The principle of subgraphs in LangGraph: for each node, if it is a subgraph, is its state isolated—unaffected by other subgraphs? Specifically, if multiple subgraphs run concurrently and modify the same key (which could be defined in the parent graph or shared among these subgraphs), suppose Subgrap…

Tried to create a minimal example similar to your original query class State(TypedDict): messages: Annotated[Sequence[BaseMessage], add_messages] class Subgraph1State(TypedDict): messages: Annotated[Sequence[BaseMessage], add_messages] subgraph1_messages: Annotated[Sequence[BaseMessag…

I know how to use subgraphs; my question is whether the states between subgraphs are isolated from each other.

How does state work in LangGraph subgraphs?

OSS Product Help LangGraph

heisenberg-7 October 6, 2025, 1:46pm 2

Hi @tiebingice

Sub-graphs documentation has references about state be it shared or different: Use subgraphs

Parallel execution: Use the Graph API

Defer Node execution: Use the Graph API

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How does state work in LangGraph subgraphs?

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