[BUG] Cluade code ignores XDG Base Directory specification

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 creates .claude artefacts in the user's home directory instead of following the XDG Base Directory specification on Linux.

<img width="1329" height="563" alt="Image" src="https://github.com/user-attachments/assets/2b041f07-33d3-4e20-99e0-1c8a44bbfc30" />

What Should Happen?

It should follow XDG Base Directory specification, creating artefacts in XDG_CONFIG_HOME or/and XDG_DATA_HOME directories.

See https://wiki.archlinux.org/title/XDG_Base_Directory#User_directories for more information.

Error Messages/Logs

Steps to Reproduce

Install VSCode claude-code extension and connect it to your account (initialize it).

Claude Model

Sonnet (default)

Is this a regression?

No, this never worked

Claude Code Version

2.0.42

Platform

Anthropic API

Operating System

Other Linux

Terminal/Shell

Other