{
    "name": "stalwart_send_email",
    "description": "Send a new email.",
    "parameters": {
        "type": "object",
        "properties": {
            "to": {
                "type": "string",
                "description": "Recipient email address."
            },
            "subject": {
                "type": "string",
                "description": "Subject of the email."
            },
            "textBody": {
                "type": "string",
                "description": "Plain text body of the email."
            },
            "htmlBody": {
                "type": "string",
                "description": "Optional HTML body of the email."
            }
        },
        "required": ["to", "subject", "textBody"]
    }
}