nsc-tui is an interactive front-end to nsc(1), the tool that manages NATS
operators, accounts and users. It shows the local nsc store as a tree,
opens dialog editors for the JWT claims of each entity, and covers the
parts of nsc that are tedious to type: JetStream limits and replication
tiers, scoped signing keys, exports, imports and activations, subject
mappings, revocations, authorization callout, creds files and the
operator push and pull cycle.

Nothing is written except through nsc itself. Every change is first
diffed into a plan of the exact nsc commands it needs, shown with the
same quoting a shell would need, and only then run, stopping at the
first failure. The one exception is deleting an operator, which nsc
cannot do; the local files it removes are listed as plain rm lines.