Adopt Schema component in server handlers

src/Server/RequestHandler/ListPromptsHandler.php

@@ -0,0 +1,64 @@
+<?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\Prompt\CollectionInterface;
+use Mcp\Schema\JsonRpc\HasMethodInterface;
+use Mcp\Schema\JsonRpc\Response;
+use Mcp\Schema\Prompt;
+use Mcp\Schema\PromptArgument;
+use Mcp\Schema\Request\ListPromptsRequest;
+use Mcp\Schema\Result\ListPromptsResult;
+use Mcp\Server\MethodHandlerInterface;
+
+/**
+ * @author Tobias Nyholm <tobias.nyholm@gmail.com>
+ */
+final class ListPromptsHandler implements MethodHandlerInterface
+{
+    public function __construct(
+        private readonly CollectionInterface $collection,
+        private readonly int $pageSize = 20,
+    ) {
+    }
+
+    public function supports(HasMethodInterface $message): bool
+    {
+        return $message instanceof ListPromptsRequest;
+    }
+
+    public function handle(ListPromptsRequest|HasMethodInterface $message): Response
+    {
+        \assert($message instanceof ListPromptsRequest);
+
+        $cursor = null;
+        $prompts = [];
+
+        $metadataList = $this->collection->getMetadata($this->pageSize, $message->cursor);
+
+        foreach ($metadataList as $metadata) {
+            $cursor = $metadata->getName();
+            $prompts[] = new Prompt(
+                $metadata->getName(),
+                $metadata->getDescription(),
+                array_map(fn (array $data) => PromptArgument::fromArray($data), $metadata->getArguments()),
+            );
+        }
+
+        $nextCursor = (null !== $cursor && \count($prompts) === $this->pageSize) ? $cursor : null;
+
+        return new Response(
+            $message->getId(),
+            new ListPromptsResult($prompts, $nextCursor),
+        );
+    }
+}