Add Anthropic (Claude) integration (#81)

* Add Claude LLM integration and example usage

* Refactor ClaudeService to remove memory dependencies

* Add Claude chat completion support to MCP service

Introduces ClaudeChatCompletionService and KernelBuilderExtensions to enable Anthropic Claude model integration in the MCP service. Updates McpService to support Claude as a backend, including prompt execution settings and service registration.

* Rename Claude integration to Anthropic throughout codebase

* Change Claude to Anthropic in file names

* versioning

Author: Madzionator

Examples/Examples/Chat/ChatExampleAnthropic.cs

@@ -0,0 +1,18 @@
+using Examples.Utils;
+using MaIN.Core.Hub;
+
+namespace Examples;
+
+public class ChatExampleAnthropic : IExample
+{
+    public async Task Start()
+    {
+        AnthropicExample.Setup(); //We need to provide Anthropic API key
+        Console.WriteLine("(Anthropic) ChatExample is running!");
+
+        await AIHub.Chat()
+            .WithModel("claude-sonnet-4-20250514")
+            .WithMessage("Write a haiku about programming on Monday morning.")
+            .CompleteAsync(interactive: true);
+    }
+}

Examples/Examples/Program.cs

@@ -73,6 +73,7 @@ static void RegisterExamples(IServiceCollection services)
     services.AddTransient<ChatWithReasoningDeepSeekExample>();
     services.AddTransient<ChatWithTextToSpeechExample>();
     services.AddTransient<ChatExampleGroqCloud>();
+    services.AddTransient<ChatExampleAnthropic>();
 }
 
 async Task RunSelectedExample(IServiceProvider serviceProvider)
@@ -163,6 +164,7 @@ public class ExampleRegistry(IServiceProvider serviceProvider)
             ("\u25a0 Gemini Chat with files", serviceProvider.GetRequiredService<ChatWithFilesExampleGemini>()),
             ("\u25a0 DeepSeek Chat with reasoning", serviceProvider.GetRequiredService<ChatWithReasoningDeepSeekExample>()),
             ("\u25a0 GroqCloud Chat", serviceProvider.GetRequiredService<ChatExampleGroqCloud>()),
+            ("\u25a0 Anthropic Chat", serviceProvider.GetRequiredService<ChatExampleAnthropic>()),
             ("\u25a0 McpClient example", serviceProvider.GetRequiredService<McpExample>()),
             ("\u25a0 McpAgent example", serviceProvider.GetRequiredService<McpAgentsExample>()),
             ("\u25a0 Chat with TTS example", serviceProvider.GetRequiredService<ChatWithTextToSpeechExample>()),

Examples/Examples/Utils/AnthropicExample.cs

@@ -0,0 +1,16 @@
+using MaIN.Core;
+using MaIN.Domain.Configuration;
+
+namespace Examples.Utils;
+
+public class AnthropicExample
+{
+    public static void Setup()
+    {
+        MaINBootstrapper.Initialize(configureSettings: (options) =>
+        {
+            options.BackendType = BackendType.Anthropic;
+            options.AnthropicKey = "<YOUR_ANTHROPIC_KEY>";
+        });
+    }
+}

Releases/0.5.1.md

@@ -0,0 +1,3 @@
+# 0.5.1 release
+
+Anthropic integration has been added.

src/MaIN.Core/.nuspec

@@ -2,7 +2,7 @@
 <package>
   <metadata>
     <id>MaIN.NET</id>
-    <version>0.5.0</version>
+    <version>0.5.1</version>
     <authors>Wisedev</authors>
     <owners>Wisedev</owners>
     <icon>favicon.png</icon>

src/MaIN.Domain/Configuration/MaINSettings.cs

@@ -11,6 +11,7 @@ public class MaINSettings
     public string? OpenAiKey { get; set; }
     public string? GeminiKey { get; set; }
     public string? DeepSeekKey { get; set; }
+    public string? AnthropicKey { get; set; }
     public string? GroqCloudKey { get; set; }
     public MongoDbSettings? MongoDbSettings { get; set; }
     public FileSystemSettings? FileSystemSettings { get; set; }
@@ -26,4 +27,5 @@ public enum BackendType
     Gemini = 2,
     DeepSeek = 3,
     GroqCloud = 4,
+    Anthropic = 5,
 }

src/MaIN.InferPage/Program.cs

@@ -1,4 +1,3 @@
-using System.Net.Mime;
 using MaIN.Core;
 using MaIN.Domain.Configuration;
 using MaIN.Domain.Models;
@@ -71,6 +70,12 @@
                 apiKeyVariable = "GROQ_API_KEY";
                 apiName = "GroqCloud";
                 break;
+
+            case "anthropic":
+                Utils.Anthropic = true;
+                apiKeyVariable = "ANTHROPIC_API_KEY";
+                apiName = "Anthropic";
+                break;
         }
 
         var key = Environment.GetEnvironmentVariable(apiKeyVariable);
@@ -116,6 +121,13 @@
         settings.BackendType = BackendType.GroqCloud;
     });
 }
+else if(Utils.Anthropic)
+{
+    builder.Services.AddMaIN(builder.Configuration, settings =>
+    {
+        settings.BackendType = BackendType.Anthropic;
+    });
+}
 else
 {
     if (Utils.Path == null && !KnownModels.IsModelSupported(Utils.Model!))

src/MaIN.InferPage/Utils.cs

@@ -11,6 +11,7 @@ public static class Utils
     public static bool Gemini { get; set; }
     public static bool DeepSeek { get; set; }
     public static bool GroqCloud { get; set; }
+    public static bool Anthropic { get; set; }
     public static string? Path { get; set; }
     public static bool Reason { get; set; }
 }

src/MaIN.Services/Constants/ServiceConstants.cs

@@ -9,6 +9,7 @@ public static class HttpClients
         public const string GeminiClient = "GeminiClient";
         public const string DeepSeekClient = "DeepSeekClient";
         public const string GroqCloudClient = "GroqCloudClient";
+        public const string AnthropicClient = "AnthropicClient";
         public const string ImageDownloadClient = "ImageDownloadClient";
         public const string ModelContextDownloadClient = "ModelContextDownloadClient";
     }
@@ -28,10 +29,13 @@ public static class ApiUrls
         public const string GeminiModels = "https://generativelanguage.googleapis.com/v1beta/models";
 
         public const string DeepSeekOpenAiChatCompletions = "https://api.deepseek.com/v1/chat/completions";
-        public const string DeepSeekModels = "https://api.deepseek.com/models";  
+        public const string DeepSeekModels = "https://api.deepseek.com/models";
 
         public const string GroqCloudOpenAiChatCompletions = "https://api.groq.com/openai/v1/chat/completions";
         public const string GroqCloudModels = "https://api.groq.com/openai/v1/models";
+
+        public const string AnthropicChatMessages = "https://api.anthropic.com/v1/messages";
+        public const string AnthropicModels = "https://api.anthropic.com/v1/models";
     }
 
     public static class Messages