From 2991f0d5554dd71410ccb4defe7a4512f4500974 Mon Sep 17 00:00:00 2001
From: "Kent C. Dodds" <me@kentcdodds.com>
Date: Thu, 29 May 2025 20:36:04 -0600
Subject: [PATCH] Make ResourceTemplate list callback optional

This removes the `| undefined` in exchange for optional because forcing the inclusion of `list` is unnecessary and confusing.

https://github.com/modelcontextprotocol/modelcontextprotocol/discussions/586
---
 src/server/mcp.ts | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/server/mcp.ts b/src/server/mcp.ts
index 5b864b8b..772470fb 100644
--- a/src/server/mcp.ts
+++ b/src/server/mcp.ts
@@ -934,9 +934,9 @@ export class ResourceTemplate {
     uriTemplate: string | UriTemplate,
     private _callbacks: {
       /**
-       * A callback to list all resources matching this template. This is required to specified, even if `undefined`, to avoid accidentally forgetting resource listing.
+       * A callback to list all resources matching this template.
        */
-      list: ListResourcesCallback | undefined;
+      list?: ListResourcesCallback;
 
       /**
        * An optional callback to autocomplete variables within the URI template. Useful for clients and users to discover possible values.
@@ -944,7 +944,7 @@ export class ResourceTemplate {
       complete?: {
         [variable: string]: CompleteResourceTemplateCallback;
       };
-    },
+    } = {},
   ) {
     this._uriTemplate =
       typeof uriTemplate === "string"