> ## Documentation Index
> Fetch the complete documentation index at: https://docs.sentfrom.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# OpenAI Agents SDK

> Email tools for the OpenAI Agents SDK.

The OpenAI Agents SDK turns plain Python functions into tools with `@function_tool`.

## Install

```bash theme={null}
pip install openai-agents requests
```

## Define the tools and agent

```python theme={null}
import os, requests
from agents import Agent, Runner, function_tool

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

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

@function_tool
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"]

@function_tool
def reply(message_id: str, body: str) -> dict:
    """Reply to a message, keeping it in thread."""
    return requests.post(f"{API}/messages/{message_id}/reply", headers=H, json={"text": body}).json()

agent = Agent(
    name="Email agent",
    instructions="You manage an email inbox. Triage and reply to messages.",
    tools=[send_email, check_inbox, reply],
)

result = Runner.run_sync(agent, "Check inbox inb_123 and reply to anything urgent.")
print(result.final_output)
```

The runner loops tool calls automatically until the agent is done.

<Tip>If your runtime speaks MCP, the [SentFromAI MCP server](/guides/mcp) exposes these same operations with no wrapper code.</Tip>