claude-code - 💡(How to fix) Fix [BUG] CC Terminal display corrupted with garbled characters throughout every single session

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?

The terminal displays severe text corruption affecting all output:

1. Command prompts and user input - The shell prompt and commands you type appear as random symbols and unreadable characters
2. All Claude Code output - Every line of assistant response, system messages, and status updates renders as gibberish instead of readable English text
3. Table/box drawing characters - What should be clean ASCII table borders appear as corrupted line-drawing symbols
4. Persistent across entire session - The corruption affects everything from start to finish - there are no readable sections Examples of the bug reproduced locally: <img width="1457" height="721" alt="Image" src="https://github.com/user-attachments/assets/b9a3aa90-cbb7-4e89-aa42-65e758eaf891" />

What Should Happen?

All terminal text should display as clean, readable ASCII/UTF-8 characters with:

• Proper English text for assistant responses
• Clean table borders and formatting
• Readable git statistics and file information
• Normal shell prompt and command echo

Error Messages/Logs

Steps to Reproduce

1. Open claude code inside terminal
2. Run claude --dangerously-skip-permissions
3. Interact with claude code on opus 4.7, 1M
4. It's worth noting, I ran multiple /goal commands
5. After running a few commands, bug will start to appear across all local claude code terminal sessions.

Claude Model

Opus

Is this a regression?

No, this never worked

Last Working Version

No response

Claude Code Version

Claude Code is up to date (2.1.142)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Cursor

Additional Information

Cc' @bcherny; Note: this error never happened across many many versions of CC in terminal, but started to appear in sessions I've invoked the new /goal. Don't have concrete evidence to support but a suspicion to report :)