@router.get("/livekit/get-token")
async def get_livekit_token_endpoint(
    request: Request,
    user: User = Depends(require_invite),
):
    print("get_livekit_token_endpoint", user)
    from livekit import api

    # Convert user model to dict and ensure all values are strings
    # since with_attributes expects dict[str, str]
    user_dict = user.model_dump()
    user_attributes = {k: str(v) if v is not None else "" for k, v in user_dict.items()}

    token = (
        api.AccessToken(settings.livekit_api_key, settings.livekit_api_secret)
        .with_identity(user.id)
        .with_name(f"notbf-stream")
        .with_metadata(json.dumps(user_attributes))
        .with_grants(
            api.VideoGrants(
                room_join=True,
                room="notbf-stream",
            )
        )
    )

    return {
        "participantName": f"{token.identity}",
        "participantToken": token.to_jwt(),
        "roomName": "notbf-stream",
        "serverUrl": settings.livekit_url,
    }

how can I get the stuff from with_metadata() when user connects to the Agent