solana-agent-kit/examples/agent-kit-langgraph/src/utils/state.ts

import { Annotation } from "@langchain/langgraph";
import { BaseMessage } from "@langchain/core/messages";
import { messagesStateReducer } from "@langchain/langgraph";

export const solanaAgentState = Annotation.Root({
  messages: Annotation<BaseMessage[]>({
    reducer: messagesStateReducer,
    default: () => [],
  }),

  isSolanaReadQuery: Annotation<boolean>({
    reducer: (x, y) => y ?? x ?? false,
    default: () => false,
  }),

  isSolanaWriteQuery: Annotation<boolean>({
    reducer: (x, y) => y ?? x ?? false,
    default: () => false,
  }),

  isGeneralQuery: Annotation<boolean>({
    reducer: (x, y) => y ?? x ?? false,
    default: () => false,
  }),
});