Initial Agent Definition with Tools

Using the OpenAI Agents SDK, define an initial `Assistant` with a `GPT-4o` model. Create a `tool` definition for scheduling calendar events (e.g., `schedule_calendar_event(title: str, start_time: str, end_time: str, attendees: list[str])`) and for sending short emails (e.g., `send_short_email(recipient: str, subject: str, body: str)`). Your agent should be instructed to act as a proactive executive assistant.

```python
from openai import OpenAI

client = OpenAI()

assistant = client.beta.assistants.create(
    name='Executive Assistant',
    instructions='You are a proactive executive assistant. Your goal is to manage the user\'s schedule, communications, and information flow efficiently. Always confirm actions before executing, unless explicitly told otherwise.',
    model='gpt-4o',
    tools=[
        {
            'type': 'function',
            'function': {
                'name': 'schedule_calendar_event',
                'description': 'Schedules a new event on the user\'s calendar.',
                'parameters': {
                    'type': 'object',
                    'properties': {
                        'title': {'type': 'string', 'description': 'Title of the event'},
                        'start_time': {'type': 'string', 'format': 'date-time', 'description': 'Start time in ISO 8601 format'},
                        'end_time': {'type': 'string', 'format': 'date-time', 'description': 'End time in ISO 8601 format'},
                        'attendees': {'type': 'array', 'items': {'type': 'string'}, 'description': 'List of email addresses of attendees'}
                    },
                    'required': ['title', 'start_time', 'end_time', 'attendees']
                }
            }
        },
        # Add send_short_email tool definition here
    ]
)
print(assistant)
```