diff --git a/python/dify_plugin/interfaces/trigger/__init__.py b/python/dify_plugin/interfaces/trigger/__init__.py
index 197d30ad..800910c8 100644
--- a/python/dify_plugin/interfaces/trigger/__init__.py
+++ b/python/dify_plugin/interfaces/trigger/__init__.py
@@ -426,6 +426,11 @@ def delete_subscription(
             If this method raises an exception, Dify will still remove the subscription
             but display a warning message to the user.
 
+            If the subscription no longer exists on the external service (e.g., already
+            deleted or expired), this method should return `success=True`. This ensures
+            idempotent behavior, as the desired state (the subscription being absent)
+            is already met.
+
         Examples:
             Successful unsubscription:
             >>> subscription = Subscription(
diff --git a/python/examples/github_trigger/provider/github.py b/python/examples/github_trigger/provider/github.py
index ed28550b..d76aaa0f 100644
--- a/python/examples/github_trigger/provider/github.py
+++ b/python/examples/github_trigger/provider/github.py
@@ -338,10 +338,8 @@ def _delete_subscription(
             )
 
         if response.status_code == 404:
-            raise UnsubscribeError(
-                message=f"Webhook {external_id} not found in repository {repository}",
-                error_code="WEBHOOK_NOT_FOUND",
-                external_response=response.json(),
+            return UnsubscribeResult(
+                success=True, message=f"Webhook {external_id} not found in repository {repository}"
             )
 
         raise UnsubscribeError(