diff --git a/libs/standard-tests/langchain_tests/__init__.py b/libs/standard-tests/langchain_tests/__init__.py
index 0f41b67980c..3ed49369923 100644
--- a/libs/standard-tests/langchain_tests/__init__.py
+++ b/libs/standard-tests/langchain_tests/__init__.py
@@ -1,5 +1,4 @@
-"""
-Base Test classes for standard testing.
+"""Base Test classes for standard testing.
 
 To learn how to use these classes, see the
 `Integration standard testing <https://python.langchain.com/docs/contributing/how_to/integrations/standard_tests/>`_
diff --git a/libs/standard-tests/langchain_tests/base.py b/libs/standard-tests/langchain_tests/base.py
index 8e9a0533abf..bc262b31c19 100644
--- a/libs/standard-tests/langchain_tests/base.py
+++ b/libs/standard-tests/langchain_tests/base.py
@@ -2,13 +2,10 @@ from abc import ABC
 
 
 class BaseStandardTests(ABC):
-    """
-    :private:
-    """
+    """:private:"""
 
     def test_no_overrides_DO_NOT_OVERRIDE(self) -> None:
-        """
-        Test that no standard tests are overridden.
+        """Test that no standard tests are overridden.
 
         :private:
         """
@@ -22,10 +19,11 @@ class BaseStandardTests(ABC):
                     if comparison_class is None:
                         comparison_class = base
                     else:
-                        raise ValueError(
+                        msg = (
                             "Multiple standard test base classes found: "
                             f"{comparison_class}, {base}"
                         )
+                        raise ValueError(msg)
                 else:
                     explore_bases(base)
 
@@ -34,12 +32,10 @@ class BaseStandardTests(ABC):
 
         print(f"Comparing {self.__class__} to {comparison_class}")  # noqa: T201
 
-        running_tests = set(
-            [method for method in dir(self) if method.startswith("test_")]
-        )
-        base_tests = set(
-            [method for method in dir(comparison_class) if method.startswith("test_")]
-        )
+        running_tests = {method for method in dir(self) if method.startswith("test_")}
+        base_tests = {
+            method for method in dir(comparison_class) if method.startswith("test_")
+        }
         deleted_tests = base_tests - running_tests
         assert not deleted_tests, f"Standard tests deleted: {deleted_tests}"
 
diff --git a/libs/standard-tests/langchain_tests/conftest.py b/libs/standard-tests/langchain_tests/conftest.py
index 9df423c5c2a..6ef0ce74638 100644
--- a/libs/standard-tests/langchain_tests/conftest.py
+++ b/libs/standard-tests/langchain_tests/conftest.py
@@ -52,9 +52,8 @@ class CustomPersister:
         # If cassette path is already Path this is a no-op
         cassette_path = Path(cassette_path)
         if not cassette_path.is_file():
-            raise CassetteNotFoundError(
-                f"Cassette file {cassette_path} does not exist."
-            )
+            msg = f"Cassette file {cassette_path} does not exist."
+            raise CassetteNotFoundError(msg)
         with cassette_path.open(mode="rb") as f:
             data = f.read()
         deser = serializer.deserialize(data)
diff --git a/libs/standard-tests/langchain_tests/integration_tests/__init__.py b/libs/standard-tests/langchain_tests/integration_tests/__init__.py
index b6f0a1b0f2a..fbe4888d1e5 100644
--- a/libs/standard-tests/langchain_tests/integration_tests/__init__.py
+++ b/libs/standard-tests/langchain_tests/integration_tests/__init__.py
@@ -26,13 +26,13 @@ from .tools import ToolsIntegrationTests
 from .vectorstores import VectorStoreIntegrationTests
 
 __all__ = [
-    "ChatModelIntegrationTests",
-    "EmbeddingsIntegrationTests",
-    "ToolsIntegrationTests",
+    "AsyncCacheTestSuite",
     "BaseStoreAsyncTests",
     "BaseStoreSyncTests",
-    "AsyncCacheTestSuite",
-    "SyncCacheTestSuite",
-    "VectorStoreIntegrationTests",
+    "ChatModelIntegrationTests",
+    "EmbeddingsIntegrationTests",
     "RetrieversIntegrationTests",
+    "SyncCacheTestSuite",
+    "ToolsIntegrationTests",
+    "VectorStoreIntegrationTests",
 ]
diff --git a/libs/standard-tests/langchain_tests/integration_tests/base_store.py b/libs/standard-tests/langchain_tests/integration_tests/base_store.py
index 0b04104de34..31daa8c2307 100644
--- a/libs/standard-tests/langchain_tests/integration_tests/base_store.py
+++ b/libs/standard-tests/langchain_tests/integration_tests/base_store.py
@@ -1,5 +1,4 @@
-"""
-Standard tests for the BaseStore abstraction
+"""Standard tests for the BaseStore abstraction.
 
 We don't recommend implementing externally managed BaseStore abstractions at this time.
 
