diff --git a/api/core/workflow/nodes/llm/node.py b/api/core/workflow/nodes/llm/node.py
index 05c1364a78..280f3e310d 100644
--- a/api/core/workflow/nodes/llm/node.py
+++ b/api/core/workflow/nodes/llm/node.py
@@ -1182,4 +1182,4 @@ def _handle_completion_template(
         contents=[TextPromptMessageContent(data=result_text)], role=PromptMessageRole.USER
     )
     prompt_messages.append(prompt_message)
-    return prompt_messages
\ No newline at end of file
+    return prompt_messages
diff --git a/api/tests/integration_tests/workflow/nodes/test_llm.py b/api/tests/integration_tests/workflow/nodes/test_llm.py
index 4f73fe6af9..da014c6a22 100644
--- a/api/tests/integration_tests/workflow/nodes/test_llm.py
+++ b/api/tests/integration_tests/workflow/nodes/test_llm.py
@@ -404,4 +404,4 @@ def test_execute_llm_with_thinking_tags(flask_req_ctx, thinking_tags_enabled, sh
                         assert "</think>" not in output_text
                         assert "Hello! How can I help you today?" in output_text
                         # Verify thinking content is not in output
-                        assert "Let me think about this greeting..." not in output_text
\ No newline at end of file
+                        assert "Let me think about this greeting..." not in output_text
diff --git a/api/tests/unit_tests/core/workflow/nodes/llm/test_node.py b/api/tests/unit_tests/core/workflow/nodes/llm/test_node.py
index 5b5332e611..79841f2b02 100644
--- a/api/tests/unit_tests/core/workflow/nodes/llm/test_node.py
+++ b/api/tests/unit_tests/core/workflow/nodes/llm/test_node.py
@@ -795,6 +795,7 @@ more context or rephrase your question? I'm here to help!"""
     def test_environment_variable_enabled(self):
         """Test that environment variable is properly read when enabled."""
         from core.workflow.nodes.llm.node import LLM_NODE_THINKING_TAGS_ENABLED
+
         assert LLM_NODE_THINKING_TAGS_ENABLED is True
 
     @mock.patch.dict("os.environ", {"LLM_NODE_THINKING_TAGS_ENABLED": "false"})
@@ -802,13 +803,17 @@ more context or rephrase your question? I'm here to help!"""
         """Test that environment variable is properly read when disabled."""
         # Need to reimport to get the updated value
         import importlib
+
         import core.workflow.nodes.llm.node
+
         importlib.reload(core.workflow.nodes.llm.node)
         from core.workflow.nodes.llm.node import LLM_NODE_THINKING_TAGS_ENABLED
+
         assert LLM_NODE_THINKING_TAGS_ENABLED is False
 
     def test_environment_variable_default(self):
         """Test that environment variable defaults to True."""
         from core.workflow.nodes.llm.node import LLM_NODE_THINKING_TAGS_ENABLED
+
         # Default should be True for backward compatibility
         assert LLM_NODE_THINKING_TAGS_ENABLED is True