Restore null conditional/forgiving operators on Params member access in src/

Agent-Logs-Url: https://github.com/modelcontextprotocol/csharp-sdk/sessions/57676fa6-299c-40eb-ba0b-a7cbedbcef91

Co-authored-by: stephentoub <2642209+stephentoub@users.noreply.github.com>

Author: Copilot

src/ModelContextProtocol.Core/Server/AIFunctionMcpServerPrompt.cs

@@ -201,7 +201,7 @@ public override async ValueTask<GetPromptResult> GetAsync(
         request.Services = new RequestServiceProvider<GetPromptRequestParams>(request);
         AIFunctionArguments arguments = new() { Services = request.Services };
 
-        if (request.Params.Arguments is { } argDict)
+        if (request.Params?.Arguments is { } argDict)
         {
             foreach (var kvp in argDict)
             {

src/ModelContextProtocol.Core/Server/AIFunctionMcpServerResource.cs

@@ -386,22 +386,22 @@ public override async ValueTask<ReadResourceResult> ReadAsync(
 
             TextContent tc => new()
             {
-                Contents = [new TextResourceContents { Uri = request.Params.Uri, MimeType = ProtocolResourceTemplate.MimeType, Text = tc.Text }],
+                Contents = [new TextResourceContents { Uri = request.Params!.Uri, MimeType = ProtocolResourceTemplate.MimeType, Text = tc.Text }],
             },
 
             DataContent dc => new()
             {
                 Contents = [new BlobResourceContents 
                 { 
-                    Uri = request.Params.Uri, 
+                    Uri = request.Params!.Uri, 
                     MimeType = dc.MediaType, 
                     Blob = EncodingUtilities.GetUtf8Bytes(dc.Base64Data.Span)
                 }],
             },
 
             string text => new()
             {
-                Contents = [new TextResourceContents { Uri = request.Params.Uri, MimeType = ProtocolResourceTemplate.MimeType, Text = text }],
+                Contents = [new TextResourceContents { Uri = request.Params!.Uri, MimeType = ProtocolResourceTemplate.MimeType, Text = text }],
             },
 
             IEnumerable<ResourceContents> contents => new()
@@ -416,14 +416,14 @@ public override async ValueTask<ReadResourceResult> ReadAsync(
                     {
                         TextContent tc => new TextResourceContents
                         {
-                            Uri = request.Params.Uri,
+                            Uri = request.Params!.Uri,
                             MimeType = ProtocolResourceTemplate.MimeType,
                             Text = tc.Text
                         },
 
                         DataContent dc => new BlobResourceContents
                         {
-                            Uri = request.Params.Uri,
+                            Uri = request.Params!.Uri,
                             MimeType = dc.MediaType,
                             Blob = EncodingUtilities.GetUtf8Bytes(dc.Base64Data.Span)
                         },
@@ -436,7 +436,7 @@ public override async ValueTask<ReadResourceResult> ReadAsync(
             {
                 Contents = strings.Select<string, ResourceContents>(text => new TextResourceContents
                 {
-                    Uri = request.Params.Uri,
+                    Uri = request.Params!.Uri,
                     MimeType = ProtocolResourceTemplate.MimeType,
                     Text = text
                 }).ToList(),

src/ModelContextProtocol.Core/Server/AIFunctionMcpServerTool.cs

@@ -262,7 +262,7 @@ public override async ValueTask<CallToolResult> InvokeAsync(
         request.Services = new RequestServiceProvider<CallToolRequestParams>(request);
         AIFunctionArguments arguments = new() { Services = request.Services };
 
-        if (request.Params.Arguments is { } argDict)
+        if (request.Params?.Arguments is { } argDict)
         {
             foreach (var kvp in argDict)
             {

src/ModelContextProtocol.Core/Server/RequestServiceProvider.cs

@@ -27,7 +27,7 @@ public static bool IsAugmentedWith(Type serviceType) =>
         serviceType == typeof(RequestContext<TRequestParams>) ? request :
         serviceType == typeof(McpServer) ? request.Server :
         serviceType == typeof(IProgress<ProgressNotificationValue>) ?
-            (request.Params.ProgressToken is { } progressToken ? new TokenProgress(request.Server, progressToken) : NullProgress.Instance) :
+            (request.Params?.ProgressToken is { } progressToken ? new TokenProgress(request.Server, progressToken) : NullProgress.Instance) :
         serviceType == typeof(ClaimsPrincipal) ? request.User :
         _innerServices?.GetService(serviceType);