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claude-code - 💡(How to fix) Fix Conversation titles are generated in English despite language: "japanese" setting [1 comments, 2 participants]

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anthropics/claude-code#48391•Fetched 2026-04-16 07:01:30
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Conversation/session titles are automatically generated in English even when the language setting is configured to "japanese" in ~/.claude/settings.json.

Root Cause

Conversation/session titles are automatically generated in English even when the language setting is configured to "japanese" in ~/.claude/settings.json.

Code Example

{
  "language": "japanese",
  ...
}

---

- 日本語でのコミュニケーションを基本とする
- 会話のタイトル（件名）も必ず日本語で生成すること
- 英語のタイトルは使わない
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Description

Conversation/session titles are automatically generated in English even when the language setting is configured to "japanese" in ~/.claude/settings.json.

Configuration

settings.json:

{
  "language": "japanese",
  ...
}

CLAUDE.md also explicitly instructs:

- 日本語でのコミュニケーションを基本とする
- 会話のタイトル（件名）も必ず日本語で生成すること
- 英語のタイトルは使わない

Current Behavior

  • Responses within conversations are correctly in Japanese
  • However, auto-generated conversation titles in the sidebar are often in English
  • Examples of English titles that should be Japanese:
    • "Review past project experiences"
    • "Auto-update monthly form options da..."
    • "Add user authentication to web applic..."

Expected Behavior

When language is set to "japanese", conversation titles should also be generated in Japanese.

Environment

  • Platform: macOS (Darwin 25.3.0)
  • Claude Code (Desktop app)

extent analysis

TL;DR

The issue can likely be resolved by ensuring the language setting is correctly applied to conversation title generation in the Claude Code Desktop app.

Guidance

  • Verify that the language setting in ~/.claude/settings.json is correctly set to "japanese" and that the file is being read by the app.
  • Check if there are any other configuration files or environment variables that might be overriding the language setting.
  • Review the CLAUDE.md instructions to ensure that all requirements for Japanese communication are being met, including generating conversation titles in Japanese.
  • Test the app with different language settings to see if the issue is specific to Japanese or a more general problem with language handling.

Example

No code snippet is provided as the issue seems to be related to configuration and settings rather than code.

Notes

The issue might be related to how the Claude Code Desktop app handles language settings or generates conversation titles. Without more information about the app's internal workings, it's difficult to provide a more specific solution.

Recommendation

Apply workaround: Until the issue is fully resolved, manually translating and setting conversation titles in Japanese might be necessary to ensure compliance with the CLAUDE.md instructions.

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