LlamaIndex

pip install llama-index requests

import os, requests
from llama_index.core.tools import FunctionTool
from llama_index.core.agent.workflow import FunctionAgent
from llama_index.llms.openai import OpenAI

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

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()

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

tools = [FunctionTool.from_defaults(fn=f) for f in (send_email, check_inbox)]

agent = FunctionAgent(tools=tools, llm=OpenAI(model="gpt-4o"),
                      system_prompt="You manage an email inbox.")

import asyncio
print(asyncio.run(agent.run("Check inbox inb_123 and tell me what needs a reply.")))