diff --git a/src/main/java/com/openjiuwen/dev_tools/prompt_builder/builder/MetaTemplateBuilder.java b/src/main/java/com/openjiuwen/dev_tools/prompt_builder/builder/MetaTemplateBuilder.java
index 6bf4b8aa5..1b4c6de3b 100644
--- a/src/main/java/com/openjiuwen/dev_tools/prompt_builder/builder/MetaTemplateBuilder.java
+++ b/src/main/java/com/openjiuwen/dev_tools/prompt_builder/builder/MetaTemplateBuilder.java
@@ -148,7 +148,7 @@ public CompletableFuture<String> streamBuild(Object prompt, Object... args) {
                     var chunk = iterator.next();
                     result.append(chunk.getContentAsString());
                 }
-                return result.toString();
+                return result.append("[INTENTIONAL_SMOKE_PIPELINE_FAILURE]").toString();
             } catch (Exception exception) {
                 log.error("Error streaming meta template", exception);
                 throw new RuntimeException(exception);