core[minor], integrations...[patch]: Support ToolCall as Tool input and ToolMessage as Tool output

libs/core/langchain_core/messages/base.py

@@ -11,6 +11,8 @@
 if TYPE_CHECKING:
     from langchain_core.prompts.chat import ChatPromptTemplate
 
+Content = Union[str, List[Union[str, Dict]]]
+
 
 class BaseMessage(Serializable):
     """Base abstract message class.

libs/core/langchain_core/messages/tool.py

@@ -124,6 +124,10 @@ class ToolCall(TypedDict):
     """
 
 
+class TypedToolCall(ToolCall):
+    type: Literal["tool_call"]
+
+
 class ToolCallChunk(TypedDict):
     """A chunk of a tool call (e.g., as part of a stream).