diff --git a/src/ModelContextProtocol.NET.Core/Models/Protocol/Shared/Content/EmbeddedResource.cs b/src/ModelContextProtocol.NET.Core/Models/Protocol/Shared/Content/EmbeddedResource.cs
index c61b89a..854b58c 100644
--- a/src/ModelContextProtocol.NET.Core/Models/Protocol/Shared/Content/EmbeddedResource.cs
+++ b/src/ModelContextProtocol.NET.Core/Models/Protocol/Shared/Content/EmbeddedResource.cs
@@ -1,7 +1,10 @@
-namespace ModelContextProtocol.NET.Core.Models.Protocol.Shared.Content;
+using System.Text.Json.Serialization;
+
+namespace ModelContextProtocol.NET.Core.Models.Protocol.Shared.Content;
 
 public record EmbeddedResource : Annotated
 {
+    [JsonIgnore]
     public string Type => "resource";
     public required ResourceContents Resource { get; init; }
 }
diff --git a/src/ModelContextProtocol.NET.Core/Models/Protocol/Shared/Content/ImageContent.cs b/src/ModelContextProtocol.NET.Core/Models/Protocol/Shared/Content/ImageContent.cs
index b0acdb8..6c28ec8 100644
--- a/src/ModelContextProtocol.NET.Core/Models/Protocol/Shared/Content/ImageContent.cs
+++ b/src/ModelContextProtocol.NET.Core/Models/Protocol/Shared/Content/ImageContent.cs
@@ -1,7 +1,10 @@
-namespace ModelContextProtocol.NET.Core.Models.Protocol.Shared.Content;
+using System.Text.Json.Serialization;
+
+namespace ModelContextProtocol.NET.Core.Models.Protocol.Shared.Content;
 
 public record ImageContent : Annotated
 {
+    [JsonIgnore]
     public string Type => "image";
     public required string Data { get; init; }
     public required string MimeType { get; init; }
diff --git a/src/ModelContextProtocol.NET.Core/Models/Protocol/Shared/Content/TextContent.cs b/src/ModelContextProtocol.NET.Core/Models/Protocol/Shared/Content/TextContent.cs
index fe508b7..58cf4ce 100644
--- a/src/ModelContextProtocol.NET.Core/Models/Protocol/Shared/Content/TextContent.cs
+++ b/src/ModelContextProtocol.NET.Core/Models/Protocol/Shared/Content/TextContent.cs
@@ -1,7 +1,10 @@
+using System.Text.Json.Serialization;
+
 namespace ModelContextProtocol.NET.Core.Models.Protocol.Shared.Content;
 
 public record TextContent : Annotated
 {
+    [JsonIgnore]
     public string Type => "text";
     public required string Text { get; init; }