Openhost Environment

Running inside an OpenHost-hosted Sculptor

You're in a Sculptor instance deployed as an OpenHost app if the OPENHOST_* env vars are set (OPENHOST_APP_NAME, OPENHOST_APP_DATA_DIR, OPENHOST_ZONE_DOMAIN, …). The public URL is https://$OPENHOST_APP_NAME.$OPENHOST_ZONE_DOMAIN/, behind OpenHost's owner SSO. If those vars are absent, this skill does not apply.

Storage — what survives a restart/rebuild

• Only $OPENHOST_APP_DATA_DIR (/data/app_data/<app>) persists across reloads/rebuilds — it's the backed-up app-data mount. The DB, workspaces, Claude config/creds, and the gh token all live under it.
• /home is wiped on every rebuild — clones, ~/.gitconfig (git identity + the gh auth setup-git credential wiring), and scratch are all lost.
• So keep anything durable under the app-data dir, never in /home.

Adding repositories + gh auth

• Add repos via the app (Settings → Repositories) or sculpt (sculpt workspace list --repo <path> registers one). Clone to a persisted path, not /home.
• gh auth: gh auth login (device flow — paste the one-time code in a browser). The token persists (the gh config dir is under the app-data mount), but the git credential-helper wiring + identity live in ~/.gitconfig and reset on rebuild. The deploy's run script re-runs gh auth setup-git and sets a gh-derived identity on boot (best-effort); if a push ever fails to auth after a rebuild, re-run gh auth setup-git and set git config --global user.{name,email}.

/proxy/<port>/ — preview a loopback web app from any browser

OpenHost publicly proxies only port 5050 (behind owner SSO); an in-container nginx fronts it and adds a reverse proxy:

• https://$OPENHOST_APP_NAME.$OPENHOST_ZONE_DOMAIN/proxy/<port>/ forwards to 127.0.0.1:<port> for any port in 51000–59999, all behind SSO. Nothing is made public.
• Use it to preview any simple loopback web app or dev server (not just Vite), including from a phone. The URI is passed through unstripped, so the app must be base-aware — served under /proxy/<port>/ (e.g. a dev server's base/prefix option), since fully transparent rewriting of an app's absolute URLs isn't done.
• Caveat — shared origin: the preview shares the root app's origin, so its cookies/paths must not collide with Sculptor's (the session cookie in particular). Simple apps with their own non-overlapping cookies/paths are fine; a second full Sculptor backend is not (its session cookie would collide).
• /proxy/ (no port) is a switchboard: a small nginx-served page that scans the band from the browser and links to the live previews it finds. The same page is served when a /proxy/<port>/ target is dead ("preview is not running", with a way back and an auto-reload once the server returns), so a phone PWA — which has no URL bar — can never get stranded on a dead preview.
• The deployed Sculptor UI also shows a preview-switcher pill (bottom-left footer corner): the openhost-preview-switcher extension, auto-installed at boot from the image, lists live previews and switches between them and the deployed app in place.
• For the Sculptor web frontend specifically, use the openhost-frontend-preview skill / sculptor/frontend/launch-preview.sh (when working in the sculptor repo).

Turn-handling (matters here)

This Sculptor does not release your turn to the user while a tracked run_in_background Bash task or a persistent Monitor is alive. Launch long-lived servers detached from a normal foreground command instead: setsid <cmd> >/tmp/x.log 2>&1 </dev/null &. Detached/orphaned processes keep running and don't hold the turn; check on them later via ps / curl / log reads.

This skill ships with the OpenHost deploy image and is refreshed on every release, so it stays current. The owner's standing instructions live in the seeded AGENTS.md in the same config dir.