.Net: Update Anthropic and Anthropic.Foundry package versions (#3517)

* Initial plan

* Update Anthropic packages to v12.3.0 and Anthropic.Foundry to v0.4.1

Co-authored-by: rogerbarreto <19890735+rogerbarreto@users.noreply.github.com>

* Fix AnthropicClient not being disposed in sample

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: rogerbarreto <19890735+rogerbarreto@users.noreply.github.com>

dotnet/samples/GettingStarted/AgentProviders/Agent_With_Anthropic/Program.cs

@@ -2,15 +2,12 @@
 
 // This sample shows how to create and use an AI agent with Anthropic as the backend.
 
-using System.Net.Http.Headers;
 using Anthropic;
 using Anthropic.Foundry;
-using Azure.Core;
 using Azure.Identity;
 using Microsoft.Agents.AI;
-using Sample;
 
-var deploymentName = Environment.GetEnvironmentVariable("ANTHROPIC_DEPLOYMENT_NAME") ?? "claude-haiku-4-5";
+string deploymentName = Environment.GetEnvironmentVariable("ANTHROPIC_DEPLOYMENT_NAME") ?? "claude-haiku-4-5";
 
 // The resource is the subdomain name / first name coming before '.services.ai.azure.com' in the endpoint Uri
 // ie: https://(resource name).services.ai.azure.com/anthropic/v1/chat/completions
@@ -20,55 +17,13 @@ string? apiKey = Environment.GetEnvironmentVariable("ANTHROPIC_API_KEY");
 const string JokerInstructions = "You are good at telling jokes.";
 const string JokerName = "JokerAgent";
 
-AnthropicClient? client = (resource is null)
-    ? new AnthropicClient() { APIKey = apiKey ?? throw new InvalidOperationException("ANTHROPIC_API_KEY is required when no ANTHROPIC_RESOURCE is provided") }  // If no resource is provided, use Anthropic public API
+using AnthropicClient client = (resource is null)
+    ? new AnthropicClient() { ApiKey = apiKey ?? throw new InvalidOperationException("ANTHROPIC_API_KEY is required when no ANTHROPIC_RESOURCE is provided") }  // If no resource is provided, use Anthropic public API
     : (apiKey is not null)
         ? new AnthropicFoundryClient(new AnthropicFoundryApiKeyCredentials(apiKey, resource)) // If an apiKey is provided, use Foundry with ApiKey authentication
-        : new AnthropicFoundryClient(new AnthropicAzureTokenCredential(new AzureCliCredential(), resource)); // Otherwise, use Foundry with Azure Client authentication
+        : new AnthropicFoundryClient(new AnthropicFoundryIdentityTokenCredentials(new AzureCliCredential(), resource, ["https://ai.azure.com/.default"])); // Otherwise, use Foundry with Azure TokenCredential authentication
 
 AIAgent agent = client.AsAIAgent(model: deploymentName, instructions: JokerInstructions, name: JokerName);
 
