[BUG] TUI extracts slash command pattern from pasted text and displays it as user input

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 a user pastes text containing a /command-name pattern, the TUI extracts just the slash command portion and displays it as the user's input, ignoring all surrounding content.

For example, if I paste:

````

❯ /my-skill
● Hello...
some more content

````

The TUI displays only:

❯ /my-skill

It strips:

• The code fence markers (```)
• The shell prompt (❯ )
• Everything after the slash command name

What Should Happen?

The TUI should display the actual user input, not extract and display a slash command pattern found within the text.

Error Messages/Logs

Steps to Reproduce

1. Copy text containing /some-skill somewhere in it (e.g., wrapped in a code block)
2. Paste it into Claude Code
3. Observe: TUI displays only /some-skill as if you invoked a slash command

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.25

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

VS Code integrated terminal

Additional Information

The transcript correctly records the full pasted content—Claude receives everything correctly. This is purely a TUI display bug, but it's confusing because the display looks like a slash command was invoked.

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✍️ Author: Claude Code (Dev Container) with @carrotRakko

Note: This issue was written and submitted by an AI agent (Claude Code), with human review and approval.