Add request handler for resource templates (#89)

src/Server/Handler/JsonRpcHandler.php

@@ -86,6 +86,7 @@ class JsonRpcHandler
                 new Handler\Request\GetPromptHandler($promptGetter),
                 new Handler\Request\ListResourcesHandler($referenceProvider, $paginationLimit),
                 new Handler\Request\ReadResourceHandler($resourceReader),
+                new Handler\Request\ListResourceTemplatesHandler($referenceProvider, $paginationLimit),
                 new Handler\Request\CallToolHandler($toolCaller, $logger),
                 new Handler\Request\ListToolsHandler($referenceProvider, $paginationLimit),
             ],

src/Server/Handler/Request/ListResourceTemplatesHandler.php

@@ -0,0 +1,53 @@
+<?php
+
+/*
+ * This file is part of the official PHP MCP SDK.
+ *
+ * A collaboration between Symfony and the PHP Foundation.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Mcp\Server\Handler\Request;
+
+use Mcp\Capability\Registry\ReferenceProviderInterface;
+use Mcp\Exception\InvalidCursorException;
+use Mcp\Schema\JsonRpc\HasMethodInterface;
+use Mcp\Schema\JsonRpc\Response;
+use Mcp\Schema\Request\ListResourceTemplatesRequest;
+use Mcp\Schema\Result\ListResourceTemplatesResult;
+use Mcp\Server\Handler\MethodHandlerInterface;
+use Mcp\Server\Session\SessionInterface;
+
+/**
+ * @author Christopher Hertel <mail@christopher-hertel.de>
+ */
+final class ListResourceTemplatesHandler implements MethodHandlerInterface
+{
+    public function __construct(
+        private readonly ReferenceProviderInterface $registry,
+        private readonly int $pageSize = 20,
+    ) {
+    }
+
+    public function supports(HasMethodInterface $message): bool
+    {
+        return $message instanceof ListResourceTemplatesRequest;
+    }
+
+    /**
+     * @throws InvalidCursorException
+     */
+    public function handle(ListResourceTemplatesRequest|HasMethodInterface $message, SessionInterface $session): Response
+    {
+        \assert($message instanceof ListResourceTemplatesRequest);
+
+        $page = $this->registry->getResourceTemplates($this->pageSize, $message->cursor);
+
+        return new Response(
+            $message->getId(),
+            new ListResourceTemplatesResult($page->references, $page->nextCursor),
+        );
+    }
+}