# WebContainer preview diagnostic record

Do not include tokens, cookies, environment values, customer data or private source.

## Environment

- Browser and version:
- Device/OS class:
- Project type:
- Application root:
- Package manager and version:
- Lockfile name and digest:

## First failed phase

- [ ] Browser capability
- [ ] Workspace boot
- [ ] File mount
- [ ] Dependency installation
- [ ] Build
- [ ] Dev-server start
- [ ] Port discovery
- [ ] Application runtime

## Safe evidence

- Command name:
- Exit status:
- First error line with paths/values redacted:
- Expected port:
- Observed port:
- Generated folders present in source import:
- Minimal known-good project result:

## Recovery attempted

- Single phase retried:
- Cache identity checked:
- Clean boot required and why:
- Final outcome: