Use IList for filter collections in options

Author: halter73

src/ModelContextProtocol.Core/Server/McpMessageFilters.cs

@@ -21,7 +21,7 @@ public sealed class McpMessageFilters
     /// the next handler in the pipeline, the default handlers will not be executed.
     /// </para>
     /// </remarks>
-    public List<McpMessageFilter> IncomingFilters { get; } = [];
+    public IList<McpMessageFilter> IncomingFilters { get; } = [];
 
     /// <summary>
     /// Gets the filters for all outgoing JSON-RPC messages.
@@ -38,5 +38,5 @@ public sealed class McpMessageFilters
     /// server-to-client messages.
     /// </para>
     /// </remarks>
-    public List<McpMessageFilter> OutgoingFilters { get; } = [];
+    public IList<McpMessageFilter> OutgoingFilters { get; } = [];
 }

src/ModelContextProtocol.Core/Server/McpRequestFilters.cs

@@ -22,7 +22,7 @@ public sealed class McpRequestFilters
     /// Tools from both sources will be combined when returning results to clients.
     /// </para>
     /// </remarks>
-    public List<McpRequestFilter<ListToolsRequestParams, ListToolsResult>> ListToolsFilters { get; } = [];
+    public IList<McpRequestFilter<ListToolsRequestParams, ListToolsResult>> ListToolsFilters { get; } = [];
 
     /// <summary>
     /// Gets the filters for the call-tool handler pipeline.
@@ -32,7 +32,7 @@ public sealed class McpRequestFilters
     /// The filters can modify, log, or perform additional operations on requests and responses for
     /// <see cref="RequestMethods.ToolsCall"/> requests. The handler should implement logic to execute the requested tool and return appropriate results.
     /// </remarks>
-    public List<McpRequestFilter<CallToolRequestParams, CallToolResult>> CallToolFilters { get; } = [];
+    public IList<McpRequestFilter<CallToolRequestParams, CallToolResult>> CallToolFilters { get; } = [];
 
     /// <summary>
     /// Gets the filters for the list-prompts handler pipeline.
@@ -49,7 +49,7 @@ public sealed class McpRequestFilters
     /// Prompts from both sources will be combined when returning results to clients.
     /// </para>
     /// </remarks>
-    public List<McpRequestFilter<ListPromptsRequestParams, ListPromptsResult>> ListPromptsFilters { get; } = [];
+    public IList<McpRequestFilter<ListPromptsRequestParams, ListPromptsResult>> ListPromptsFilters { get; } = [];
 
     /// <summary>
     /// Gets the filters for the get-prompt handler pipeline.
@@ -59,7 +59,7 @@ public sealed class McpRequestFilters
     /// The filters can modify, log, or perform additional operations on requests and responses for
     /// <see cref="RequestMethods.PromptsGet"/> requests. The handler should implement logic to fetch or generate the requested prompt and return appropriate results.
     /// </remarks>
-    public List<McpRequestFilter<GetPromptRequestParams, GetPromptResult>> GetPromptFilters { get; } = [];
+    public IList<McpRequestFilter<GetPromptRequestParams, GetPromptResult>> GetPromptFilters { get; } = [];
 
     /// <summary>
     /// Gets the filters for the list-resource-templates handler pipeline.
@@ -70,7 +70,7 @@ public sealed class McpRequestFilters
     /// <see cref="RequestMethods.ResourcesTemplatesList"/> requests. It supports pagination through the cursor mechanism,
     /// where the client can make repeated calls with the cursor returned by the previous call to retrieve more resource templates.
     /// </remarks>
-    public List<McpRequestFilter<ListResourceTemplatesRequestParams, ListResourceTemplatesResult>> ListResourceTemplatesFilters { get; } = [];
+    public IList<McpRequestFilter<ListResourceTemplatesRequestParams, ListResourceTemplatesResult>> ListResourceTemplatesFilters { get; } = [];
 
     /// <summary>
     /// Gets the filters for the list-resources handler pipeline.
@@ -81,7 +81,7 @@ public sealed class McpRequestFilters
     /// <see cref="RequestMethods.ResourcesList"/> requests. It supports pagination through the cursor mechanism,
     /// where the client can make repeated calls with the cursor returned by the previous call to retrieve more resources.
     /// </remarks>
-    public List<McpRequestFilter<ListResourcesRequestParams, ListResourcesResult>> ListResourcesFilters { get; } = [];
+    public IList<McpRequestFilter<ListResourcesRequestParams, ListResourcesResult>> ListResourcesFilters { get; } = [];
 
     /// <summary>
     /// Gets the filters for the read-resource handler pipeline.
@@ -91,7 +91,7 @@ public sealed class McpRequestFilters
     /// The filters can modify, log, or perform additional operations on requests and responses for
     /// <see cref="RequestMethods.ResourcesRead"/> requests. The handler should implement logic to locate and retrieve the requested resource.
     /// </remarks>
-    public List<McpRequestFilter<ReadResourceRequestParams, ReadResourceResult>> ReadResourceFilters { get; } = [];
+    public IList<McpRequestFilter<ReadResourceRequestParams, ReadResourceResult>> ReadResourceFilters { get; } = [];
 
     /// <summary>
     /// Gets the filters for the complete-handler pipeline.
@@ -102,7 +102,7 @@ public sealed class McpRequestFilters
     /// <see cref="RequestMethods.CompletionComplete"/> requests. The handler processes auto-completion requests, returning a list of suggestions based on the
     /// reference type and current argument value.
     /// </remarks>
-    public List<McpRequestFilter<CompleteRequestParams, CompleteResult>> CompleteFilters { get; } = [];
+    public IList<McpRequestFilter<CompleteRequestParams, CompleteResult>> CompleteFilters { get; } = [];
 
     /// <summary>
     /// Gets the filters for the subscribe-to-resources handler pipeline.
@@ -119,7 +119,7 @@ public sealed class McpRequestFilters
     /// whenever a relevant resource is created, updated, or deleted.
     /// </para>
     /// </remarks>
-    public List<McpRequestFilter<SubscribeRequestParams, EmptyResult>> SubscribeToResourcesFilters { get; } = [];
+    public IList<McpRequestFilter<SubscribeRequestParams, EmptyResult>> SubscribeToResourcesFilters { get; } = [];
 
     /// <summary>
     /// Gets the filters for the unsubscribe-from-resources handler pipeline.
@@ -136,7 +136,7 @@ public sealed class McpRequestFilters
     /// to the client for the specified resources.
     /// </para>
     /// </remarks>
-    public List<McpRequestFilter<UnsubscribeRequestParams, EmptyResult>> UnsubscribeFromResourcesFilters { get; } = [];
+    public IList<McpRequestFilter<UnsubscribeRequestParams, EmptyResult>> UnsubscribeFromResourcesFilters { get; } = [];
 
     /// <summary>
     /// Gets the filters for the set-logging-level handler pipeline.
@@ -153,5 +153,5 @@ public sealed class McpRequestFilters
     /// at or above the specified level to the client as notifications/message notifications.
     /// </para>
     /// </remarks>
-    public List<McpRequestFilter<SetLevelRequestParams, EmptyResult>> SetLoggingLevelFilters { get; } = [];
+    public IList<McpRequestFilter<SetLevelRequestParams, EmptyResult>> SetLoggingLevelFilters { get; } = [];
 }