Ask the agent to start the application and tell you its port. Open the workspace, then click the globe button, Preview a port.

The workspace preview button and port picker. Desktop app · sample data. Select to enlarge.

1. Open the running application

Enter the port, such as 3000, and click Open. The preview appears in a tab beside the conversation. Firetower routes it through the control plane; the worker does not need a public port.

The running application inside Firetower. Desktop app · sample data. Select to enlarge.

Use Full width, Tablet or Phone to check different layouts.

2. Annotate the page

Click Annotate, then click an element in the application. Describe what should change and click Keep this note.

Writing a note on the preview’s checkout button. Desktop app · sample data. Select to enlarge.

3. Send the notes and check the result

Preview notes ready to send to the agent. Desktop app · sample data. Select to enlarge.

Review the notes in the right panel. Click Send notes to the agent; the button shows how many notes will be sent. After the agent makes the change, reload the preview and check it.

Share access

A preview uses a signed URL. Anyone opening it still needs a network route to your Firetower installation. The application’s own sign-in may also apply.

If the preview stops

Check that the service is running on the selected port and the worker is reachable. Ending the workspace stops its running preview. A saved artifact is a separate output.