diff --git a/libs/langchain/langchain/output_parsers/openai_tools.py b/libs/langchain/langchain/output_parsers/openai_tools.py
index 7e426f369f746..c03f4ad7afbc3 100644
--- a/libs/langchain/langchain/output_parsers/openai_tools.py
+++ b/libs/langchain/langchain/output_parsers/openai_tools.py
@@ -85,6 +85,7 @@ class JsonOutputKeyToolsParser(JsonOutputToolsParser):
 
     key_name: str
     """The type of tools to return."""
+
     def __init__(self, key_name: str, **kwargs: Any) -> None:
         """Allow init with positional args."""
         # Backwards compatibility for old argument name.