[BUG] Slash command auto-submits on click before user can type arguments

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?

Environment: VSCode extension (desktop app)

Describe the bug
When selecting a slash command from the dropdown (e.g. /wiki-ingest, /grilling),
the message is submitted immediately on click — before the user has any opportunity
to type additional arguments or context.

What Should Happen?

Expected behavior
Selecting a slash command should populate the input field with the command text,
allowing the user to add arguments before pressing Enter to submit.

Error Messages/Logs

No error messages

Steps to Reproduce

Steps to reproduce

1. Open the Claude Code input field in the VSCode extension
2. Type / to open the slash command dropdown
3. Click any command from the dropdown
4. Observe: message is sent immediately

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.223 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

VS Code integrated terminal

Additional Information

I use the VS Code Chat Function to chat with Claude Code, not the Terminal.