Add remarks for empty protocol capability types

Author: jozkee

src/ModelContextProtocol.Core/Protocol/CompletionsCapability.cs

@@ -16,8 +16,12 @@ namespace ModelContextProtocol.Protocol;
 /// <para>
 /// See the <see href="https://github.com/modelcontextprotocol/specification/blob/main/schema/">schema</see> for details.
 /// </para>
+/// <para>
+/// This class is intentionally empty as the Model Context Protocol specification does not
+/// currently define additional properties for sampling capabilities. Future versions of the
+/// specification may extend this capability with additional configuration options.
+/// </para>
 /// </remarks>
 public sealed class CompletionsCapability
 {
-    // Currently empty in the spec, but may be extended in the future.
 }

src/ModelContextProtocol.Core/Protocol/ElicitationCapability.cs

@@ -11,8 +11,12 @@ namespace ModelContextProtocol.Protocol;
 /// When this capability is enabled, an MCP server can request the client to provide additional information
 /// during interactions. The client must set a <see cref="ModelContextProtocol.Client.McpClientHandlers.ElicitationHandler"/> to process these requests.
 /// </para>
+/// <para>
+/// This class is intentionally empty as the Model Context Protocol specification does not
+/// currently define additional properties for sampling capabilities. Future versions of the
+/// specification may extend this capability with additional configuration options.
+/// </para>
 /// </remarks>
 public sealed class ElicitationCapability
 {
-    // Currently empty in the spec, but may be extended in the future.
 }

src/ModelContextProtocol.Core/Protocol/LoggingCapability.cs

@@ -4,10 +4,16 @@ namespace ModelContextProtocol.Protocol;
 /// Represents the logging capability configuration for a Model Context Protocol server.
 /// </summary>
 /// <remarks>
+/// <para>
 /// This capability allows clients to set the logging level and receive log messages from the server.
 /// See the <see href="https://github.com/modelcontextprotocol/specification/blob/main/schema/">schema</see> for details.
+/// </para>
+/// <para>
+/// This class is intentionally empty as the Model Context Protocol specification does not
+/// currently define additional properties for sampling capabilities. Future versions of the
+/// specification may extend this capability with additional configuration options.
+/// </para>
 /// </remarks>
 public sealed class LoggingCapability
 {
-    // Currently empty in the spec, but may be extended in the future
 }

src/ModelContextProtocol.Core/Protocol/SamplingCapability.cs

@@ -11,8 +11,12 @@ namespace ModelContextProtocol.Protocol;
 /// When this capability is enabled, an MCP server can request the client to generate content
 /// using an AI model. The client must set a <see cref="ModelContextProtocol.Client.McpClientHandlers.SamplingHandler"/> to process these requests.
 /// </para>
+/// <para>
+/// This class is intentionally empty as the Model Context Protocol specification does not
+/// currently define additional properties for sampling capabilities. Future versions of the
+/// specification may extend this capability with additional configuration options.
+/// </para>
 /// </remarks>
 public sealed class SamplingCapability
 {
-    // Currently empty in the spec, but may be extended in the future
 }