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fix: clean shared messages state in case of history rewrite #93

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fix: clean shared messages state in case of history rewrite #93

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5 changes: 3 additions & 2 deletions langgraph_swarm/handoff.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2,8 +2,9 @@
from dataclasses import is_dataclass
from typing import Annotated, Any

from langchain_core.messages import ToolMessage
from langchain_core.messages import ToolMessage, RemoveMessage
from langchain_core.tools import BaseTool, InjectedToolCallId, tool
from langgraph.graph.message import REMOVE_ALL_MESSAGES
from langgraph.graph.state import CompiledStateGraph
from langgraph.prebuilt import InjectedState, ToolNode
from langgraph.types import Command
Expand Down Expand Up @@ -84,7 +85,7 @@ def handoff_to_agent(
goto=agent_name,
graph=Command.PARENT,
update={
"messages": [*_get_field(state, "messages"), tool_message],
"messages": [RemoveMessage(REMOVE_ALL_MESSAGES), *_get_field(state, "messages"), tool_message],
"active_agent": agent_name,
},
)
Expand Down