agent-framework/dotnet/samples/GettingStarted/Agents/Agent_Step03_UsingFunctionTools/Program.cs

// Copyright (c) Microsoft. All rights reserved.

// This sample demonstrates how to use a ChatClientAgent with function tools.
// It shows both non-streaming and streaming agent interactions using menu-related tools.

using System;
using System.ComponentModel;
using Azure.AI.OpenAI;
using Azure.Identity;
using Microsoft.Extensions.AI;
using Microsoft.Extensions.AI.Agents;
using OpenAI;

var endpoint = Environment.GetEnvironmentVariable("AZURE_OPENAI_ENDPOINT") ?? throw new InvalidOperationException("AZURE_OPENAI_ENDPOINT is not set.");
var deploymentName = Environment.GetEnvironmentVariable("AZURE_OPENAI_DEPLOYMENT_NAME") ?? "gpt-4o-mini";

[Description("Get the weather for a given location.")]
static string GetWeather([Description("The location to get the weather for.")] string location)
    => $"The weather in {location} is cloudy with a high of 15°C.";

// Create the chat client and agent, and provide the function tool to the agent.
AIAgent agent = new AzureOpenAIClient(
    new Uri(endpoint),
    new AzureCliCredential())
     .GetChatClient(deploymentName)
     .CreateAIAgent(instructions: "You are a helpful assistant", tools: [AIFunctionFactory.Create(GetWeather)]);

// Non-streaming agent interaction with function tools.
Console.WriteLine(await agent.RunAsync("What is the weather like in Amsterdam?"));

// Streaming agent interaction with function tools.
await foreach (var update in agent.RunStreamingAsync("What is the weather like in Amsterdam?"))
{
    Console.WriteLine(update);
}