@@ -38,10 +37,9 @@ class BaseStoreSyncTests(BaseStandardTests, Generic[V]):
         """
 
     @abstractmethod
-    @pytest.fixture()
+    @pytest.fixture
     def three_values(self) -> tuple[V, V, V]:
         """Three example values that will be used in the tests."""
-        pass
 
     def test_three_values(self, three_values: tuple[V, V, V]) -> None:
         """Test that the fixture provides three values."""
@@ -169,10 +167,9 @@ class BaseStoreAsyncTests(BaseStandardTests, Generic[V]):
         """
 
     @abstractmethod
-    @pytest.fixture()
+    @pytest.fixture
     def three_values(self) -> tuple[V, V, V]:
         """Three example values that will be used in the tests."""
-        pass
 
     async def test_three_values(self, three_values: tuple[V, V, V]) -> None:
         """Test that the fixture provides three values."""
diff --git a/libs/standard-tests/langchain_tests/integration_tests/cache.py b/libs/standard-tests/langchain_tests/integration_tests/cache.py
index 3d04731d16a..8856ff3bf69 100644
--- a/libs/standard-tests/langchain_tests/integration_tests/cache.py
+++ b/libs/standard-tests/langchain_tests/integration_tests/cache.py
@@ -1,5 +1,4 @@
-"""
-Standard tests for the BaseCache abstraction
+"""Standard tests for the BaseCache abstraction.
 
 We don't recommend implementing externally managed BaseCache abstractions at this time.
 
diff --git a/libs/standard-tests/langchain_tests/integration_tests/chat_models.py b/libs/standard-tests/langchain_tests/integration_tests/chat_models.py
index b9f58010f60..fa05d08927a 100644
--- a/libs/standard-tests/langchain_tests/integration_tests/chat_models.py
+++ b/libs/standard-tests/langchain_tests/integration_tests/chat_models.py
@@ -41,9 +41,7 @@ from langchain_tests.utils.pydantic import PYDANTIC_MAJOR_VERSION
 def _get_joke_class(
     schema_type: Literal["pydantic", "typeddict", "json_schema"],
 ) -> Any:
-    """
-    :private:
-    """
+    """:private:"""
 
     class Joke(BaseModel):
         """Joke to tell user."""
@@ -61,18 +59,18 @@ def _get_joke_class(
         punchline: Annotated[str, ..., "answer to resolve the joke"]
 
     def validate_joke_dict(result: Any) -> bool:
-        return all(key in ["setup", "punchline"] for key in result.keys())
+        return all(key in ["setup", "punchline"] for key in result)
 
     if schema_type == "pydantic":
         return Joke, validate_joke
 
-    elif schema_type == "typeddict":
+    if schema_type == "typeddict":
         return JokeDict, validate_joke_dict
 
-    elif schema_type == "json_schema":
+    if schema_type == "json_schema":
         return Joke.model_json_schema(), validate_joke_dict
-    else:
-        raise ValueError("Invalid schema type")
+    msg = "Invalid schema type"
+    raise ValueError(msg)
 
 
 class _TestCallbackHandler(BaseCallbackHandler):
@@ -879,8 +877,7 @@ class ChatModelIntegrationTests(ChatModelTests):
         assert len(result.content) > 0
 
     def test_double_messages_conversation(self, model: BaseChatModel) -> None:
-        """
-        Test to verify that the model can handle double-message conversations.
+        """Test to verify that the model can handle double-message conversations.
 
         This should pass for all integrations. Tests the model's ability to process
         a sequence of double-system, double-human, and double-ai messages as context
@@ -1083,7 +1080,8 @@ class ChatModelIntegrationTests(ChatModelTests):
             assert usage_metadata.get("input_tokens", 0) >= total_detailed_tokens
 
     def test_usage_metadata_streaming(self, model: BaseChatModel) -> None:
-        """
+        """Test usage metadata in streaming mode.
+
         Test to verify that the model returns correct usage metadata in streaming mode.
 
         .. versionchanged:: 0.3.17
@@ -1193,7 +1191,7 @@ class ChatModelIntegrationTests(ChatModelTests):
                     "Only one chunk should set input_tokens,"
                     " the rest should be 0 or None"
                 )
-            full = chunk if full is None else cast(AIMessageChunk, full + chunk)
+            full = chunk if full is None else cast("AIMessageChunk", full + chunk)
 
         assert isinstance(full, AIMessageChunk)
         assert full.usage_metadata is not None
@@ -1261,7 +1259,7 @@ class ChatModelIntegrationTests(ChatModelTests):
                     run_manager: Optional[CallbackManagerForLLMRun] = None,
                     **kwargs: Any,
                 ) -> ChatResult:
-        """  # noqa: E501
+        """
         result = model.invoke("hi", stop=["you"])
         assert isinstance(result, AIMessage)
 
