MemgraphToolkit

# os.environ["LANGSMITH_API_KEY"] = getpass.getpass("Enter your LangSmith API key: ")
# os.environ["LANGSMITH_TRACING"] = "true"

%pip install -qU langchain-memgraph

from langchain.chat_models import init_chat_model
from langchain_memgraph import MemgraphToolkit
from langchain_memgraph.graphs.memgraph import MemgraphLangChain

db = MemgraphLangChain(url=url, username=username, password=password)

llm = init_chat_model("gpt-4o-mini", model_provider="openai")

toolkit = MemgraphToolkit(
    db=db,  # Memgraph instance
    llm=llm,  # LLM chat model for LLM operations
)

toolkit.get_tools()

from langchain_memgraph.tools import QueryMemgraphTool

# Rest of the code omitted for brevity

tool.invoke({QueryMemgraphTool({"query": "MATCH (n) RETURN n LIMIT 5"})})

from langchain.agents import create_agent

agent_executor = create_agent(llm, tools)

example_query = "MATCH (n) RETURN n LIMIT 1"

events = agent_executor.stream(
    {"messages": [("user", example_query)]},
    stream_mode="values",
)
for event in events:
    event["messages"][-1].pretty_print()