Introduce Capability Registry & Discovery

src/Capability/Attribute/McpPrompt.php

@@ -0,0 +1,32 @@
+<?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\Capability\Attribute;
+
+/**
+ * Marks a PHP method as an MCP Prompt generator.
+ * The method should return the prompt messages, potentially using arguments for templating.
+ *
+ * @author Kyrian Obikwelu <koshnawaza@gmail.com>
+ */
+#[\Attribute(\Attribute::TARGET_METHOD | \Attribute::TARGET_CLASS)]
+final class McpPrompt
+{
+    /**
+     * @param ?string $name        overrides the prompt name (defaults to method name)
+     * @param ?string $description Optional description of the prompt. Defaults to method DocBlock summary.
+     */
+    public function __construct(
+        public ?string $name = null,
+        public ?string $description = null,
+    ) {
+    }
+}