@@ -1315,10 +1313,7 @@ class ChatModelIntegrationTests(ChatModelTests):
         """
         if not self.has_tool_calling:
             pytest.skip("Test requires tool calling.")
-        if not self.has_tool_choice:
-            tool_choice_value = None
-        else:
-            tool_choice_value = "any"
+        tool_choice_value = None if not self.has_tool_choice else "any"
         # Emit warning if tool_choice_value property is overridden
         if inspect.getattr_static(
             self, "tool_choice_value"
@@ -1391,10 +1386,7 @@ class ChatModelIntegrationTests(ChatModelTests):
         """
         if not self.has_tool_calling:
             pytest.skip("Test requires tool calling.")
-        if not self.has_tool_choice:
-            tool_choice_value = None
-        else:
-            tool_choice_value = "any"
+        tool_choice_value = None if not self.has_tool_choice else "any"
         model_with_tools = model.bind_tools(
             [magic_function], tool_choice=tool_choice_value
         )
@@ -1730,10 +1722,7 @@ class ChatModelIntegrationTests(ChatModelTests):
         """  # noqa: E501
         if not self.has_tool_calling:
             pytest.skip("Test requires tool calling.")
-        if not self.has_tool_choice:
-            tool_choice_value = None
-        else:
-            tool_choice_value = "any"
+        tool_choice_value = None if not self.has_tool_choice else "any"
         model_with_tools = model.bind_tools(
             [magic_function_no_args], tool_choice=tool_choice_value
         )
@@ -1856,14 +1845,15 @@ class ChatModelIntegrationTests(ChatModelTests):
                 @pytest.mark.xfail(reason=("Not implemented."))
                 def test_structured_few_shot_examples(self, *args: Any) -> None:
                     super().test_structured_few_shot_examples(*args)
-        """  # noqa: E501
+        """
         if not self.has_tool_calling:
             pytest.skip("Test requires tool calling.")
         model_with_tools = model.bind_tools([my_adder_tool], tool_choice="any")
         function_result = json.dumps({"result": 3})
 
         tool_schema = my_adder_tool.args_schema
-        assert isinstance(tool_schema, type) and issubclass(tool_schema, BaseModel)
+        assert isinstance(tool_schema, type)
+        assert issubclass(tool_schema, BaseModel)
         few_shot_messages = tool_example_to_messages(
             "What is 1 + 2",
             [tool_schema(a=1, b=2)],
@@ -1871,7 +1861,7 @@ class ChatModelIntegrationTests(ChatModelTests):
             ai_response=function_result,
         )
 
-        messages = few_shot_messages + [HumanMessage("What is 3 + 4")]
+        messages = [*few_shot_messages, HumanMessage("What is 3 + 4")]
         result = model_with_tools.invoke(messages)
         assert isinstance(result, AIMessage)
 
@@ -1905,7 +1895,7 @@ class ChatModelIntegrationTests(ChatModelTests):
             most formats: https://python.langchain.com/api_reference/core/utils/langchain_core.utils.function_calling.convert_to_openai_tool.html
 
             See example implementation of ``with_structured_output`` here: https://python.langchain.com/api_reference/_modules/langchain_openai/chat_models/base.html#BaseChatOpenAI.with_structured_output
-        """  # noqa: E501
+        """
         if not self.has_structured_output:
             pytest.skip("Test requires structured output.")
 
@@ -1983,7 +1973,7 @@ class ChatModelIntegrationTests(ChatModelTests):
             most formats: https://python.langchain.com/api_reference/core/utils/langchain_core.utils.function_calling.convert_to_openai_tool.html
 
             See example implementation of ``with_structured_output`` here: https://python.langchain.com/api_reference/_modules/langchain_openai/chat_models/base.html#BaseChatOpenAI.with_structured_output
-        """  # noqa: E501
+        """
         if not self.has_structured_output:
             pytest.skip("Test requires structured output.")
 
@@ -2163,7 +2153,7 @@ class ChatModelIntegrationTests(ChatModelTests):
         assert isinstance(result, dict)
 
     def test_json_mode(self, model: BaseChatModel) -> None:
-        """Test structured output via `JSON mode. <https://python.langchain.com/docs/concepts/structured_outputs/#json-mode>`_
+        """Test structured output via `JSON mode. <https://python.langchain.com/docs/concepts/structured_outputs/#json-mode>`_.
 
         This test is optional and should be skipped if the model does not support
         the JSON mode feature (see Configuration below).
@@ -2183,7 +2173,7 @@ class ChatModelIntegrationTests(ChatModelTests):
         .. dropdown:: Troubleshooting
 
             See example implementation of ``with_structured_output`` here: https://python.langchain.com/api_reference/_modules/langchain_openai/chat_models/base.html#BaseChatOpenAI.with_structured_output
-        """  # noqa: E501
+        """
         if not self.supports_json_mode:
             pytest.skip("Test requires json mode support.")
 
