Remove internal usages of obsolete capability properties

Co-authored-by: MackinnonBuck <10456961+MackinnonBuck@users.noreply.github.com>

Author: Copilot

src/ModelContextProtocol.Core/Client/McpClientImpl.cs

@@ -58,12 +58,10 @@ private void RegisterHandlers(McpClientOptions options, NotificationHandlers not
     {
         McpClientHandlers handlers = options.Handlers;
 
-#pragma warning disable CS0618 // Type or member is obsolete
-        var notificationHandlersFromOptions = handlers.NotificationHandlers ?? options.Capabilities?.NotificationHandlers;
-        var samplingHandler = handlers.SamplingHandler ?? options.Capabilities?.Sampling?.SamplingHandler;
-        var rootsHandler = handlers.RootsHandler ?? options.Capabilities?.Roots?.RootsHandler;
-        var elicitationHandler = handlers.ElicitationHandler ?? options.Capabilities?.Elicitation?.ElicitationHandler;
-#pragma warning restore CS0618 // Type or member is obsolete
+        var notificationHandlersFromOptions = handlers.NotificationHandlers;
+        var samplingHandler = handlers.SamplingHandler;
+        var rootsHandler = handlers.RootsHandler;
+        var elicitationHandler = handlers.ElicitationHandler;
 
         if (notificationHandlersFromOptions is not null)
         {

src/ModelContextProtocol.Core/Server/McpServerImpl.cs

@@ -230,10 +230,6 @@ private void ConfigureCompletion(McpServerOptions options)
         var completeHandler = options.Handlers.CompleteHandler;
         var completionsCapability = options.Capabilities?.Completions;
 
-#pragma warning disable CS0618 // Type or member is obsolete
-        completeHandler ??= completionsCapability?.CompleteHandler;
-#pragma warning restore CS0618 // Type or member is obsolete
-
         if (completeHandler is null && completionsCapability is null)
         {
             return;
@@ -266,14 +262,6 @@ private void ConfigureResources(McpServerOptions options)
         var resources = options.ResourceCollection;
         var resourcesCapability = options.Capabilities?.Resources;
 
-#pragma warning disable CS0618 // Type or member is obsolete
-        listResourcesHandler ??= resourcesCapability?.ListResourcesHandler;
-        listResourceTemplatesHandler ??= resourcesCapability?.ListResourceTemplatesHandler;
-        readResourceHandler ??= resourcesCapability?.ReadResourceHandler;
-        subscribeHandler ??= resourcesCapability?.SubscribeToResourcesHandler;
-        unsubscribeHandler ??= resourcesCapability?.UnsubscribeFromResourcesHandler;
-#pragma warning restore CS0618 // Type or member is obsolete
-
         if (listResourcesHandler is null && listResourceTemplatesHandler is null && readResourceHandler is null &&
             subscribeHandler is null && unsubscribeHandler is null && resources is null &&
             resourcesCapability is null)
@@ -427,11 +415,6 @@ private void ConfigurePrompts(McpServerOptions options)
         var prompts = options.PromptCollection;
         var promptsCapability = options.Capabilities?.Prompts;
 
-#pragma warning disable CS0618 // Type or member is obsolete
-        listPromptsHandler ??= promptsCapability?.ListPromptsHandler;
-        getPromptHandler ??= promptsCapability?.GetPromptHandler;
-#pragma warning restore CS0618 // Type or member is obsolete
-
         if (listPromptsHandler is null && getPromptHandler is null && prompts is null &&
             promptsCapability is null)
         {
@@ -515,11 +498,6 @@ private void ConfigureTools(McpServerOptions options)
         var tools = options.ToolCollection;
         var toolsCapability = options.Capabilities?.Tools;
 
-#pragma warning disable CS0618 // Type or member is obsolete
-        listToolsHandler ??= toolsCapability?.ListToolsHandler;
-        callToolHandler ??= toolsCapability?.CallToolHandler;
-#pragma warning restore CS0618 // Type or member is obsolete
-
         if (listToolsHandler is null && callToolHandler is null && tools is null &&
             toolsCapability is null)
         {
@@ -618,10 +596,6 @@ private void ConfigureLogging(McpServerOptions options)
         // We don't require that the handler be provided, as we always store the provided log level to the server.
         var setLoggingLevelHandler = options.Handlers.SetLoggingLevelHandler;
 
-#pragma warning disable CS0618 // Type or member is obsolete
-        setLoggingLevelHandler ??= options.Capabilities?.Logging?.SetLoggingLevelHandler;
-#pragma warning restore CS0618 // Type or member is obsolete
-
         // Apply filters to the handler
         if (setLoggingLevelHandler is not null)
         {