Introduce Capability Registry & Discovery

src/Capability/Attribute/McpResource.php

@@ -0,0 +1,42 @@
+<?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;
+
+use Mcp\Schema\Annotations;
+
+/**
+ * Marks a PHP class as representing or handling a specific MCP Resource instance.
+ * Used primarily for the 'resources/list' discovery.
+ *
+ * @author Kyrian Obikwelu <koshnawaza@gmail.com>
+ */
+#[\Attribute(\Attribute::TARGET_METHOD | \Attribute::TARGET_CLASS)]
+final class McpResource
+{
+    /**
+     * @param string           $uri         The specific URI identifying this resource instance. Must be unique within the server.
+     * @param ?string          $name        A human-readable name for this resource. If null, a default might be generated from the method name.
+     * @param ?string          $description An optional description of the resource. Defaults to class DocBlock summary.
+     * @param ?string          $mimeType    the MIME type, if known and constant for this resource
+     * @param ?int             $size        the size in bytes, if known and constant
+     * @param Annotations|null $annotations optional annotations describing the resource
+     */
+    public function __construct(
+        public string $uri,
+        public ?string $name = null,
+        public ?string $description = null,
+        public ?string $mimeType = null,
+        public ?int $size = null,
+        public ?Annotations $annotations = null,
+    ) {
+    }
+}