@@ -2893,20 +2883,20 @@ class ChatModelIntegrationTests(ChatModelTests):
 
     def invoke_with_audio_input(self, *, stream: bool = False) -> AIMessage:
         """:private:"""
-        raise NotImplementedError()
+        raise NotImplementedError
 
     def invoke_with_audio_output(self, *, stream: bool = False) -> AIMessage:
         """:private:"""
-        raise NotImplementedError()
+        raise NotImplementedError
 
     def invoke_with_reasoning_output(self, *, stream: bool = False) -> AIMessage:
         """:private:"""
-        raise NotImplementedError()
+        raise NotImplementedError
 
     def invoke_with_cache_read_input(self, *, stream: bool = False) -> AIMessage:
         """:private:"""
-        raise NotImplementedError()
+        raise NotImplementedError
 
     def invoke_with_cache_creation_input(self, *, stream: bool = False) -> AIMessage:
         """:private:"""
-        raise NotImplementedError()
+        raise NotImplementedError
diff --git a/libs/standard-tests/langchain_tests/integration_tests/indexer.py b/libs/standard-tests/langchain_tests/integration_tests/indexer.py
index 9d95ac9ee11..aec380935bf 100644
--- a/libs/standard-tests/langchain_tests/integration_tests/indexer.py
+++ b/libs/standard-tests/langchain_tests/integration_tests/indexer.py
@@ -31,7 +31,7 @@ class DocumentIndexerTestSuite(ABC):
         """Get the index."""
 
     def test_upsert_documents_has_no_ids(self, index: DocumentIndex) -> None:
-        """Verify that there is not parameter called ids in upsert"""
+        """Verify that there is not parameter called ids in upsert."""
         signature = inspect.signature(index.upsert)
         assert "ids" not in signature.parameters
 
@@ -75,7 +75,7 @@ class DocumentIndexerTestSuite(ABC):
         ]
         response = index.upsert(documents)
         ids = response["succeeded"]
-        other_id = list(set(ids) - {foo_uuid})[0]
+        other_id = next(iter(set(ids) - {foo_uuid}))
         assert response["failed"] == []
         assert foo_uuid in ids
         # Ordering is not guaranteed, so we use a set.
@@ -221,7 +221,7 @@ class AsyncDocumentIndexTestSuite(ABC):
         """Get the index."""
 
     async def test_upsert_documents_has_no_ids(self, index: DocumentIndex) -> None:
-        """Verify that there is not parameter called ids in upsert"""
+        """Verify that there is not parameter called ids in upsert."""
         signature = inspect.signature(index.upsert)
         assert "ids" not in signature.parameters
 
@@ -265,7 +265,7 @@ class AsyncDocumentIndexTestSuite(ABC):
         ]
         response = await index.aupsert(documents)
         ids = response["succeeded"]
-        other_id = list(set(ids) - {foo_uuid})[0]
+        other_id = next(iter(set(ids) - {foo_uuid}))
         assert response["failed"] == []
         assert foo_uuid in ids
         # Ordering is not guaranteed, so we use a set.
diff --git a/libs/standard-tests/langchain_tests/integration_tests/retrievers.py b/libs/standard-tests/langchain_tests/integration_tests/retrievers.py
index 2a36447a65a..10687efc399 100644
--- a/libs/standard-tests/langchain_tests/integration_tests/retrievers.py
+++ b/libs/standard-tests/langchain_tests/integration_tests/retrievers.py
@@ -8,43 +8,32 @@ from langchain_tests.base import BaseStandardTests
 
 
 class RetrieversIntegrationTests(BaseStandardTests):
-    """
-    Base class for retrievers integration tests.
-    """
+    """Base class for retrievers integration tests."""
 
     @property
     @abstractmethod
     def retriever_constructor(self) -> type[BaseRetriever]:
-        """
-        A BaseRetriever subclass to be tested.
-        """
+        """A BaseRetriever subclass to be tested."""
         ...
 
     @property
     def retriever_constructor_params(self) -> dict:
-        """
-        Returns a dictionary of parameters to pass to the retriever constructor.
-        """
+        """Returns a dictionary of parameters to pass to the retriever constructor."""
         return {}
 
     @property
     @abstractmethod
     def retriever_query_example(self) -> str:
-        """
-        Returns a str representing the "query" of an example retriever call.
-        """
+        """Returns a str representing the "query" of an example retriever call."""
         ...
 
     @pytest.fixture
     def retriever(self) -> BaseRetriever:
-        """
-        :private:
-        """
+        """:private:"""
         return self.retriever_constructor(**self.retriever_constructor_params)
 
     def test_k_constructor_param(self) -> None:
-        """
-        Test that the retriever constructor accepts a k parameter, representing
+        """Test that the retriever constructor accepts a k parameter, representing
         the number of documents to return.
 
