[BUG/NEED_CLARIFY] "Reserved" included 22.5%???

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?

After update claude sonnet 4.5, claude code CLI include "Reserved" in /context with 22.5%. Can team explain more detail about "Reserved"?

<img width="638" height="257" alt="Image" src="https://github.com/user-attachments/assets/7f54afc6-91bc-4098-aece-1e19769e92ba" />

What Should Happen?

Declare in document offical

Error Messages/Logs

Steps to Reproduce

run /context

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.0.1 (Claude Code)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_