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Every task runs in an isolated sandbox with a real development environment. Twill doesn’t just edit files — it can boot your project, run checks, and validate changes against a running app. You can access the same sandbox directly from the task page to review what changed and approve with confidence.

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How Twill Uses Live Previews to Self-Verify

Depending on the task and your repo, Twill may:
  • Start your app via the repository entrypoint script
  • Run tests / lint / typecheck / builds to catch regressions
  • Exercise UI flows with browser automation when the change is user-facing
  • Inspect logs to confirm services are healthy and errors are not introduced

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Web Preview

Click Preview to open your running application on any exposed port. Each port gets a unique public URL that works in your browser — useful for quickly validating UI and behavior during review.

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SSH Access

Connect your local IDE (VS Code, Cursor) directly to the sandbox via SSH. This lets you browse files, run commands, and debug as if you were working locally.

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Logs

Monitor your services in real-time. Each service that writes to $TWILL_ENTRYPOINT_LOG_DIR appears as a separate tab:
  • dev-server.log — Frontend output
  • api.log — Backend output
  • entrypoint.log — Startup script output
Logs stream live as the agent works, so you can watch exactly what’s happening.