         .. dropdown:: Troubleshooting
@@ -77,8 +66,7 @@ class RetrieversIntegrationTests(BaseStandardTests):
         assert all(isinstance(doc, Document) for doc in result_1)
 
     def test_invoke_with_k_kwarg(self, retriever: BaseRetriever) -> None:
-        """
-        Test that the invoke method accepts a k parameter, representing the number of
+        """Test that the invoke method accepts a k parameter, representing the number of
         documents to return.
 
         .. dropdown:: Troubleshooting
@@ -104,8 +92,7 @@ class RetrieversIntegrationTests(BaseStandardTests):
         assert all(isinstance(doc, Document) for doc in result_3)
 
     def test_invoke_returns_documents(self, retriever: BaseRetriever) -> None:
-        """
-        If invoked with the example params, the retriever should return a list of
+        """If invoked with the example params, the retriever should return a list of
         Documents.
 
         .. dropdown:: Troubleshooting
@@ -120,8 +107,7 @@ class RetrieversIntegrationTests(BaseStandardTests):
         assert all(isinstance(doc, Document) for doc in result)
 
     async def test_ainvoke_returns_documents(self, retriever: BaseRetriever) -> None:
-        """
-        If ainvoked with the example params, the retriever should return a list of
+        """If ainvoked with the example params, the retriever should return a list of
         Documents.
 
         See :meth:`test_invoke_returns_documents` for more information on
diff --git a/libs/standard-tests/langchain_tests/integration_tests/tools.py b/libs/standard-tests/langchain_tests/integration_tests/tools.py
index 86a26338ed9..e21772b8928 100644
--- a/libs/standard-tests/langchain_tests/integration_tests/tools.py
+++ b/libs/standard-tests/langchain_tests/integration_tests/tools.py
@@ -5,12 +5,11 @@ from langchain_tests.unit_tests.tools import ToolsTests
 
 
 class ToolsIntegrationTests(ToolsTests):
-    """
-    Base class for tools integration tests.
-    """
+    """Base class for tools integration tests."""
 
     def test_invoke_matches_output_schema(self, tool: BaseTool) -> None:
-        """
+        """Test invoke matches output schema.
+
         If invoked with a ToolCall, the tool should return a valid ToolMessage content.
 
         If you have followed the `custom tool guide <https://python.langchain.com/docs/how_to/custom_tools/>`_,
@@ -41,7 +40,8 @@ class ToolsIntegrationTests(ToolsTests):
             assert all(isinstance(c, (str, dict)) for c in tool_message.content)
 
     async def test_async_invoke_matches_output_schema(self, tool: BaseTool) -> None:
-        """
+        """Test async invoke matches output schema.
+
         If ainvoked with a ToolCall, the tool should return a valid ToolMessage content.
 
         For debugging tips, see :meth:`test_invoke_matches_output_schema`.
@@ -66,9 +66,8 @@ class ToolsIntegrationTests(ToolsTests):
             assert all(isinstance(c, (str, dict)) for c in tool_message.content)
 
     def test_invoke_no_tool_call(self, tool: BaseTool) -> None:
-        """
-        If invoked without a ToolCall, the tool can return anything
-        but it shouldn't throw an error
+        """If invoked without a ToolCall, the tool can return anything
+        but it shouldn't throw an error.
 
         If this test fails, your tool may not be handling the input you defined
         in `tool_invoke_params_example` correctly, and it's throwing an error.
@@ -79,9 +78,8 @@ class ToolsIntegrationTests(ToolsTests):
         tool.invoke(self.tool_invoke_params_example)
 
     async def test_async_invoke_no_tool_call(self, tool: BaseTool) -> None:
-        """
-        If ainvoked without a ToolCall, the tool can return anything
-        but it shouldn't throw an error
+        """If ainvoked without a ToolCall, the tool can return anything
+        but it shouldn't throw an error.
 
         For debugging tips, see :meth:`test_invoke_no_tool_call`.
         """
diff --git a/libs/standard-tests/langchain_tests/integration_tests/vectorstores.py b/libs/standard-tests/langchain_tests/integration_tests/vectorstores.py
index 6b8d8d1d565..84f4e57a37f 100644
--- a/libs/standard-tests/langchain_tests/integration_tests/vectorstores.py
+++ b/libs/standard-tests/langchain_tests/integration_tests/vectorstores.py
@@ -105,16 +105,12 @@ class VectorStoreIntegrationTests(BaseStandardTests):
 
     @property
     def has_sync(self) -> bool:
-        """
-        Configurable property to enable or disable sync tests.
-        """
+        """Configurable property to enable or disable sync tests."""
         return True
 
     @property
     def has_async(self) -> bool:
-        """
-        Configurable property to enable or disable async tests.
-        """
+        """Configurable property to enable or disable async tests."""
         return True
 
     @staticmethod
@@ -368,7 +364,7 @@ class VectorStoreIntegrationTests(BaseStandardTests):
                     @pytest.mark.xfail(reason=("get_by_ids not implemented."))
                     def test_get_by_ids_missing(self, vectorstore: VectorStore) -> None:
                         super().test_get_by_ids_missing(vectorstore)
-        """  # noqa: E501
+        """
         if not self.has_sync:
             pytest.skip("Sync tests not supported.")
 
