[BUG] In-app browser URL bar in Claude Desktop reverts/clears after typing a localhost URL during Claude Code sessions

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

When using the in-app (built-in) browser pane in the Claude Desktop app on macOS during a Claude Code session, typing a URL into the address bar does not navigate — the bar reverts to the empty "Type a URL" placeholder state instead of loading the page.

https://github.com/user-attachments/assets/98fac825-6097-41d5-aa97-80ab154b0943

What Should Happen?

The browser should navigate to the typed URL and load the page, same as a normal browser address bar.

Error Messages/Logs

Steps to Reproduce

1. Start a Claude Code session in the Claude Desktop app (macOS) with a local dev server running (e.g. localhost:3030/app).
2. Open the in-app browser pane (new tab).
3. Click into the URL bar and type a local URL, e.g. localhost:3030/app.
4. Observe the URL bar clears back to the "Type a URL" placeholder and no navigation occurs — the page never loads.

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

Claude 2.2553.1 (c38127) 2026-09-18T00:41:58.000Z

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_