False positive: Usage Policy block on lattice gauge theory question Fable 5, v2.1.170) [BUG] Request ID: req_011Cbt6Zpk3Rup3RBX4CjmLq

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?

Asked a pure physics question about why periodic-lattice correlators have a cosh form (mass extraction in lattice gauge theory). Blocked immediately with a Usage Policy error in a fresh session. No security, cyber, or bio content. The identical question is answered normally by Fable 5 on claude.ai. code version

What Should Happen?

claude code should answer question

Error Messages/Logs

Steps to Reproduce

simple question "explain with examples why a single-state correlator has a cosh form because propagation can go both ways around the periodic direction.
Periodic lattice correlators are commonly rewritten in cosh form for mass extraction"

Claude Model

Other

Is this a regression?

Yes, this worked in a previous version

Last Working Version

opus

Claude Code Version

fable-5

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

Other

Additional Information

_No response_