opencode crashes on boot when models.dev is unreachable with no cache #35713

Description

If models.dev is unreachable and there's no local cache yet (fresh install, or cache cleared), opencode crashes on boot instead of degrading gracefully. The server dies mid-bootstrap and the TUI just shows:

Error: Unexpected server error. Check server logs for details.

and exits. Nothing in the UI, no toast, no partial startup - it just closes.

Log on the server side stops dead right after the fetch fails, nothing after it:

timestamp=2026-07-07T11:32:22.844Z level=INFO run=c20bd434 message=init
timestamp=2026-07-07T11:32:22.9xxZ level=ERROR run=c20bd434 message="Failed to fetch models.dev" cause="Cause([Fail(HttpClientError: Transport error (GET .../api.json) (cause: Error: Unable to connect. Is the computer able to access the url?))])"

(process exits here, no further log lines)

Looks like populate() in packages/core/src/models-dev.ts pipes the fetch through Effect.orDie, so a plain network failure turns into an unrecoverable defect that kills the whole instance bootstrap rather than just failing to load the catalog.

There's a second related spot: currentModel() in packages/opencode/src/session/prompt.ts also does provider.defaultModel().pipe(Effect.orDie), so if you already have a project with a saved model selection and the catalog ends up empty for the same reason, sending a prompt dies the same way instead of surfacing a normal error.

Plugins

None

OpenCode version

1.17.14

Steps to reproduce

1. Make sure there's no cached catalog (rm ~/.cache/opencode/models.json or use a fresh XDG_CACHE_HOME)
2. Point the fetch at something unreachable, e.g. OPENCODE_MODELS_URL=http://127.0.0.1:1
3. Start opencode in a project directory
4. It boots, then dies within a couple seconds with the error above

Screenshot and/or share link

No response

Operating System

macOS

Terminal

No response