LangGraph State Management

Design and manage state schemas for LangGraph workflows.

TypedDict Approach (Simple)

from typing import TypedDict, Annotated
from operator import add

class WorkflowState(TypedDict):
    input: str
    output: str
    agent_responses: Annotated[list[dict], add]  # Accumulates
    metadata: dict

MessagesState Pattern (2026 Best Practice)