[BUG] Bun can't access npm registry in CC web

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 you use use a repo that uses bun or try to convert an npm repo over to bun, claude close Web can't access the npm registry and will revert you back to NPM.

<img width="1320" height="2400" alt="Image" src="https://github.com/user-attachments/assets/20790340-f54b-41b5-8f16-44d4a66c9894" />

What Should Happen?

Access to NPM registries should be allowed for bun in claude code web

Error Messages/Logs

Http 401 when trying to access npm registries when converting an npm project to bun

Steps to Reproduce

1. Create a new project. Claude will use npm by default.
2. Install some packages
3. Create a new session and ask claude to convert from npm to bun

It will fail due to access

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

Latest web

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Non-interactive/CI environment

Additional Information

_No response_