[BUG] Claude Code ignores explicit instructions in command

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?

I wrote a custom command generate-apex-client. I made it very explicit that claude should first check the input before doing anything else. Instead claude code started reading a completely unspecified spec (REALLY SCARY) and started to implement stuff.

It is quite easy to reproduce. Just add the command to your claude code environment and enter /generate-apex-client

generate-apex-client.md

What Should Happen?

Claude should have shown the help for the command and NOT start generating stuff

Error Messages/Logs

Steps to Reproduce

1. Add the command to your claude code environment
2. Enter '/generate-apex-client' in claude
3. See it doesn't stick to the instructions

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

1.0.108

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

IntelliJ IDEA terminal

Additional Information

_No response_