Adopt Schema component in server handlers

src/Server/RequestHandler/CallToolHandler.php

@@ -0,0 +1,50 @@
+<?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\RequestHandler;
+
+use Mcp\Capability\Tool\ToolExecutorInterface;
+use Mcp\Exception\ExceptionInterface;
+use Mcp\Schema\JsonRpc\Error;
+use Mcp\Schema\JsonRpc\HasMethodInterface;
+use Mcp\Schema\JsonRpc\Response;
+use Mcp\Schema\Request\CallToolRequest;
+use Mcp\Server\MethodHandlerInterface;
+
+/**
+ * @author Christopher Hertel <mail@christopher-hertel.de>
+ * @author Tobias Nyholm <tobias.nyholm@gmail.com>
+ */
+final class CallToolHandler implements MethodHandlerInterface
+{
+    public function __construct(
+        private readonly ToolExecutorInterface $toolExecutor,
+    ) {
+    }
+
+    public function supports(HasMethodInterface $message): bool
+    {
+        return $message instanceof CallToolRequest;
+    }
+
+    public function handle(CallToolRequest|HasMethodInterface $message): Response|Error
+    {
+        \assert($message instanceof CallToolRequest);
+
+        try {
+            $result = $this->toolExecutor->call($message);
+        } catch (ExceptionInterface) {
+            return Error::forInternalError('Error while executing tool', $message->getId());
+        }
+
+        return new Response($message->getId(), $result);
+    }
+}