[BUG] MAX login fails if claude running in tmux on OSX

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?

I think this may be more of a documentation issue than anything. I've been having the persistent problem of being able to log into claude max from the terminal (or from cursor/vscode). I remembered that prior I had had an OSX keychain problem when running in tmux, and tried logging in from a terminal without tmux, and bam, it worked. Something in tmux appears to interfere with OSX's ability to handle certain keychain operations.

What Should Happen?

Claude should be able to log in when using tmux on osx, or should detect that it can't access the keychain and report to the user that it can't log in on osx if running in tmux

Error Messages/Logs

Steps to Reproduce

1. /logout
2. start up tmux
3. run claude
4. /login, using a max sub

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.0.25

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Other

Additional Information

_No response_