diff --git a/includes/Extensions/Batch37.php b/includes/Extensions/Batch37.php
index 2878d77..2ab0992 100644
--- a/includes/Extensions/Batch37.php
+++ b/includes/Extensions/Batch37.php
@@ -1,7 +1,10 @@
 <?php
 /**
  * Batch 37 — MailPoet tools (reads the plugin's own tables via $wpdb).
- * Net-new, GPL-2.0-or-later. See NOTICE.md. Inert unless MailPoet (MAILPOET_VERSION) is active.
+ * Net-new, GPL-2.0-or-later. See NOTICE.md.
+ * Inert unless MailPoet is active. NOTE: MailPoet does not define MAILPOET_VERSION
+ * as a plain constant at load; MAILPOET_MINIMUM_REQUIRED_WP_VERSION is defined whenever
+ * mailpoet.php loads, so we gate on either (verified live on mainwp 2026-10-16).
  */
 
 namespace AskTamMCP\Extensions;
@@ -11,7 +14,7 @@ defined('ABSPATH') || exit;
 class Batch37 {
 
     public static function register($registry): void {
-        if (!defined('MAILPOET_VERSION')) return;
+        if (!defined('MAILPOET_VERSION') && !defined('MAILPOET_MINIMUM_REQUIRED_WP_VERSION')) return;
 
         $def = function (string $name, string $desc, array $props, array $required, string $scope, string $method) {
             $schema = ['type' => 'object', 'properties' => $props ?: new \stdClass()];
@@ -29,7 +32,8 @@ class Batch37 {
     }
 
     public static function detect(array $args): array {
-        return ['active' => defined('MAILPOET_VERSION'), 'version' => defined('MAILPOET_VERSION') ? MAILPOET_VERSION : null];
+        $active = defined('MAILPOET_VERSION') || defined('MAILPOET_MINIMUM_REQUIRED_WP_VERSION');
+        return ['active' => $active, 'version' => defined('MAILPOET_VERSION') ? MAILPOET_VERSION : null];
     }
 
     private static function tbl(string $n): string { global $wpdb; return $wpdb->prefix . $n; }