[BUG] 2.0.13 MASSIVE TOKEN USAGE DUE TO SYSTEM REMINDER

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 had Claude editing a large MD file. It was reading just the bits it needed to edit. But EACH EDIT was eating 25 to 50% of the context WINDOW. Reverted to 2.0.10 and now each edit was taking 1% to 2%. Before I reverted I pointed out to Claude the context was being eating massively for no reason I could see and IT told me it was getting the COMPLETE FILE multiple times per edit VIA the SYSTEM REMINDER!!!!!!!!!!!!!!!!!!!!!!!!!!

What Should Happen?

NOT WASTE 25 to 50% of Context on system reminders?

Error Messages/Logs

Steps to Reproduce

Edit a large file with Claude in 2.0.13.

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.0.13

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_