chore: import upstream snapshot with attribution

dotnet/samples/05-end-to-end/AgentWithPurview/Program.cs

@@ -0,0 +1,46 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+// This sample shows how to create and use a simple AI agent with Purview integration.
+// It uses Azure OpenAI as the backend, but any IChatClient can be used.
+// Authentication to Purview is done using an InteractiveBrowserCredential.
+// Any TokenCredential with Purview API permissions can be used here.
+
+using Azure.AI.OpenAI;
+using Azure.Core;
+using Azure.Identity;
+using Microsoft.Agents.AI;
+using Microsoft.Agents.AI.Purview;
+using Microsoft.Extensions.AI;
+
+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-5.4-mini";
+var purviewClientAppId = Environment.GetEnvironmentVariable("PURVIEW_CLIENT_APP_ID") ?? throw new InvalidOperationException("PURVIEW_CLIENT_APP_ID is not set.");
+
+// This will get a user token for an entra app configured to call the Purview API.
+// Any TokenCredential with permissions to call the Purview API can be used here.
+TokenCredential browserCredential = new InteractiveBrowserCredential(
+    new InteractiveBrowserCredentialOptions
+    {
+        ClientId = purviewClientAppId
+    });
+
+// WARNING: DefaultAzureCredential is convenient for development but requires careful consideration in production.
+// In production, consider using a specific credential (e.g., ManagedIdentityCredential) to avoid
+// latency issues, unintended credential probing, and potential security risks from fallback mechanisms.
+using IChatClient client = new AzureOpenAIClient(
+    new Uri(endpoint),
+    new DefaultAzureCredential())
+    .GetResponsesClient()
+    .AsIChatClient(deploymentName)
+    .AsBuilder()
+    .WithPurview(browserCredential, new PurviewSettings("Agent Framework Test App"))
+    .Build();
+
+Console.WriteLine("Enter a prompt to send to the client:");
+string? promptText = Console.ReadLine();
+
+if (!string.IsNullOrEmpty(promptText))
+{
+    // Invoke the agent and output the text result.
+    Console.WriteLine(await client.GetResponseAsync(promptText));
+}