diff --git a/includes/Extensions/Batch55.php b/includes/Extensions/Batch55.php
index 9b95bdd..a1193a6 100644
--- a/includes/Extensions/Batch55.php
+++ b/includes/Extensions/Batch55.php
@@ -1,7 +1,10 @@
 <?php
 /**
  * Batch 55 — Blocksy (Companion) tools. Net-new, GPL-2.0-or-later. See NOTICE.md.
- * Inert unless Blocksy Companion (BLOCKSY_COMPANION_VERSION) is active. Content blocks are the 'ct_content_block' CPT.
+ * Inert unless Blocksy Companion is active. NOTE: the companion plugin does not define
+ * BLOCKSY_COMPANION_VERSION; BLOCKSY_PATH / BLOCKSY_PLUGIN_BASE are defined whenever it
+ * loads, so we gate on either (verified live on mainwp 2026-10-16).
+ * Content blocks are the 'ct_content_block' CPT.
  */
 
 namespace AskTamMCP\Extensions;
@@ -11,7 +14,7 @@ defined('ABSPATH') || exit;
 class Batch55 {
 
     public static function register($registry): void {
-        if (!defined('BLOCKSY_COMPANION_VERSION')) return;
+        if (!defined('BLOCKSY_COMPANION_VERSION') && !defined('BLOCKSY_PATH')) return;
 
         $def = function (string $name, string $desc, array $props, array $required, string $scope, string $method) {
             $schema = ['type' => 'object', 'properties' => $props ?: new \stdClass()];
@@ -26,7 +29,9 @@ class Batch55 {
     }
 
     public static function detect(array $args): array {
-        return ['active' => defined('BLOCKSY_COMPANION_VERSION'), 'version' => defined('BLOCKSY_COMPANION_VERSION') ? BLOCKSY_COMPANION_VERSION : null];
+        $active = defined('BLOCKSY_COMPANION_VERSION') || defined('BLOCKSY_PATH');
+        $ver = defined('BLOCKSY_COMPANION_VERSION') ? BLOCKSY_COMPANION_VERSION : (defined('BLOCKSY_VERSION') ? BLOCKSY_VERSION : null);
+        return ['active' => $active, 'version' => $ver];
     }
 
     public static function listContentBlocks(array $args): array {