test

dotnet/samples/GettingStarted/AgentProviders/Agent_With_Anthropic/Agent_With_Anthropic.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFrameworks>net10.0</TargetFrameworks>
+
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <NoWarn>$(NoWarn);IDE0059</NoWarn>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Azure.Identity" />
+    <PackageReference Include="Anthropic.Foundry" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\..\..\src\Microsoft.Agents.AI.Anthropic\Microsoft.Agents.AI.Anthropic.csproj" />
+  </ItemGroup>
+
+</Project>

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

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+// Copyright (c) Microsoft. All rights reserved.
+
+// 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";
+
+// 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
+string? resource = Environment.GetEnvironmentVariable("ANTHROPIC_RESOURCE");
+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
+    : (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
+
+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/AgentProviders/Agent_With_Anthropic/README.md

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+# Creating an AIAgent with Anthropic
+
+This sample demonstrates how to create an AIAgent using Anthropic Claude models as the underlying inference service.
+
+The sample supports three deployment scenarios:
+
+1. **Anthropic Public API** - Direct connection to Anthropic's public API
+2. **Azure Foundry with API Key** - Anthropic models deployed through Azure Foundry using API key authentication
+3. **Azure Foundry with Azure CLI** - Anthropic models deployed through Azure Foundry using Azure CLI credentials
+
+## Prerequisites
+
+Before you begin, ensure you have the following prerequisites:
+
+- .NET 8.0 SDK or later
+
+### For Anthropic Public API
+
+- Anthropic API key
+
+Set the following environment variables:
+
+```powershell
+$env:ANTHROPIC_API_KEY="your-anthropic-api-key"  # Replace with your Anthropic API key
+$env:ANTHROPIC_DEPLOYMENT_NAME="claude-haiku-4-5"  # Optional, defaults to claude-haiku-4-5
+```
+
+### For Azure Foundry with API Key
+
+- Azure Foundry service endpoint and deployment configured
+- Anthropic API key
+
+Set the following environment variables:
+
+```powershell
+$env:ANTHROPIC_RESOURCE="your-foundry-resource-name"  # Replace with your Azure Foundry resource name (subdomain before .services.ai.azure.com)
+$env:ANTHROPIC_API_KEY="your-anthropic-api-key"  # Replace with your Anthropic API key
+$env:ANTHROPIC_DEPLOYMENT_NAME="claude-haiku-4-5"  # Optional, defaults to claude-haiku-4-5
+```
+
+### For Azure Foundry with Azure CLI
+
+- Azure Foundry service endpoint and deployment configured
+- Azure CLI installed and authenticated (for Azure credential authentication)
+
+Set the following environment variables:
+
+```powershell
+$env:ANTHROPIC_RESOURCE="your-foundry-resource-name"  # Replace with your Azure Foundry resource name (subdomain before .services.ai.azure.com)
+$env:ANTHROPIC_DEPLOYMENT_NAME="claude-haiku-4-5"  # Optional, defaults to claude-haiku-4-5
+```
+
+**Note**: When using Azure Foundry with Azure CLI, make sure you're logged in with `az login` and have access to the Azure Foundry resource. For more information, see the [Azure CLI documentation](https://learn.microsoft.com/cli/azure/authenticate-azure-cli-interactively).