diff --git a/libs/core/langchain_core/callbacks/base.py b/libs/core/langchain_core/callbacks/base.py
index 0e0812989c5..c82d30a0766 100644
--- a/libs/core/langchain_core/callbacks/base.py
+++ b/libs/core/langchain_core/callbacks/base.py
@@ -1075,7 +1075,8 @@ Callbacks = Optional[Union[list[BaseCallbackHandler], BaseCallbackManager]]
 
 from typing_extensions import TypedDict
 
+
 class _ToolSchema(TypedDict):
     name: str
     description: str
-    parameters: dict
\ No newline at end of file
+    parameters: dict
diff --git a/libs/core/langchain_core/language_models/chat_models.py b/libs/core/langchain_core/language_models/chat_models.py
index fc994f2016f..9d34d62985f 100644
--- a/libs/core/langchain_core/language_models/chat_models.py
+++ b/libs/core/langchain_core/language_models/chat_models.py
@@ -272,7 +272,9 @@ class BaseChatModel(BaseLanguageModel[BaseMessage], ABC):
             )
             raise ValueError(msg)
 
-    def _standardize_tools(self, tools: Optional[Sequence]) -> Optional[List[_ToolSchema]]:
+    def _standardize_tools(
+        self, tools: Optional[Sequence]
+    ) -> Optional[List[_ToolSchema]]:
         """Convert tools to standard format for tracing."""
         if not tools:
             return tools
diff --git a/libs/core/langchain_core/tracers/langchain.py b/libs/core/langchain_core/tracers/langchain.py
index 8a26ee3e61c..2e07fccd03c 100644
--- a/libs/core/langchain_core/tracers/langchain.py
+++ b/libs/core/langchain_core/tracers/langchain.py
@@ -5,9 +5,10 @@ from __future__ import annotations
 import copy
 import logging
 import warnings
+from collections.abc import Sequence
 from concurrent.futures import ThreadPoolExecutor
 from datetime import datetime, timezone
-from typing import TYPE_CHECKING, Any, Optional, Union, Sequence
+from typing import TYPE_CHECKING, Any, Optional, Union
 from uuid import UUID
 
 from langsmith import Client