text
                    print(f"\033[97m{content.text}\033[0m", end="", flush=True)
                elif isinstance(content, TextContent):
                    print(content.text, end="", flush=True)
    print()

结构化输出

获取结构化格式的响应：

from pydantic import BaseModel
from agent_framework import AgentRunResponse

class CityInfo(BaseModel):
    """A structured output for city information."""
    city: str
    description: str

async def structured_output_example():
    agent = OpenAIResponsesClient().create_agent(
        name="CityExpert",
        instructions="You describe cities in a structured format.",
    )

    # Non-streaming structured output
    result = await agent.run("Tell me about Paris, France", response_format=CityInfo)

    if result.value:
        city_data = result.value
        print(f"City: {city_data.city}")
        print(f"Description: {city_data.description}")

    # Streaming structured output
    structured_result = await AgentRunResponse.from_agent_response_generator(
        agent.run_stream("Tell me about Tokyo, Japan", response_format=CityInfo),
        output_format_type=CityInfo,
    )

    if structured_result.value:
        tokyo_data = structured_result.value
        print(f"City: {tokyo_data.city}")
        print(f"Description: {tokyo_data.description}")

函数工具

为代理配备自定义功能：

from typing import Annotated
from pydantic import Field

def get_weather(
    location: Annotated[str, Field(description="The location to get weather for")]
) -> str:
    """Get the weather for a given location."""
    # Your weather API implementation here
    return f"The weather in {location} is sunny with 25°C."

async def tools_example():
    agent = OpenAIResponsesClient().create_agent(
        instructions="You are a helpful weather assistant.",
        tools=get_weather,
    )

    result = await agent.run("What's the weather like in Tokyo?")
    print(result.text)

图像生成

使用响应 API 生成图像：

from agent_framework import DataContent, UriContent

async def image_generation_example():
    agent = OpenAIResponsesClient().create_agent(
        instructions="You are a helpful AI that can generate images.",
        tools=[{
            "type": "image_generation",
            "size": "1024x1024",
            "quality": "low",
        }],
    )

    result = await agent.run("Generate an image of a sunset over the ocean.")

    # Check for generated images in the response
    for content in result.contents:
        if isinstance(content, (DataContent, UriContent)):
            print(f"Image generated: {content.uri}")

代码解释器

使助手能够执行 Python 代码：

from agent_framework import HostedCodeInterpreterTool

async def code_interpreter_example():
    agent = OpenAIResponsesClient().create_agent(
        instructions="You are a helpful assistant that can write and execute Python code.",
        tools=HostedCodeInterpreterTool(),
    )

    result = await agent.run("Calculate the factorial of 100 using Python code.")
    print(result.text)

使用代理

代理是标准 BaseAgent 代理，支持所有标准代理操作。

有关如何运行和与代理交互的详细信息，请参阅 代理入门教程 。