# Support The Built-In UI Only On Remote Dev Full

The built-in CP9 UI is supported only on Remote Dev full Fast-start sessions, where the existing public api-gateway, HTTPS session hostname, wildcard TLS certificate, and bounded Auth0 wildcard provide one complete browser-origin contract. Local-k3d sessions do not deploy the UI slice and CP9 does not define a localhost port-forward, loopback Auth0 callback, local TLS/DNS origin, or Local browser acceptance path. This is an explicit product boundary rather than a deferred v1 feature: supporting Local later would require a new specification that overturns this decision. Keeping one placement avoids two different exposure, login, lifecycle, and proof models.