langgraph-state

SKILL.md

Note: MessageGraph is deprecated in LangGraph v1.0.0. Use StateGraph with a messages key instead.

| TypedDict vs Pydantic | TypedDict for internal state, Pydantic at boundaries | | Messages state | Use MessagesState or addmessages reducer | | Accumulators | Always use Annotated[list, add] for multi-agent | | Nesting | Keep state flat (easier debugging) | | Immutability | Return new state, don't mutate |

2026 Guidance: Use TypedDict inside the graph (lightweight, no runtime overhead). Use Pydantic at boundaries (inputs/outputs, user-facing data) for validation.

LangGraph 状态管理模式。在设计工作流状态模式、使用 TypedDict 与 Pydantic、使用带注释的运算符实现累积状态或管理跨节点的共享状态时使用。 来源：yonatangross/orchestkit。

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