Obsolete Roots, Sampling, and Logging surface area per SEP-2577 (#1651)

Co-authored-by: Tarek Mahmoud Sayed <tarekms@ntdev.microsoft.com>

src/ModelContextProtocol/McpRequestFilterBuilderExtensions.cs

@@ -165,6 +165,7 @@ public static class McpRequestFilterBuilderExtensions
     /// <param name="builder">The request filter builder instance.</param>
     /// <param name="filter">The filter function that wraps the handler.</param>
     /// <returns>The builder provided in <paramref name="builder"/>.</returns>
+    [Obsolete(Obsoletions.DeprecatedLogging_Message, DiagnosticId = Obsoletions.Deprecated_DiagnosticId, UrlFormat = Obsoletions.Deprecated_Url)]
     public static IMcpRequestFilterBuilder AddSetLoggingLevelFilter(this IMcpRequestFilterBuilder builder, McpRequestFilter<SetLevelRequestParams, EmptyResult> filter)
     {
         Throw.IfNull(builder);

src/ModelContextProtocol/McpServerBuilderExtensions.cs

@@ -878,6 +878,7 @@ public static partial class McpServerBuilderExtensions
     /// most recently set level.
     /// </para>
     /// </remarks>
+    [Obsolete(Obsoletions.DeprecatedLogging_Message, DiagnosticId = Obsoletions.Deprecated_DiagnosticId, UrlFormat = Obsoletions.Deprecated_Url)]
     public static IMcpServerBuilder WithSetLoggingLevelHandler(this IMcpServerBuilder builder, McpRequestHandler<SetLevelRequestParams, EmptyResult> handler)
     {
         Throw.IfNull(builder);

src/ModelContextProtocol/ModelContextProtocol.csproj

@@ -16,6 +16,11 @@
     <IsAotCompatible>true</IsAotCompatible>
   </PropertyGroup>
 
+  <PropertyGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">
+    <!-- CS0436: Allow ObsoleteAttribute to be redefined internally -->
+    <NoWarn>$(NoWarn);CS0436</NoWarn>
+  </PropertyGroup>
+
   <ItemGroup>
     <Compile Include="..\Common\Throw.cs" Link="Throw.cs" />
     <Compile Include="..\Common\Obsoletions.cs" Link="Obsoletions.cs" />