[BUG] Code block copy-paste injects formatting characters that break bash

Preflight Checklist

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

What's Wrong?

When copying code blocks from Claude Code output (web, desktop app, or mobile),
invisible or visible formatting characters (angle brackets, special quotes, etc.)
get included in the clipboard. Pasting into a terminal causes:

-bash: syntax error near unexpected token `|'

This happens consistently across:

• Claude Code web (claude.ai/code)
• Claude Code desktop app (Mac)
• Mobile browser

Steps to reproduce:

1. Claude outputs a bash command like: docker compose -f file.yml up -d
2. Copy the command from the output (url gets characters < and > around it)
3. Paste into terminal
4. Bash throws syntax error due to invisible formatting characters

Expected: Clean plaintext copy with no formatting artifacts
Actual: Formatting characters included in clipboard

This is particularly painful for users running commands on remote servers
via SSH on mobile.

What Should Happen?

When copy pasting from the code section of Claude, characters breaking the commands, should not happen in the code block.

curl http://www.dsffedsrf.com/
Not
curl <http://www.dsffedsrf.com/>

Expected: Clean plaintext copy with no formatting artifacts
Actual: Formatting characters included in clipboard

Error Messages/Logs

-bash: syntax error near unexpected token `|'

Steps to Reproduce

Steps to reproduce:

1. Claude outputs a bash command like: docker compose -f file.yml up -d
2. Copy the command from the output (url gets characters < and > around it)
3. Paste into terminal
4. Bash throws syntax error due to invisible formatting characters

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

Claude Code 2.1.96

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Other

Additional Information

_No response_