/config language setting does not persist — always reverts to 'default english'

[donghwahwang]

Bug Description

When changing the language setting to "Korean" via the /config dialog, the setting does not persist. Upon reopening /config, the language always shows "default english" again.

Steps to Reproduce

1. Run /config in Claude Code CLI
2. Change language setting from "default english" to "Korean"
3. Close the config dialog
4. Run /config again
5. Language setting has reverted back to "default english"

Expected Behavior

The language setting should persist across sessions after being changed via /config.

Actual Behavior

The language setting always reverts to "default english". Checking ~/.claude/settings.json and ~/.claude/settings.local.json shows no language field is being saved.

Environment

• OS: macOS (Darwin 25.3.0)
• Claude Code: Latest version
• Shell: zsh

Workaround

Using CLAUDE.md project instructions to enforce language preference works as expected. Only the /config UI setting fails to persist.

[yurukusa]

Fix: set language directly in settings.json

jq '.language = "ko"' ~/.claude/settings.json > /tmp/s.tmp && mv /tmp/s.tmp ~/.claude/settings.json

모든 응답을 한국어로 해주세요. 기술 용어는 영어로 유지해도 됩니다.

This ensures Korean output regardless of the /config setting. CLAUDE.md is loaded every session and doesn't rely on the config persistence mechanism.

[github-actions]

Closing for now — inactive for too long. Please open a new issue if this is still relevant.

[github-actions]

This issue has been automatically locked since it was closed and has not had any activity for 7 days. If you're experiencing a similar issue, please file a new issue and reference this one if it's relevant.