[BUG] Unicode Character Input Corruption in Claude Code Terminal

[hungho66]

Environment

• Platform: Anthropic Max subscription
• Claude CLI version: 1.0.84 (Claude Code)
• Operating System: Windows 11
• Terminal: VS Code integrated terminal
• Node.js version: v22.17.0
• Locale: en_US.UTF-8

Bug Description

Claude Code terminal corrupts Unicode characters when typing directly in the interactive chat interface. ASCII characters work perfectly, but any Unicode characters (accented letters, non-Latin scripts, emojis) become garbled or display incorrectly.

Steps to Reproduce

1. Open Claude Code in VS Code terminal: claude
2. Try typing text with Unicode characters:
   • Vietnamese: xin chào, tôi cần giúp đỡ
   • French: café, résumé, naïve
   • Spanish: niño, señor, mañana
   • German: Müller, Größe, weiß
3. Observe character corruption/display issues

Expected Behavior

Unicode characters should display and be processed correctly, just like in regular terminal or VS Code editor.

Actual Behavior

• Unicode characters appear corrupted, as question marks, or as mojibake
• Input becomes unreadable for non-ASCII content
• Only ASCII/English characters work properly
• Issue affects all languages with diacritics and special characters

Additional Context

• Regular VS Code terminal handles Unicode perfectly
• Issue only occurs within Claude Code interactive session
• Problem persists after setting UTF-8 encoding in VS Code settings
• Affects international users across multiple languages
• Related to existing UTF-8 corruption issues: [BUG] UTF-8 Corruption Bug #1716, [BUG] MultiEdit UTF-8 Encoding Bug Report #2154, Character Encoding Handling Fails for WINDOWS-1252 ADVPL Files #3416

[github-actions]

Found 3 possible duplicate issues:

1. Unicode Input Handling Fails for Vietnamese Characters #3961
2. [BUG] Unicode box-drawing characters Γò¡ΓöÇΓöÇΓöÇΓ #4404
3. Typing Input Duplication and Erratic Character Rendering #2645

This issue will be automatically closed as a duplicate in 3 days.

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🤖 Generated with Claude Code

[github-actions]

This issue has been automatically closed as a duplicate of #3961.

If this is incorrect, please re-open this issue or create a new one.

🤖 Generated with Claude Code

[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.