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This notebook goes over how to use the Google Finance Tool to get information from the Google Finance page. To get an SerpApi key key, sign up at: serpapi.com/users/sign_up. To use the tool with LangChain install following packages 
pip install -qU google-search-results langchain-community
Then set the environment variable SERPAPI_API_KEY to your SerpApi key or pass the key in as a argument to the wrapper serp_api_key=“your secret key”. 
import os

os.environ["SERPAPI_API_KEY"] = ""

from langchain_community.tools.google_finance import GoogleFinanceQueryRun
from langchain_community.utilities.google_finance import GoogleFinanceAPIWrapper

tool = GoogleFinanceQueryRun(api_wrapper=GoogleFinanceAPIWrapper())

tool.run("Google")

'\nQuery: Google\nstock: GOOGL:NASDAQ\nprice: $159.96\npercentage: 0.94\nmovement: Up\nus: price = 42210.57, movement = Down\neurope: price = 23638.56, movement = Up\nasia: price = 38183.26, movement = Up\n'
In order to create an agent that uses the Google Finance tool install LangGraph 
pip install -qU langgraph langchain-openai
and use the create_agent functionality to initialize a ReAct agent. You will also need to set up your OPEN_API_KEY (visit platform.openai.com) in order to access OpenAI’s chat models. 
import os

os.environ["OPENAI_API_KEY"] = ""
os.environ["SERP_API_KEY"] = ""

from langchain.chat_models import init_chat_model

model = init_chat_model("gpt-4.1-mini", model_provider="openai")

from langchain_community.agent_toolkits.load_tools import load_tools

tools = load_tools(["google-scholar", "google-finance"], llm=model)

from langchain.agents import create_agent


agent = create_agent(model, tools)

events = agent.stream(
    {"messages": [("user", "What is Google's stock?")]},
    stream_mode="values",
)
for event in events:
    event["messages"][-1].pretty_print()

================================ Human Message =================================

What is Google's stock?
================================== Ai Message ==================================
Tool Calls:
  google_finance (call_8m0txCtxNuQaAv9UlomPhSA1)
 Call ID: call_8m0txCtxNuQaAv9UlomPhSA1
  Args:
    query: Google
================================= Tool Message =================================
Name: google_finance


Query: Google
stock: GOOGL:NASDAQ
price: $159.96
percentage: 0.94
movement: Up
us: price = 42210.57, movement = Down
europe: price = 23638.56, movement = Up
asia: price = 38183.26, movement = Up

================================== Ai Message ==================================

Google's stock, listed as GOOGL on NASDAQ, is currently priced at $159.96, with a movement up by 0.94%.
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