The [[ https://github.com/eevans/cassandra-tools-wmf | c-cqlsh ]] tool does not support single instance installations (like is still in use in deployment-prep). Making it do so would be trivial, and useful.
Customize query in gerrit
As it turns out, it does in fact support single instance environments via an instance ID of default. The attached Gerrit changeset causes the absence of an argument to be treated as default.