ai-agents-for-beginners

🌍 AI 旅遊代理人使用 Microsoft Agent Framework (.NET)

📋 情境概述

此筆記本展示如何使用 Microsoft Agent Framework for .NET 建立一個智能旅遊規劃代理人。該代理人能自動生成個性化的全球隨機目的地一日遊行程。

主要功能：

• 🎲 隨機目的地選擇：使用自定義工具挑選度假地點
• 🗺️ 智能行程規劃：創建詳細的每日行程
• 🔄 即時串流：支持即時和串流回應
• 🛠️ 自定義工具整合：展示如何擴展代理人功能

🔧 技術架構

核心技術

• Microsoft Agent Framework：最新的 .NET 實現，用於開發 AI 代理人
• GitHub Models 整合：使用 GitHub 的 AI 模型推理服務
• OpenAI API 兼容性：利用 OpenAI 客戶端庫和自定義端點
• 安全配置：基於環境的 API 密鑰管理

主要組件

1. AIAgent：主要代理人協調器，負責處理對話流程
2. 自定義工具：代理人可使用的 GetRandomDestination() 函數
3. 聊天客戶端：基於 GitHub Models 的對話介面
4. 串流支持：即時回應生成功能

整合模式

graph LR
    A[User Request] --> B[AI Agent]
    B --> C[GitHub Models API]
    B --> D[GetRandomDestination Tool]
    C --> E[Travel Itinerary]
    D --> E

🚀 快速入門

先決條件

• .NET 10 SDK 或更高版本
• GitHub Models API 訪問令牌

所需環境變數

# zsh/bash
export GH_TOKEN=<your_github_token>
export GH_ENDPOINT=https://models.github.ai/inference
export GH_MODEL_ID=openai/gpt-5-mini

# PowerShell
$env:GH_TOKEN = "<your_github_token>"
$env:GH_ENDPOINT = "https://models.github.ai/inference"
$env:GH_MODEL_ID = "openai/gpt-5-mini"

範例代碼

要運行代碼範例，

# zsh/bash
chmod +x ./01-dotnet-agent-framework.cs
./01-dotnet-agent-framework.cs

或者使用 dotnet CLI：

dotnet run ./01-dotnet-agent-framework.cs

請參閱 01-dotnet-agent-framework.cs 以獲取完整代碼。

#!/usr/bin/dotnet run

#:package Microsoft.Extensions.AI@9.*
#:package Microsoft.Agents.AI.OpenAI@1.*-*

using System.ClientModel;
using System.ComponentModel;

using Microsoft.Agents.AI;
using Microsoft.Extensions.AI;

using OpenAI;

// Tool Function: Random Destination Generator
// This static method will be available to the agent as a callable tool
// The [Description] attribute helps the AI understand when to use this function
// This demonstrates how to create custom tools for AI agents
[Description("Provides a random vacation destination.")]
static string GetRandomDestination()
{
    // List of popular vacation destinations around the world
    // The agent will randomly select from these options
    var destinations = new List<string>
    {
        "Paris, France",
        "Tokyo, Japan",
        "New York City, USA",
        "Sydney, Australia",
        "Rome, Italy",
        "Barcelona, Spain",
        "Cape Town, South Africa",
        "Rio de Janeiro, Brazil",
        "Bangkok, Thailand",
        "Vancouver, Canada"
    };

    // Generate random index and return selected destination
    // Uses System.Random for simple random selection
    var random = new Random();
    int index = random.Next(destinations.Count);
    return destinations[index];
}

// Extract configuration from environment variables
// Retrieve the GitHub Models API endpoint, defaults to https://models.github.ai/inference if not specified
// Retrieve the model ID, defaults to openai/gpt-5-mini if not specified
// Retrieve the GitHub token for authentication, throws exception if not specified
var github_endpoint = Environment.GetEnvironmentVariable("GH_ENDPOINT") ?? "https://models.github.ai/inference";
var github_model_id = Environment.GetEnvironmentVariable("GH_MODEL_ID") ?? "openai/gpt-5-mini";
var github_token = Environment.GetEnvironmentVariable("GH_TOKEN") ?? throw new InvalidOperationException("GH_TOKEN is not set.");

// Configure OpenAI Client Options
// Create configuration options to point to GitHub Models endpoint
// This redirects OpenAI client calls to GitHub's model inference service
var openAIOptions = new OpenAIClientOptions()
{
    Endpoint = new Uri(github_endpoint)
};

// Initialize OpenAI Client with GitHub Models Configuration
// Create OpenAI client using GitHub token for authentication
// Configure it to use GitHub Models endpoint instead of OpenAI directly
var openAIClient = new OpenAIClient(new ApiKeyCredential(github_token), openAIOptions);

// Create AI Agent with Travel Planning Capabilities
// Initialize OpenAI client, get chat client for specified model, and create AI agent
// Configure agent with travel planning instructions and random destination tool
// The agent can now plan trips using the GetRandomDestination function
AIAgent agent = openAIClient
    .GetChatClient(github_model_id)
    .CreateAIAgent(
        instructions: "You are a helpful AI Agent that can help plan vacations for customers at random destinations",
        tools: [AIFunctionFactory.Create(GetRandomDestination)]
    );

// Execute Agent: Plan a Day Trip
// Run the agent with streaming enabled for real-time response display
// Shows the agent's thinking and response as it generates the content
// Provides better user experience with immediate feedback
await foreach (var update in agent.RunStreamingAsync("Plan me a day trip"))
{
    await Task.Delay(10);
    Console.Write(update);
}

---

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