diff --git a/docs/CreateNotificationSuccessResponse.md b/docs/CreateNotificationSuccessResponse.md
index 6da3e5f..f889229 100644
--- a/docs/CreateNotificationSuccessResponse.md
+++ b/docs/CreateNotificationSuccessResponse.md
@@ -4,7 +4,7 @@
 
 | Name | Type | Description | Notes |
 | ---- | ---- | ----------- | ----- |
-| **id** | **String** | Notification identifier when the request created a notification. An empty string means no notification was created; read `errors` for details (HTTP may still be 200). | [optional] |
+| **id** | **String** | Notification identifier when the request created a notification. An empty string means no notification was created; read `errors` for details (HTTP may still be 200). All OneSignal server SDKs expose message-sent / message-not-sent narrowing helpers (named idiomatically per language — e.g. `isMessageSent`, `is_message_sent`, `message_sent?`); prefer them over comparing `id` directly. | [optional] |
 | **external_id** | **String** | Optional correlation / idempotency-related value from the API response. This is not the end-user External ID used for targeting recipients (that lives under `include_aliases.external_id`). | [optional] |
 | **errors** | **Object** | Polymorphic field: may be an array of human-readable strings and/or an object (for example with `invalid_aliases`, `invalid_external_user_ids`, or `invalid_player_ids`) depending on the API response; HTTP may still be 200 with partial success. Typed SDKs model this loosely so both shapes deserialize. | [optional] |
 
diff --git a/lib/onesignal/helpers.rb b/lib/onesignal/helpers.rb
index ac8d7a9..f6f7ab3 100644
--- a/lib/onesignal/helpers.rb
+++ b/lib/onesignal/helpers.rb
@@ -54,6 +54,30 @@ def self.create_notification_with_retry(api, notification, max_retries: 3, base_
       end
     end
 
+    # Whether a POST /notifications 200 response is the "message sent" branch.
+    #
+    # POST /notifications returns 200 in two cases that share the
+    # CreateNotificationSuccessResponse shape: a notification was created
+    # (non-empty +id+), or none was (empty +id+, with +errors+ carrying the
+    # reason). Prefer this guard over inspecting +id+ directly.
+    #
+    # @param response [CreateNotificationSuccessResponse]
+    # @return [Boolean] true when a notification was created
+    def self.message_sent?(response)
+      id = response.respond_to?(:id) ? response.id : nil
+      id.is_a?(String) && !id.empty?
+    end
+
+    # Whether a POST /notifications 200 response is the "message not sent"
+    # branch -- no notification was created (+id+ absent or empty); inspect
+    # +errors+ for why.
+    #
+    # @param response [CreateNotificationSuccessResponse]
+    # @return [Boolean] true when no notification was created
+    def self.message_not_sent?(response)
+      !message_sent?(response)
+    end
+
     def self.header_value(headers, name)
       return nil unless headers.respond_to?(:each_pair)
 
diff --git a/lib/onesignal/models/create_notification_success_response.rb b/lib/onesignal/models/create_notification_success_response.rb
index 72c7f40..3b9e83c 100644
--- a/lib/onesignal/models/create_notification_success_response.rb
+++ b/lib/onesignal/models/create_notification_success_response.rb
@@ -15,7 +15,7 @@
 
 module OneSignal
   class CreateNotificationSuccessResponse
-    # Notification identifier when the request created a notification. An empty string means no notification was created; read `errors` for details (HTTP may still be 200).
+    # Notification identifier when the request created a notification. An empty string means no notification was created; read `errors` for details (HTTP may still be 200). All OneSignal server SDKs expose message-sent / message-not-sent narrowing helpers (named idiomatically per language — e.g. `isMessageSent`, `is_message_sent`, `message_sent?`); prefer them over comparing `id` directly.
     attr_accessor :id
 
     # Optional correlation / idempotency-related value from the API response. This is not the end-user External ID used for targeting recipients (that lives under `include_aliases.external_id`).