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claude-code - 💡(How to fix) Fix [BUG] Language instruction in CLAUDE.md ignored — responses randomly switch to Japanese/Korean [1 comments, 2 participants]

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anthropics/claude-code#60566•Fetched 2026-05-20 03:55:15
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Error Messages/Logs

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Preflight Checklist

  • I have searched existing issues and this hasn't been reported yet
  • This is a single bug report (please file separate reports for different bugs)
  • I am using the latest version of Claude Code

What's Wrong?

Despite CLAUDE.md specifying "永遠用繁體中文回覆" (Always respond in Traditional Chinese), responses randomly switch to Japanese or Korean mid-session without any trigger.

What Should Happen?

All responses should be in Traditional Chinese throughout the entire session, as instructed in CLAUDE.md.

Error Messages/Logs

Steps to Reproduce

No consistent reproduction steps found. Confirmed conditions when it occurred:

  • No Japanese or Korean content was pasted in the conversation
  • No subagents were invoked
  • No context compaction occurred
  • CLAUDE.md was not modified recently
  • Happened across multiple separate sessions over 2 days (Japanese), and again today (Korean)

Claude Model

None

Is this a regression?

No, this never worked

Last Working Version

No response

Claude Code Version

2.1.144（Claude Code）

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

No response

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#api#output truncation#response parsing#generation error#database connection

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claude-code - 💡(How to fix) Fix [BUG] Language instruction in CLAUDE.md ignored — responses randomly switch to Japanese/Korean [1 comments, 2 participants]