[BUG] macOS: claude:// protocol handler fails to activate in native full screen mode

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?

The claude:// protocol handler fails to open Claude Desktop when the browser is in macOS native full screen mode. After completing OAuth authentication in a web browser (in full screen mode), the redirect to claude:// does not activate the Claude Desktop app. The browser shows the "Open Claude?" popup, but clicking "Open" does nothing - the app never receives focus or opens.
Key observation: The same flow works perfectly with Cursor IDE (cursor:// protocol). When authenticating to a Cursor-based MCP server in full screen mode, clicking "Open Cursor" successfully opens the Cursor app.

What Should Happen?

When a user completes OAuth authentication in a web browser and the page redirects to claude://..., Claude Desktop should open and receive the authentication callback — regardless of whether the browser is in macOS native full screen mode or not.
Specifically:

1. The browser shows "Open Claude?" confirmation dialog
2. User clicks "Open" (or "Allow")
3. Claude Desktop should immediately:

• Receive focus (switch to the app)
• Process the claude:// URL with auth parameters
• Complete the MCP server connection

This should work identically to how Cursor IDE handles cursor:// redirects — which successfully opens even when the browser is in macOS native full screen mode.

Error Messages/Logs

Steps to Reproduce

1. Put Safari/Chrome in macOS native full screen mode (green button)
2. Navigate to an MCP OAuth flow that redirects to claude://claude.ai/settings/connectors?...
3. Complete the authentication
4. When prompted "Open Claude?", click Open
5. Expected: Claude Desktop opens and receives the auth callback
6. Actual: Nothing happens. Claude Desktop does not open.

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

1.1.1520

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

Info.plist could be the cause?