[BUG] Regression: Custom slash commands not recognized in VSCode terminal (worked until 2 days ago)

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?

Custom slash commands are no longer recognized when Claude Code is launched from
VSCode's integrated terminal, but work perfectly fine from macOS Terminal.

Environment:

• OS: macOS Darwin 24.6.0
• Working: macOS Terminal
• Not working: VSCode integrated terminal Ver.1.104.0 (Claude Code for VS Code Ver. 1.0.117)
• This was working in VSCode terminal until approximately September 15, 2025 (2

days ago)

There are no differences in environment variables, PATH, etc. between the VSCode terminal and the system terminal.
I have also not updated VSCode.

What Should Happen?

Custom slash commands should work in VSCode terminal as they do in macOS Terminal

Error Messages/Logs

Steps to Reproduce

1. Launch Claude Code from VSCode integrated terminal
2. Try to execute custom slash commands
3. Commands are not recognized

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

1.0.117

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

• Same directory used for both terminals
• No configuration changes made on my end
• Issue appears to be a regression that occurred within the last 2 days