draft_message["Subject"] = subject
        if cc is not None:
            draft_message["Cc"] = ", ".join(cc)
        if bcc is not None:
            draft_message["Bcc"] = ", ".join(bcc)
        encoded_message = base64.urlsafe_b64encode(draft_message.as_bytes()).decode()
        return {"message": {"raw": encoded_message}}
    def _run(
        self,
        message: str,
        to: List[str],
        subject: str,
        cc: Optional[List[str]] = None,
        bcc: Optional[List[str]] = None,
        run_manager: Optional[CallbackManagerForToolRun] = None,
    ) -> str:
        try:
            create_message = self._prepare_draft_message(message, to, subject, cc, bcc)
            draft = (
                self.api_resource.users()
                .drafts()
                .create(userId="me", body=create_message)
                .execute()
            )
            output = f'Draft created. Draft Id: {draft["id"]}'
            return output
        except Exception as e:
            raise Exception(f"An error occurred: {e}")