Slash-prefixed input (e.g. `/something`) is silently ignored instead of returning an error

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 using the Claude Code VS Code extension, any input starting with a slash (e.g. /test, /something do X) does not produce any response.

It appears that slash-prefixed input is being interpreted as a command. However, when the command is not recognized, there is no fallback behavior or error message, resulting in a silent failure.

This leads to confusion, as the user receives no feedback or indication of what went wrong.

What Should Happen?

One of the following should happen:

1. The input should be treated as normal text and processed by Claude
2. OR an explicit error should be shown (e.g. "Unknown command")

Error Messages/Logs

Steps to Reproduce

1. Open VS Code
2. Open Claude Code extension
3. Enter /something do this task
4. Press Enter
5. Observe that no response is returned

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.72 (Claude Code)

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_