LangChain

pip install langchain langchain-openai langgraph requests

import os, requests
from langchain_core.tools import tool

API = "https://api.sentvia.ai/v1"
H = {"Authorization": f"Bearer {os.environ['SENTVIA_KEY']}"}

@tool
def create_inbox(local_part: str) -> dict:
    """Create a new email inbox. Returns its id and address."""
    return requests.post(f"{API}/inboxes", headers=H, json={"local_part": local_part}).json()

@tool
def send_email(inbox_id: str, to: str, subject: str, body: str) -> dict:
    """Send an email from an inbox to a recipient."""
    return requests.post(f"{API}/messages", headers=H,
        json={"inbox_id": inbox_id, "to": [to], "subject": subject, "text": body}).json()

@tool
def check_inbox(inbox_id: str) -> list:
    """List the most recent messages in an inbox."""
    return requests.get(f"{API}/messages", headers=H,
        params={"inbox_id": inbox_id, "limit": 10}).json()["messages"]

from langchain_openai import ChatOpenAI
from langgraph.prebuilt import create_react_agent

agent = create_react_agent(ChatOpenAI(model="gpt-4o"), [create_inbox, send_email, check_inbox])

result = agent.invoke({"messages": [
    ("user", "Create an inbox called concierge and email jane@acme.com a welcome note.")
]})
print(result["messages"][-1].content)