diff --git a/libs/standard-tests/langchain_tests/unit_tests/chat_models.py b/libs/standard-tests/langchain_tests/unit_tests/chat_models.py
index 24b2cfc2710..1b746c4c541 100644
--- a/libs/standard-tests/langchain_tests/unit_tests/chat_models.py
+++ b/libs/standard-tests/langchain_tests/unit_tests/chat_models.py
@@ -1,6 +1,4 @@
-"""
-:autodoc-options: autoproperty
-"""
+""":autodoc-options: autoproperty."""
 
 import inspect
 import os
@@ -31,13 +29,13 @@ from langchain_tests.utils.pydantic import PYDANTIC_MAJOR_VERSION
 
 
 def generate_schema_pydantic_v1_from_2() -> Any:
-    """
-    Use to generate a schema from v1 namespace in pydantic 2.
+    """Use to generate a schema from v1 namespace in pydantic 2.
 
     :private:
     """
     if PYDANTIC_MAJOR_VERSION != 2:
-        raise AssertionError("This function is only compatible with Pydantic v2.")
+        msg = "This function is only compatible with Pydantic v2."
+        raise AssertionError(msg)
 
     class PersonB(BaseModelV1):
         """Record attributes of a person."""
@@ -49,8 +47,7 @@ def generate_schema_pydantic_v1_from_2() -> Any:
 
 
 def generate_schema_pydantic() -> Any:
-    """
-    Works with either pydantic 1 or 2
+    """Works with either pydantic 1 or 2.
 
     :private:
     """
@@ -74,7 +71,7 @@ class ChatModelTests(BaseStandardTests):
     """Base class for chat model tests.
 
     :private:
-    """  # noqa: E501
+    """
 
     @property
     @abstractmethod
@@ -158,13 +155,15 @@ class ChatModelTests(BaseStandardTests):
     @property
     def supports_image_inputs(self) -> bool:
         """(bool) whether the chat model supports image inputs, defaults to
-        ``False``."""
+        ``False``.
+        """
         return False
 
     @property
     def supports_image_urls(self) -> bool:
         """(bool) whether the chat model supports image inputs from URLs, defaults to
-        ``False``."""
+        ``False``.
+        """
         return False
 
     @property
@@ -175,19 +174,22 @@ class ChatModelTests(BaseStandardTests):
     @property
     def supports_audio_inputs(self) -> bool:
         """(bool) whether the chat model supports audio inputs, defaults to
-        ``False``."""
+        ``False``.
+        """
         return False
 
     @property
     def supports_video_inputs(self) -> bool:
         """(bool) whether the chat model supports video inputs, defaults to ``False``.
-        No current tests are written for this feature."""
+        No current tests are written for this feature.
+        """
         return False
 
     @property
     def returns_usage_metadata(self) -> bool:
         """(bool) whether the chat model returns usage metadata on invoke and streaming
-        responses."""
+        responses.
+        """
         return True
 
     @property
@@ -198,7 +200,8 @@ class ChatModelTests(BaseStandardTests):
     @property
     def supports_image_tool_message(self) -> bool:
         """(bool) whether the chat model supports ToolMessages that include image
-        content."""
+        content.
+        """
         return False
 
     @property
@@ -227,7 +230,8 @@ class ChatModelTests(BaseStandardTests):
         ],
     ]:
         """(dict) what usage metadata details are emitted in invoke and stream. Only
-        needs to be overridden if these details are returned by the model."""
+        needs to be overridden if these details are returned by the model.
+        """
         return {"invoke": [], "stream": []}
 
 
@@ -806,7 +810,8 @@ class ChatModelUnitTests(ChatModelTests):
     @property
     def init_from_env_params(self) -> tuple[dict, dict, dict]:
         """(tuple) environment variables, additional initialization args, and expected
-        instance attributes for testing initialization from environment variables."""
+        instance attributes for testing initialization from environment variables.
+        """
         return {}, {}, {}
 
     def test_init(self) -> None:
@@ -887,7 +892,7 @@ class ChatModelUnitTests(ChatModelTests):
             a utility function that will accommodate most formats: https://python.langchain.com/api_reference/core/utils/langchain_core.utils.function_calling.convert_to_openai_tool.html
 
             See example implementation of ``bind_tools`` here: https://python.langchain.com/api_reference/_modules/langchain_openai/chat_models/base.html#BaseChatOpenAI.bind_tools
-        """  # noqa: E501
+        """
         if not self.has_tool_calling:
             return
 
@@ -927,7 +932,7 @@ class ChatModelUnitTests(ChatModelTests):
             a utility function that will accommodate most formats: https://python.langchain.com/api_reference/core/utils/langchain_core.utils.function_calling.convert_to_openai_tool.html
 
