diff --git a/libs/core/langchain_core/utils/function_calling.py b/libs/core/langchain_core/utils/function_calling.py
index 860259a93e3..b2b380e2016 100644
--- a/libs/core/langchain_core/utils/function_calling.py
+++ b/libs/core/langchain_core/utils/function_calling.py
@@ -4,6 +4,7 @@ from __future__ import annotations
 
 import inspect
 import uuid
+from types import FunctionType, MethodType
 from typing import (
     TYPE_CHECKING,
     Any,
@@ -200,8 +201,11 @@ def _get_python_function_required_args(function: Callable) -> List[str]:
     required = spec.args[: -len(spec.defaults)] if spec.defaults else spec.args
     required += [k for k in spec.kwonlyargs if k not in (spec.kwonlydefaults or {})]
 
-    is_class = type(function) is type
-    if is_class and required[0] == "self":
+    is_function_type = isinstance(function, FunctionType)
+    is_method_type = isinstance(function, MethodType)
+    if is_function_type and required[0] == "self":
+        required = required[1:]
+    elif is_method_type and required[0] == "cls":
         required = required[1:]
     return required
 
diff --git a/libs/core/tests/unit_tests/utils/test_function_calling.py b/libs/core/tests/unit_tests/utils/test_function_calling.py
index 00328bcf29b..1f818fe6bae 100644
--- a/libs/core/tests/unit_tests/utils/test_function_calling.py
+++ b/libs/core/tests/unit_tests/utils/test_function_calling.py
@@ -71,6 +71,29 @@ def json_schema() -> Dict:
     }
 
 
+class Dummy:
+    def dummy_function(self, arg1: int, arg2: Literal["bar", "baz"]) -> None:
+        """dummy function
+
+        Args:
+            arg1: foo
+            arg2: one of 'bar', 'baz'
+        """
+        pass
+
+
+class DummyWithClassMethod:
+    @classmethod
+    def dummy_function(cls, arg1: int, arg2: Literal["bar", "baz"]) -> None:
+        """dummy function
+
+        Args:
+            arg1: foo
+            arg2: one of 'bar', 'baz'
+        """
+        pass
+
+
 def test_convert_to_openai_function(
     pydantic: Type[BaseModel],
     function: Callable,
@@ -94,7 +117,15 @@ def test_convert_to_openai_function(
         },
     }
 
-    for fn in (pydantic, function, dummy_tool, json_schema, expected):
+    for fn in (
+        pydantic,
+        function,
+        dummy_tool,
+        json_schema,
+        expected,
+        Dummy.dummy_function,
+        DummyWithClassMethod.dummy_function,
+    ):
         actual = convert_to_openai_function(fn)  # type: ignore
         assert actual == expected