Revert "Merge from main"

This reverts commit b8206a85d7.

dotnet/samples/GettingStarted/Agents/Agent_Step03.1_UsingFunctionTools/Program.cs

@@ -0,0 +1,34 @@
+// 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.ComponentModel;
+using Azure.AI.OpenAI;
+using Azure.Identity;
+using Microsoft.Agents.AI;
+using Microsoft.Extensions.AI;
+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);
+}