Preview Environments

How to set up, connect, and use preview environments in Baz

Preview environments let Baz open your UI in a sandboxed browser, validate the ticket’s requirements, collect screenshots, and run full Spec Reviews. Without a working preview environment, Baz agents will fall back on a Spec Review focused on Code <> Ticket <> Design alignment.

This guide explains what you need, how to connect it, and how to give Baz the correct preview URL so everything works end-to-end.

1. What is a preview environment?

A preview environment is an internet-accessible instance of your deployed application for a specific pull request or branch. Examples:

• https://cr-123.yourcompany.com

• https://vercel.app/pr-77

• https://feature-branch.preevy.dev

Baz uses this environment to:

• Load your UI via Playwright

• Validate the behavior against the ticket

• Take screenshots of met/unmet requirements.

2. What you need to provide

To make preview environments work with Baz, you need:

1. A deployable preview environment per PR

This can come from any platform:

• Vercel Deploy Previews

• Netlify Preview Deploys

• GitHub Actions + Docker + any hosting

• Internal preview clusters (if publicly accessible)

2. That preview environment must be reachable

Baz must be able to reach the URL from the public internet.

If your preview is behind a VPN or corporate firewall, you must allowlist Baz’s 3 outbound IPs:

18.190.165.140
3.20.124.148
3.12.220.91

3. Any required login credentials

If users must log in to see your app, Baz needs those credentials.

You configure them inside: Settings → Integrations → Preview Environment

3. Connecting your preview environment in Baz

Step 1 — Open the integration panel

In Baz: Settings → Integrations → Preview Environment → Configure

Step 2 — Enter the login credentials

This is only needed if your preview app is gated behind basic auth or a simple login screen.

• User: the username Baz should log in with

• Password: the password for that user

Click Connect.

If the credentials are valid, you’ll see the “Connected” state:

4. How Baz learns the preview URL

You must give Baz agents the URL of the preview environment in the context of the pull request.

Ideally, you do this by posting a comment on the GitHub PR.

Option A — Your CI posts the URL automatically

This is the recommended approach. After deployment, CI adds a comment like:

### Preview environment is ready
https://cr-1234.yourcompany.com

Baz reads this comment, validates the URL, logs in if needed, and starts Spec Review.

Option B — You paste the URL manually

You can also comment manually on the PR:

Baz run spec review. Preview URL: https://cr-4567.dev.myapp.com

Baz will detect it and run automatically.

FAQ

Where do I get the “preview env URL”?

From your deployment system, not from Baz. Examples: Vercel/Netlify preview deploys, Preevy.dev links, a URL printed by your CI, or a hostname from your internal preview cluster. Once you have that URL, paste it in a PR comment (or have CI post it) and Baz will pick it up.

How do I change or remove the preview environment integration?

Go to Settings → Integrations → Preview Environment → Configure and overwrite the user/password if they changed. If you need the integration fully removed (for example, wrong env or org), contact Baz support; the UI will support delete soon.

How do I know everything is set up correctly?

Use this quick checklist:

• You can deploy your app to a public preview URL (or Baz’s IPs are allowlisted).

• You’ve configured preview-env credentials in Settings → Integrations → Preview Environment (if needed).

• Your CI or a developer posts the preview URL as a PR comment.

When these are in place, Baz will open the URL, authenticate, run Spec Reviewer, and add a report back to the PR.