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 state management patterns. Use when designing workflow state schemas, using TypedDict vs Pydantic, implementing accumulating state with Annotated operators, or managing shared state across nodes. Source: yonatangross/skillforge-claude-plugin.

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