if j == -1 {
		return nil, fmt.Errorf("webhook URL %s is malformed", u)
	}
	ret.gcpProject = u.Path[i : i+j]

	const crSeg = "/ISTIO_META_CLOUDRUN_ADDR/"
	i += j
	j = strings.Index(u.Path[i:], crSeg)
	if j == -1 {
		return nil, fmt.Errorf("webhook URL %s is missing %s", u, crSeg)
	}
	ret.istiod = u.Path[i+j+len(crSeg):]

	return ret, nil

	if !ok {
		return nil, errors.New(`field "spec.workload_identity_pool" is not a string`)
	}
	return &mem, nil
}

func mcpDialOptions(ctx context.Context, gcpProject string, k8sCreds credentials.PerRPCCredentials) ([]grpc.DialOption, error) {
	systemRoots, err := x509.SystemCertPool()
	if err != nil {
		return nil, fmt.Errorf("failed to get system cert pool: %w", err)
	}

}

func mcpTransport(ctx context.Context, tr http.RoundTripper) (http.RoundTripper, error) {
	creds, err := google.FindDefaultCredentials(ctx, "https://www.googleapis.com/auth/cloud-platform")
	if err != nil {
		return nil, fmt.Errorf("finding default GCP credentials: %w", err)
	}
	return &oauth2.Transport{
		Base:   tr,
		Source: creds.TokenSource,
	}, nil