.

libs/core/langchain_core/messages/ai.py

@@ -184,10 +184,16 @@ class AIMessage(BaseMessage):
         **kwargs: Any,
     ) -> None: ...
 
+    def __init__(
+        self,
+        content: Union[str, list[Union[str, dict]]],
+        **kwargs: Any,
+    ) -> None:
+        """Initialize AIMessage.
+
         Args:
             content: The content of the message.
             kwargs: Additional arguments to pass to the parent class.
-
         """
         super().__init__(content=content, **kwargs)
 

libs/core/langchain_core/messages/base.py

@@ -74,9 +74,15 @@ class BaseMessage(Serializable):
         **kwargs: Any,
     ) -> None: ...
 
+    def __init__(
+        self,
+        content: Union[str, list[Union[str, dict]]],
+        **kwargs: Any,
+    ) -> None:
+        """Initialize BaseMessage.
+
         Args:
             content: The string contents of the message.
-
         """
         super().__init__(content=content, **kwargs)
 

libs/core/langchain_core/messages/human.py

@@ -1,8 +1,7 @@
 """Human message."""
 
-from typing import Any, Literal, Optional, Union, cast, overload
+from typing import Any, Literal, Union, overload
 
-from langchain_core.messages import content as types
 from langchain_core.messages.base import BaseMessage, BaseMessageChunk
 
 
@@ -54,10 +53,16 @@ class HumanMessage(BaseMessage):
         **kwargs: Any,
     ) -> None: ...
 
+    def __init__(
+        self,
+        content: Union[str, list[Union[str, dict]]],
+        **kwargs: Any,
+    ) -> None:
+        """Initialize HumanMessage.
+
         Args:
             content: The string contents of the message.
             kwargs: Additional fields to pass to the message.
-
         """
         super().__init__(content=content, **kwargs)
 

libs/core/langchain_core/messages/tool.py

@@ -1,15 +1,13 @@
 """Messages for tools."""
 
 import json
-from typing import Any, Literal, Optional, Union, cast, overload
+from typing import Any, Literal, Optional, Union, overload
 from uuid import UUID
 
 from pydantic import Field, model_validator
 from typing_extensions import NotRequired, TypedDict, override
 
-from langchain_core.messages import content as types
 from langchain_core.messages.base import BaseMessage, BaseMessageChunk, merge_content
-from langchain_core.messages.content import InvalidToolCall as InvalidToolCall
 from langchain_core.utils._merge import merge_dicts, merge_obj
 
 
@@ -150,10 +148,16 @@ class ToolMessage(BaseMessage, ToolOutputMixin):
         **kwargs: Any,
     ) -> None: ...
 
+    def __init__(
+        self,
+        content: Union[str, list[Union[str, dict]]],
+        **kwargs: Any,
+    ) -> None:
+        """Initialize ToolMessage.
+
         Args:
             content: The string contents of the message.
             **kwargs: Additional fields.
-
         """
         super().__init__(content=content, **kwargs)