Ensures Role is returned as Enum #31

Anthropic.SDK/Anthropic.SDK.csproj

@@ -14,12 +14,12 @@
 	  <PackageTags>Claude, AI, ML, API, Anthropic</PackageTags>
 	  <Title>Claude API</Title>
 	  <PackageReleaseNotes>
-		  Simpler use of Messages and Responses, cleaner function calls, and more robust error handling.
+		  RoleType for MessageResponse and StreamMessage.
 	  </PackageReleaseNotes>
 	  <PackageId>Anthropic.SDK</PackageId>
-	  <Version>3.2.0</Version>
-	  <AssemblyVersion>3.2.0.0</AssemblyVersion>
-	  <FileVersion>3.2.0.0</FileVersion>
+	  <Version>3.2.1</Version>
+	  <AssemblyVersion>3.2.1.0</AssemblyVersion>
+	  <FileVersion>3.2.1.0</FileVersion>
 	  <GenerateDocumentationFile>True</GenerateDocumentationFile>
 	  <PackageReadmeFile>README.md</PackageReadmeFile>
 	  <ProduceReferenceAssembly>True</ProduceReferenceAssembly>

Anthropic.SDK/EndpointBase.cs

@@ -127,7 +127,7 @@ private async Task<HttpResponseMessage> HttpRequestRaw(string url = null, HttpMe
                     var options = new JsonSerializerOptions
                     {
                         DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull,
-                        Converters = { new ContentConverter(), new JsonStringEnumConverter(JsonNamingPolicy.CamelCase) }
+                        Converters = { new ContentConverter() }
                     };
                     string jsonContent = JsonSerializer.Serialize(postData, options);
                     var stringContent = new StringContent(jsonContent, Encoding.UTF8, "application/json");

Anthropic.SDK/Extensions/RoleTypeConverter.cs

@@ -0,0 +1,34 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+using Anthropic.SDK.Messaging;
+
+namespace Anthropic.SDK.Extensions
+{
+    public class RoleTypeConverter : JsonConverter<RoleType>
+    {
+        public override RoleType Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+        {
+            string value = reader.GetString();
+            return value switch
+            {
+                "user" => RoleType.User,
+                "assistant" => RoleType.Assistant,
+                _ => throw new JsonException($"Unknown role type: {value}")
+            };
+        }
+
+        public override void Write(Utf8JsonWriter writer, RoleType value, JsonSerializerOptions options)
+        {
+            string roleString = value switch
+            {
+                RoleType.User => "user",
+                RoleType.Assistant => "assistant",
+                _ => throw new InvalidOperationException("Invalid role type")
+            };
+            writer.WriteStringValue(roleString);
+        }
+    }
+}

Anthropic.SDK/Messaging/Message.cs

@@ -4,6 +4,7 @@
 using System.Text;
 using System.Text.Json.Serialization;
 using Anthropic.SDK.Common;
+using Anthropic.SDK.Extensions;
 
 namespace Anthropic.SDK.Messaging
 {
@@ -39,6 +40,7 @@ public Message(Function toolCall, string functionResult, bool isError = false)
         /// Accepts <see cref="RoleType.User"/> or <see cref="RoleType.Assistant"/>
         /// </summary>
         [JsonPropertyName("role")]
+        [JsonConverter(typeof(RoleTypeConverter))]
         public RoleType Role { get; set; }
 
         /// <summary>

Anthropic.SDK/Messaging/MessageResponse.cs

@@ -4,6 +4,7 @@
 using System.Linq;
 using System.Text;
 using System.Text.Json.Serialization;
+using Anthropic.SDK.Extensions;
 
 namespace Anthropic.SDK.Messaging
 {
@@ -19,7 +20,8 @@ public class MessageResponse
         public string Model { get; set; }
 
         [JsonPropertyName("role")]
-        public string Role { get; set; }
+        [JsonConverter(typeof(RoleTypeConverter))]
+        public RoleType Role { get; set; }
 
         [JsonPropertyName("stop_reason")]
         public string StopReason { get; set; }
@@ -58,7 +60,8 @@ public class StreamMessage
         public string Type { get; set; }
 
         [JsonPropertyName("role")]
-        public string Role { get; set; }
+        [JsonConverter(typeof(RoleTypeConverter))]
+        public RoleType Role { get; set; }
 
         [JsonPropertyName("content")]
         public List<object> Content { get; set; }

Anthropic.SDK/Messaging/RoleType.cs

@@ -1,12 +1,15 @@
 using System;
 using System.Collections.Generic;
+using System.Runtime.Serialization;
 using System.Text;
 
 namespace Anthropic.SDK.Messaging
 {
     public enum RoleType
     {
+        [EnumMember(Value = "user")]
         User,
+        [EnumMember(Value = "assistant")]
         Assistant
     }
 }