chore: remove copilotkit_messages_to_langchain

No longer needed now that LangGraphAgent is gone — the only caller was
the deprecated agent class. Also removed from langchain.py re-exports.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

sdk-python/copilotkit/langchain.py

@@ -4,7 +4,6 @@ copilotkit.langchain is deprecated. Use copilotkit.langgraph instead.
 import warnings
 from copilotkit.langgraph import (
   langchain_messages_to_copilotkit,
-  copilotkit_messages_to_langchain,
   copilotkit_customize_config,
   copilotkit_exit,
   copilotkit_emit_state,
@@ -21,7 +20,6 @@ warnings.warn(
 
 __all__ = [
   "langchain_messages_to_copilotkit",
-  "copilotkit_messages_to_langchain",
   "copilotkit_customize_config",
   "copilotkit_exit",
   "copilotkit_emit_state",

sdk-python/copilotkit/langgraph.py

@@ -5,7 +5,7 @@ LangChain specific utilities for CopilotKit
 import uuid
 import warnings
 import asyncio
-from typing import List, Optional, Any, Union, Dict, Callable, cast
+from typing import List, Optional, Any, Union, Dict
 from typing_extensions import TypedDict
 from langgraph.graph import MessagesState
 
@@ -45,68 +45,6 @@ class CopilotKitState(MessagesState):
     copilotkit: CopilotKitProperties
 
 
-def copilotkit_messages_to_langchain() -> Callable[[List[Message]], List[BaseMessage]]:
-    """
-    Convert CopilotKit messages to LangChain messages
-    """
-    def _copilotkit_messages_to_langchain(messages: List[Message]) -> List[BaseMessage]:
-        result = []
-        processed_action_executions = set()
-        for message in cast(Any, messages):
-            if message["type"] == "TextMessage":
-                if message["role"] == "user":
-                    result.append(HumanMessage(content=message["content"], id=message["id"]))
-                elif message["role"] == "system":
-                    result.append(SystemMessage(content=message["content"], id=message["id"]))
-                elif message["role"] == "assistant":
-                    result.append(AIMessage(content=message["content"], id=message["id"]))
-            elif message["type"] == "ActionExecutionMessage":
-                # convert multiple tool calls to a single message
-                message_id = message.get("parentMessageId")
-                if message_id is None:
-                    message_id = message["id"]
-
-                if message_id in processed_action_executions:
-                    continue
-
-                processed_action_executions.add(message_id)
-
-                all_tool_calls = []
-
-                # Find all tool calls for this message (only ActionExecutionMessage type)
-                for msg in messages:
-                    if msg.get("type") != "ActionExecutionMessage":
-                        continue
-                    if msg.get("parentMessageId", None) == message_id or msg["id"] == message_id:
-                        all_tool_calls.append(msg)
-
-                tool_calls = [{
-                    "name": t["name"],
-                    "args": t["arguments"],
-                    "id": t["id"],
-                } for t in all_tool_calls]
-
-                result.append(
-                    AIMessage(
-                        id=message_id,
-                        content="",
-                        tool_calls=tool_calls
-                    )
-                )
-
-            elif message["type"] == "ResultMessage":
-                result.append(ToolMessage(
-                    id=message["id"],
-                    content=message["result"],
-                    name=message["actionName"],
-                    tool_call_id=message["actionExecutionId"]
-                ))
-
-        return result
-
-    return _copilotkit_messages_to_langchain
-
-
 def langchain_messages_to_copilotkit(
         messages: List[BaseMessage]
     ) -> List[Message]: