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概述

LangChain 代理使用 LangGraph 持久化 来实现长期记忆。这是一个较为高级的主题，需要具备 LangGraph 相关知识才能使用。

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记忆存储

LangGraph 将长期记忆以 JSON 文档的形式存储在 存储库 中。 每段记忆都组织在一个自定义的 namespace（类似于文件夹）和一个唯一的 key（类似于文件名）下。命名空间通常包含用户或组织 ID 或其他便于组织信息的标签。 这种结构支持记忆的层次化组织。然后通过内容过滤器支持跨命名空间的搜索。 
from langgraph.store.memory import InMemoryStore


def embed(texts: list[str]) -> list[list[float]]:
    # Replace with an actual embedding function or LangChain embeddings object
    return [[1.0, 2.0] * len(texts)]


# InMemoryStore saves data to an in-memory dictionary. Use a DB-backed store in production use.
store = InMemoryStore(index={"embed": embed, "dims": 2}) 
user_id = "my-user"
application_context = "chitchat"
namespace = (user_id, application_context) 
store.put( 
    namespace,
    "a-memory",
    {
        "rules": [
            "User likes short, direct language",
            "User only speaks English & python",
        ],
        "my-key": "my-value",
    },
)
# get the "memory" by ID
item = store.get(namespace, "a-memory") 
# search for "memories" within this namespace, filtering on content equivalence, sorted by vector similarity
items = store.search( 
    namespace, filter={"my-key": "my-value"}, query="language preferences"
)
有关记忆存储的更多信息，请参阅 持久化 指南。

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在工具中读取长期记忆

一个代理可以用来查找用户信息的工具
from dataclasses import dataclass

from langchain_core.runnables import RunnableConfig
from langchain.agents import create_agent
from langchain.tools import tool, ToolRuntime
from langgraph.store.memory import InMemoryStore


@dataclass
class Context:
    user_id: str

# InMemoryStore saves data to an in-memory dictionary. Use a DB-backed store in production.
store = InMemoryStore() 

# Write sample data to the store using the put method
store.put( 
    ("users",),  # Namespace to group related data together (users namespace for user data)
    "user_123",  # Key within the namespace (user ID as key)
    {
        "name": "John Smith",
        "language": "English",
    }  # Data to store for the given user
)

@tool
def get_user_info(runtime: ToolRuntime[Context]) -> str:
    """Look up user info."""
    # Access the store - same as that provided to `create_agent`
    store = runtime.store 
    user_id = runtime.context.user_id
    # Retrieve data from store - returns StoreValue object with value and metadata
    user_info = store.get(("users",), user_id) 
    return str(user_info.value) if user_info else "Unknown user"

agent = create_agent(
    model="anthropic:claude-sonnet-4-5",
    tools=[get_user_info],
    # Pass store to agent - enables agent to access store when running tools
    store=store, 
    context_schema=Context
)

# Run the agent
agent.invoke(
    {"messages": [{"role": "user", "content": "look up user information"}]},
    context=Context(user_id="user_123") 
)

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从工具写入长期记忆

一个更新用户信息的工具示例
from dataclasses import dataclass
from typing_extensions import TypedDict

from langchain.agents import create_agent
from langchain.tools import tool, ToolRuntime
from langgraph.store.memory import InMemoryStore


# InMemoryStore saves data to an in-memory dictionary. Use a DB-backed store in production.
store = InMemoryStore() 

@dataclass
class Context:
    user_id: str

# TypedDict defines the structure of user information for the LLM
class UserInfo(TypedDict):
    name: str

# Tool that allows agent to update user information (useful for chat applications)
@tool
def save_user_info(user_info: UserInfo, runtime: ToolRuntime[Context]) -> str:
    """Save user info."""
    # Access the store - same as that provided to `create_agent`
    store = runtime.store 
    user_id = runtime.context.user_id 
    # Store data in the store (namespace, key, data)
    store.put(("users",), user_id, user_info) 
    return "Successfully saved user info."

agent = create_agent(
    model="anthropic:claude-sonnet-4-5",
    tools=[save_user_info],
    store=store, 
    context_schema=Context
)

# Run the agent
agent.invoke(
    {"messages": [{"role": "user", "content": "My name is John Smith"}]},
    # user_id passed in context to identify whose information is being updated
    context=Context(user_id="user_123") 
)

# You can access the store directly to get the value
store.get(("users",), "user_123").value
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