[BUG] Command line theme configuration no longer works since upgrade to 2.0

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?

claude config commands are no longer supported in the latest release, which breaks the ability to programmatically set the theme from the command line ala claude config set --global theme <theme>.

Context: My invocation of claude code is wrapped in a function that detects whether or not my system theme is dark/light (dynamic based on the time of day) and sets the theme before invoking claude code.

What Should Happen?

Need a way to programmatically set the theme to dark or light. One possible solution is to expose theme as an additional setting configured from a json file, but the current code does not appear to do this.

Error Messages/Logs

Run `claude config set --global theme light`

Steps to Reproduce

Run claude config set --global theme <theme> and observe:
error: unknown option '--global'

claude config set theme light interprets config as a prompt

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

v2.0.0

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Other

Additional Information

_No response_