These tools are meant to make your life easier if you are using Google Cloud Storage for transferring files to this machine.
To update the tools:
gsutil -m rsync -d gs://chrome-auth-lab-staging/tools C:\Tools\chrome-auth-lab
gsutil -m rsync -d gs://chrome-auth-lab-staging/tools $HOME/tools
If you edit anything here, push to the project source repository and also run the following to sync the storage bucket. The VMs don't have access to the source repository:
gsutil -m rsync -d . gs://chrome-auth-lab-staging/tools