记忆总览

// Node that *uses* the instructions
const callModel = async (state: State, store: BaseStore) => {
    const namespace = ["agent_instructions"];
    const instructions = await store.get(namespace, "agent_a");
    // Application logic
    const prompt = promptTemplate.format({
        instructions: instructions[0].value.instructions
    });
    // ...
};

// Node that updates instructions
const updateInstructions = async (state: State, store: BaseStore) => {
    const namespace = ["instructions"];
    const currentInstructions = await store.search(namespace);
    // Memory logic
    const prompt = promptTemplate.format({
        instructions: currentInstructions[0].value.instructions,
        conversation: state.messages
    });
    const output = await llm.invoke(prompt);
    const newInstructions = output.new_instructions;
    await store.put(["agent_instructions"], "agent_a", {
        instructions: newInstructions
    });
    // ...
};

import { InMemoryStore } from "@langchain/langgraph";

const embed = (texts: string[]): number[][] => {
    // Replace with an actual embedding function or LangChain embeddings object
    return texts.map(() => [1.0, 2.0]);
};

// InMemoryStore saves data to an in-memory dictionary. Use a DB-backed store in production use.
const store = new InMemoryStore({ index: { embed, dims: 2 } });
const userId = "my-user";
const applicationContext = "chitchat";
const namespace = [userId, applicationContext];

await store.put(
    namespace,
    "a-memory",
    {
        rules: [
            "User likes short, direct language",
            "User only speaks English & TypeScript",
        ],
        "my-key": "my-value",
    }
);

// get the "memory" by ID
const item = await store.get(namespace, "a-memory");

// search for "memories" within this namespace, filtering on content equivalence, sorted by vector similarity
const items = await store.search(
    namespace,
    {
        filter: { "my-key": "my-value" },
        query: "language preferences"
    }
);