[BUG] Github MCP Authenticating not shows confirm page in browser

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?

Can't auth to github mcp it's not oppens me url in a browser and I don't have any urls to go manualy so I can't connect to mcp.

<img width="910" height="253" alt="Image" src="https://github.com/user-attachments/assets/66f34584-e743-4db9-96bf-6e580f932460" />

What Should Happen?

When I am choosing Auth to mcp it must popup me in a browser or simply make link where I can manually click to it.

<img width="950" height="359" alt="Image" src="https://github.com/user-attachments/assets/515e8516-6842-4beb-af27-a9f488fcb9dd" />

Error Messages/Logs

Steps to Reproduce

1. Add github mcp
2. /mcp
3. choose github
4. Authenticate

Claude Model

Other

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

2.1.63 (Claude Code)

Platform

Other

Operating System

Windows

Terminal/Shell

WSL (Windows Subsystem for Linux)

Additional Information

Just add link in footer to Authenticate github if it's not redirects to a browser on WSL