[BUG] Opus 5 freaks out at mere mentioning of .NET Reactor

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?

This magic phrase triggers Opus 5:

"Yes. We need to remove PDBs. Speaking of obfuscation - I have .NET Reactor v6.9.8.0 here."

So we merely mention absolutely legit obfuscation tool, and that's it, we are the enemies of America.

P.S. Opus 5 is an idiot anyway.

What Should Happen?

Nothing

Error Messages/Logs

Opus 5 (1M context)'s safeguards flagged this message. Our intentionally broad safeguards allow us to deliver more capabilities faster, but can sometimes flag legitimate coding, cybersecurity, and biology tasks. Send feedback with /feedback or learn more

Steps to Reproduce

Just mention .NET Reactor

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.220

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

_No response_