Remove server back-references from protocol DTO types (#1345)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>
Co-authored-by: Stephen Toub <stoub@microsoft.com>

src/ModelContextProtocol.Core/Protocol/Prompt.cs

@@ -1,7 +1,6 @@
 using System.Diagnostics;
 using System.Text.Json.Nodes;
 using System.Text.Json.Serialization;
-using ModelContextProtocol.Server;
 
 namespace ModelContextProtocol.Protocol;
 
@@ -72,12 +71,6 @@ public sealed class Prompt : IBaseMetadata
     [JsonPropertyName("_meta")]
     public JsonObject? Meta { get; set; }
 
-    /// <summary>
-    /// Gets or sets the callable server prompt corresponding to this metadata if any.
-    /// </summary>
-    [JsonIgnore]
-    public McpServerPrompt? McpServerPrompt { get; set; }
-
     [DebuggerBrowsable(DebuggerBrowsableState.Never)]
     private string DebuggerDisplay
     {

src/ModelContextProtocol.Core/Protocol/Resource.cs

@@ -2,7 +2,6 @@ using System.Diagnostics;
 using System.Diagnostics.CodeAnalysis;
 using System.Text.Json.Nodes;
 using System.Text.Json.Serialization;
-using ModelContextProtocol.Server;
 
 namespace ModelContextProtocol.Protocol;
 
@@ -101,10 +100,4 @@ public sealed class Resource : IBaseMetadata
     /// </remarks>
     [JsonPropertyName("_meta")]
     public JsonObject? Meta { get; set; }
-
-    /// <summary>
-    /// Gets or sets the callable server resource corresponding to this metadata if any.
-    /// </summary>
-    [JsonIgnore]
-    public McpServerResource? McpServerResource { get; set; }
 }

src/ModelContextProtocol.Core/Protocol/ResourceTemplate.cs

@@ -1,6 +1,5 @@
 using System.Text.Json.Nodes;
 using System.Text.Json.Serialization;
-using ModelContextProtocol.Server;
 
 namespace ModelContextProtocol.Protocol;
 
@@ -94,12 +93,6 @@ public sealed class ResourceTemplate : IBaseMetadata
     [JsonIgnore]
     public bool IsTemplated => UriTemplate.Contains('{');
 
-    /// <summary>
-    /// Gets or sets the callable server resource corresponding to this metadata, if any.
-    /// </summary>
-    [JsonIgnore]
-    public McpServerResource? McpServerResource { get; set; }
-
     /// <summary>Converts the <see cref="ResourceTemplate"/> into a <see cref="Resource"/>.</summary>
     /// <returns>A <see cref="Resource"/> if <see cref="IsTemplated"/> is <see langword="false"/>; otherwise, <see langword="null"/>.</returns>
     public Resource? AsResource()
@@ -119,7 +112,6 @@ public sealed class ResourceTemplate : IBaseMetadata
             Annotations = Annotations,
             Icons = Icons,
             Meta = Meta,
-            McpServerResource = McpServerResource,
         };
     }
 }

src/ModelContextProtocol.Core/Protocol/Tool.cs

@@ -1,4 +1,3 @@
-using ModelContextProtocol.Server;
 using System.Diagnostics;
 using System.Diagnostics.CodeAnalysis;
 using System.Text.Json;
@@ -158,12 +157,6 @@ public sealed class Tool : IBaseMetadata
     [JsonPropertyName("_meta")]
     public JsonObject? Meta { get; set; }
 
-    /// <summary>
-    /// Gets or sets the callable server tool corresponding to this metadata if any.
-    /// </summary>
-    [JsonIgnore]
-    public McpServerTool? McpServerTool { get; set; }
-
     [DebuggerBrowsable(DebuggerBrowsableState.Never)]
     private string DebuggerDisplay
     {

src/ModelContextProtocol.Core/Server/AIFunctionMcpServerPrompt.cs

@@ -182,7 +182,6 @@ internal sealed class AIFunctionMcpServerPrompt : McpServerPrompt
     {
         AIFunction = function;
         ProtocolPrompt = prompt;
-        ProtocolPrompt.McpServerPrompt = this;
         _metadata = metadata;
     }
 

src/ModelContextProtocol.Core/Server/AIFunctionMcpServerResource.cs

@@ -294,7 +294,6 @@ internal sealed class AIFunctionMcpServerResource : McpServerResource
     {
         AIFunction = function;
         ProtocolResourceTemplate = resourceTemplate;
-        ProtocolResourceTemplate.McpServerResource = this;
         ProtocolResource = resourceTemplate.AsResource();
         _metadata = metadata;
 

src/ModelContextProtocol.Core/Server/AIFunctionMcpServerTool.cs

@@ -234,7 +234,6 @@ internal sealed partial class AIFunctionMcpServerTool : McpServerTool
 
         AIFunction = function;
         ProtocolTool = tool;
-        ProtocolTool.McpServerTool = this;
 
         _structuredOutputRequiresWrapping = structuredOutputRequiresWrapping;
         _metadata = metadata;