 // Invoke the agent and output the text result.
 Console.WriteLine(await agent.RunAsync("Tell me a joke about a pirate."));
-
-namespace Sample
-{
-    /// <summary>
-    /// Provides methods for invoking the Azure hosted Anthropic models using <see cref="TokenCredential"/> types.
-    /// </summary>
-    public sealed class AnthropicAzureTokenCredential : IAnthropicFoundryCredentials
-    {
-        private readonly TokenCredential _tokenCredential;
-        private readonly Lock _lock = new();
-        private AccessToken? _cachedAccessToken;
-
-        /// <inheritdoc/>
-        public string ResourceName { get; }
-
-        /// <summary>
-        /// Creates a new instance of the <see cref="AnthropicAzureTokenCredential"/>.
-        /// </summary>
-        /// <param name="tokenCredential">The credential provider. Use any specialization of <see cref="TokenCredential"/> to get your access token in supported environments.</param>
-        /// <param name="resourceName">The service resource subdomain name to use in the anthropic azure endpoint</param>
-        internal AnthropicAzureTokenCredential(TokenCredential tokenCredential, string resourceName)
-        {
-            this.ResourceName = resourceName ?? throw new ArgumentNullException(nameof(resourceName));
-            this._tokenCredential = tokenCredential ?? throw new ArgumentNullException(nameof(tokenCredential));
-        }
-
-        /// <inheritdoc/>
-        public void Apply(HttpRequestMessage requestMessage)
-        {
-            lock (this._lock)
-            {
-                // Add a 5-minute buffer to avoid using tokens that are about to expire
-                if (this._cachedAccessToken is null || this._cachedAccessToken.Value.ExpiresOn <= DateTimeOffset.Now.AddMinutes(5))
-                {
-                    this._cachedAccessToken = this._tokenCredential.GetToken(new TokenRequestContext(scopes: ["https://ai.azure.com/.default"]), CancellationToken.None);
-                }
-            }
-
-            requestMessage.Headers.Authorization = new AuthenticationHeaderValue("bearer", this._cachedAccessToken.Value.Token);
-        }
-    }
-}

dotnet/samples/GettingStarted/AgentWithAnthropic/Agent_Anthropic_Step01_Running/Program.cs

@@ -10,7 +10,7 @@ using Microsoft.Extensions.AI;
 var apiKey = Environment.GetEnvironmentVariable("ANTHROPIC_API_KEY") ?? throw new InvalidOperationException("ANTHROPIC_API_KEY is not set.");
 var model = Environment.GetEnvironmentVariable("ANTHROPIC_MODEL") ?? "claude-haiku-4-5";
 
-AIAgent agent = new AnthropicClient(new ClientOptions { APIKey = apiKey })
+AIAgent agent = new AnthropicClient(new ClientOptions { ApiKey = apiKey })
     .AsAIAgent(model: model, instructions: "You are good at telling jokes.", name: "Joker");
 
 // Invoke the agent and output the text result.

dotnet/samples/GettingStarted/AgentWithAnthropic/Agent_Anthropic_Step02_Reasoning/Program.cs

@@ -13,7 +13,7 @@ var model = Environment.GetEnvironmentVariable("ANTHROPIC_MODEL") ?? "claude-hai
 var maxTokens = 4096;
 var thinkingTokens = 2048;
 
-var agent = new AnthropicClient(new ClientOptions { APIKey = apiKey })
+var agent = new AnthropicClient(new ClientOptions { ApiKey = apiKey })
     .AsAIAgent(
         model: model,
         clientFactory: (chatClient) => chatClient

dotnet/samples/GettingStarted/AgentWithAnthropic/Agent_Anthropic_Step03_UsingFunctionTools/Program.cs

@@ -22,7 +22,7 @@ const string AssistantName = "WeatherAssistant";
 AITool tool = AIFunctionFactory.Create(GetWeather);
 
 // Get anthropic client to create agents.
-AIAgent agent = new AnthropicClient { APIKey = apiKey }
+AIAgent agent = new AnthropicClient { ApiKey = apiKey }
     .AsAIAgent(model: model, instructions: AssistantInstructions, name: AssistantName, tools: [tool]);
 
 // Non-streaming agent interaction with function tools.

dotnet/samples/GettingStarted/Workflows/_Foundational/05_MultiModelService/Program.cs

@@ -16,7 +16,7 @@ IChatClient aws = new AmazonBedrockRuntimeClient(
     .AsIChatClient("amazon.nova-pro-v1:0");
 
 IChatClient anthropic = new Anthropic.AnthropicClient(
-    new() { APIKey = Environment.GetEnvironmentVariable("ANTHROPIC_APIKEY") })
+    new() { ApiKey = Environment.GetEnvironmentVariable("ANTHROPIC_APIKEY") })
     .AsIChatClient("claude-sonnet-4-20250514");
 
 IChatClient openai = new OpenAI.OpenAIClient(