diff --git a/cockpit/chat/a2ui/python/src/graph.py b/cockpit/chat/a2ui/python/src/graph.py
index 2d3b0616c..30a571169 100644
--- a/cockpit/chat/a2ui/python/src/graph.py
+++ b/cockpit/chat/a2ui/python/src/graph.py
@@ -66,7 +66,7 @@
              "action": {"event": {"name": "formSubmit", "context": {"formId": "contact"}}}},
         ],
     }}),
-])
+]) + "\n"  # Trailing newline required — parser processes at \n boundaries
 
 
 def build_a2ui_graph():
diff --git a/cockpit/langgraph/streaming/python/src/a2ui_graph.py b/cockpit/langgraph/streaming/python/src/a2ui_graph.py
index 2d3b0616c..30a571169 100644
--- a/cockpit/langgraph/streaming/python/src/a2ui_graph.py
+++ b/cockpit/langgraph/streaming/python/src/a2ui_graph.py
@@ -66,7 +66,7 @@
              "action": {"event": {"name": "formSubmit", "context": {"formId": "contact"}}}},
         ],
     }}),
-])
+]) + "\n"  # Trailing newline required — parser processes at \n boundaries
 
 
 def build_a2ui_graph():