             See example implementation of ``with_structured_output`` here: https://python.langchain.com/api_reference/_modules/langchain_openai/chat_models/base.html#BaseChatOpenAI.with_structured_output
-        """  # noqa: E501
+        """
         if not self.has_structured_output:
             return
 
diff --git a/libs/standard-tests/langchain_tests/unit_tests/embeddings.py b/libs/standard-tests/langchain_tests/unit_tests/embeddings.py
index 9be7cae63ae..3428fd8041f 100644
--- a/libs/standard-tests/langchain_tests/unit_tests/embeddings.py
+++ b/libs/standard-tests/langchain_tests/unit_tests/embeddings.py
@@ -10,9 +10,7 @@ from langchain_tests.base import BaseStandardTests
 
 
 class EmbeddingsTests(BaseStandardTests):
-    """
-    :private:
-    """
+    """:private:"""
 
     @property
     @abstractmethod
@@ -88,7 +86,7 @@ class EmbeddingsUnitTests(EmbeddingsTests):
                             "my_api_key": "api_key",
                         },
                     )
-    """  # noqa: E501
+    """
 
     def test_init(self) -> None:
         """Test model initialization.
@@ -106,7 +104,8 @@ class EmbeddingsUnitTests(EmbeddingsTests):
         """This property is used in unit tests to test initialization from environment
         variables. It should return a tuple of three dictionaries that specify the
         environment variables, additional initialization args, and expected instance
-        attributes to check."""
+        attributes to check.
+        """
         return {}, {}, {}
 
     def test_init_from_env(self) -> None:
diff --git a/libs/standard-tests/langchain_tests/unit_tests/tools.py b/libs/standard-tests/langchain_tests/unit_tests/tools.py
index aa7828d647e..cbc40dc4121 100644
--- a/libs/standard-tests/langchain_tests/unit_tests/tools.py
+++ b/libs/standard-tests/langchain_tests/unit_tests/tools.py
@@ -11,8 +11,7 @@ from langchain_tests.base import BaseStandardTests
 
 
 class ToolsTests(BaseStandardTests):
-    """
-    :private:
+    """:private:
     Base class for testing tools. This won't show in the documentation, but
     the docstrings will be inherited by subclasses.
     """
@@ -20,22 +19,17 @@ class ToolsTests(BaseStandardTests):
     @property
     @abstractmethod
     def tool_constructor(self) -> Union[type[BaseTool], BaseTool]:
-        """
-        Returns a class or instance of a tool to be tested.
-        """
+        """Returns a class or instance of a tool to be tested."""
         ...
 
     @property
     def tool_constructor_params(self) -> dict:
-        """
-        Returns a dictionary of parameters to pass to the tool constructor.
-        """
+        """Returns a dictionary of parameters to pass to the tool constructor."""
         return {}
 
     @property
     def tool_invoke_params_example(self) -> dict:
-        """
-        Returns a dictionary representing the "args" of an example tool call.
+        """Returns a dictionary representing the "args" of an example tool call.
 
         This should NOT be a ToolCall dict - it should not
         have {"name", "id", "args"} keys.
@@ -44,9 +38,7 @@ class ToolsTests(BaseStandardTests):
 
     @pytest.fixture
     def tool(self) -> BaseTool:
-        """
-        :private:
-        """
+        """:private:"""
         if isinstance(self.tool_constructor, BaseTool):
             if self.tool_constructor_params != {}:
                 msg = (
@@ -59,19 +51,17 @@ class ToolsTests(BaseStandardTests):
 
 
 class ToolsUnitTests(ToolsTests):
-    """
-    Base class for tools unit tests.
-    """
+    """Base class for tools unit tests."""
 
     @property
     def init_from_env_params(self) -> tuple[dict, dict, dict]:
         """Return env vars, init args, and expected instance attrs for initializing
-        from env vars."""
+        from env vars.
+        """
         return {}, {}, {}
 
     def test_init(self) -> None:
-        """
-        Test that the tool can be initialized with :attr:`tool_constructor` and
+        """Test that the tool can be initialized with :attr:`tool_constructor` and
         :attr:`tool_constructor_params`. If this fails, check that the
         keyword args defined in :attr:`tool_constructor_params` are valid.
         """
@@ -94,16 +84,14 @@ class ToolsUnitTests(ToolsTests):
                 assert actual == expected
 
     def test_has_name(self, tool: BaseTool) -> None:
-        """
-        Tests that the tool has a name attribute to pass to chat models.
+        """Tests that the tool has a name attribute to pass to chat models.
 
         If this fails, add a `name` parameter to your tool.
         """
         assert tool.name
 
     def test_has_input_schema(self, tool: BaseTool) -> None:
-        """
-        Tests that the tool has an input schema.
+        """Tests that the tool has an input schema.
 
         If this fails, add an `args_schema` to your tool.
 
@@ -115,8 +103,7 @@ class ToolsUnitTests(ToolsTests):
         assert tool.get_input_schema()
 
     def test_input_schema_matches_invoke_params(self, tool: BaseTool) -> None:
-        """
-        Tests that the provided example params match the declared input schema.
+        """Tests that the provided example params match the declared input schema.
 
         If this fails, update the `tool_invoke_params_example` attribute to match
         the input schema (`args_schema`) of the tool.
diff --git a/libs/standard-tests/langchain_tests/utils/pydantic.py b/libs/standard-tests/langchain_tests/utils/pydantic.py
index 52720bbd081..34cfce3c2ab 100644
--- a/libs/standard-tests/langchain_tests/utils/pydantic.py
+++ b/libs/standard-tests/langchain_tests/utils/pydantic.py
@@ -1,5 +1,4 @@
-"""
-Utilities for working with pydantic models.
+"""Utilities for working with pydantic models.
 
 :private:
 """
diff --git a/libs/standard-tests/tests/integration_tests/test_compile.py b/libs/standard-tests/tests/integration_tests/test_compile.py
index 33ecccdfa0f..f315e45f521 100644
--- a/libs/standard-tests/tests/integration_tests/test_compile.py
+++ b/libs/standard-tests/tests/integration_tests/test_compile.py
@@ -4,4 +4,3 @@ import pytest
 @pytest.mark.compile
 def test_placeholder() -> None:
     """Used for compiling integration tests without running any real tests."""
-    pass
diff --git a/libs/standard-tests/tests/unit_tests/test_basic_tool.py b/libs/standard-tests/tests/unit_tests/test_basic_tool.py
index 8af2750a9d1..1439e414316 100644
--- a/libs/standard-tests/tests/unit_tests/test_basic_tool.py
+++ b/libs/standard-tests/tests/unit_tests/test_basic_tool.py
@@ -41,8 +41,7 @@ class TestParrotMultiplyToolUnit(ToolsUnitTests):
 
     @property
     def tool_invoke_params_example(self) -> dict:
-        """
-        Returns a dictionary representing the "args" of an example tool call.
+        """Returns a dictionary representing the "args" of an example tool call.
 
         This should NOT be a ToolCall dict - i.e. it should not
         have {"name", "id", "args"} keys.
@@ -64,8 +63,7 @@ class TestParrotMultiplyToolIntegration(ToolsIntegrationTests):
 
     @property
     def tool_invoke_params_example(self) -> dict:
-        """
-        Returns a dictionary representing the "args" of an example tool call.
+        """Returns a dictionary representing the "args" of an example tool call.
 
         This should NOT be a ToolCall dict - i.e. it should not
         have {"name", "id", "args"} keys.
@@ -87,8 +85,7 @@ class TestParrotMultiplyArtifactToolIntegration(ToolsIntegrationTests):
 
     @property
     def tool_invoke_params_example(self) -> dict:
-        """
-        Returns a dictionary representing the "args" of an example tool call.
+        """Returns a dictionary representing the "args" of an example tool call.
 
         This should NOT be a ToolCall dict - i.e. it should not
         have {"name", "id", "args"} keys.
diff --git a/libs/standard-tests/tests/unit_tests/test_custom_chat_model.py b/libs/standard-tests/tests/unit_tests/test_custom_chat_model.py
index 4c9e1581e05..00371d24ca0 100644
--- a/libs/standard-tests/tests/unit_tests/test_custom_chat_model.py
+++ b/libs/standard-tests/tests/unit_tests/test_custom_chat_model.py
@@ -1,6 +1,4 @@
-"""
-Test the standard tests on the custom chat model in the docs
-"""
+"""Test the standard tests on the custom chat model in the docs."""
 
 from langchain_tests.integration_tests import ChatModelIntegrationTests
 from langchain_tests.unit_tests import ChatModelUnitTests
diff --git a/libs/standard-tests/tests/unit_tests/test_decorated_tool.py b/libs/standard-tests/tests/unit_tests/test_decorated_tool.py
index ecc8af3b00c..c3b7b89d04d 100644
--- a/libs/standard-tests/tests/unit_tests/test_decorated_tool.py
+++ b/libs/standard-tests/tests/unit_tests/test_decorated_tool.py
@@ -17,8 +17,7 @@ class TestParrotMultiplyToolUnit(ToolsUnitTests):
 
     @property
     def tool_invoke_params_example(self) -> dict:
-        """
-        Returns a dictionary representing the "args" of an example tool call.
+        """Returns a dictionary representing the "args" of an example tool call.
 
         This should NOT be a ToolCall dict - i.e. it should not
         have {"name", "id", "args"} keys.
@@ -33,8 +32,7 @@ class TestParrotMultiplyToolIntegration(ToolsIntegrationTests):
 
     @property
     def tool_invoke_params_example(self) -> dict:
-        """
-        Returns a dictionary representing the "args" of an example tool call.
+        """Returns a dictionary representing the "args" of an example tool call.
 
         This should NOT be a ToolCall dict - i.e. it should not
         have {"name", "id", "args"} keys.