[BUG] Plan Mode Clear Context deletes all previous conversations

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?

Maybe I'm misunderstanding Plan Mode's "clear context" option, but is it supposed to delete ALL conversations, and not just the plan mode's context? Is this intended behavior?

I noticed this happening since I couldn't ESC to previous chats - I had to use /resume.

For example I have 173K tokens used for the previous convo:

<img width="1725" height="939" alt="Image" src="https://github.com/user-attachments/assets/42e6fe9a-1c91-4776-a703-fa0c916c7290" />

Then, I start plan mode via SHIFT TAB and at the end:

<img width="2781" height="480" alt="Image" src="https://github.com/user-attachments/assets/1427a906-c35a-49a0-84f3-973457f04beb" />

I select option 2 (default in CC) and get 278K tokens used (so plan mode used 100K ish tokens)

<img width="1534" height="727" alt="Image" src="https://github.com/user-attachments/assets/29c8ee44-1d2e-43ed-8563-3297503775b0" />

If you select option 1, my expectation was the 100K tokens for plan mode get wiped, and only the plan (around 3K tokens gets appended after my previous convo so 176K tokens gets used)

But in actuality:

<img width="1774" height="785" alt="Image" src="https://github.com/user-attachments/assets/f4cd636b-b62a-4136-bbe3-606a1fa6ac62" />

The entire convo history gets cleared, and 3K of the plan is left. My expectation was the previous convo would still be there.

I thought I was doing something wrong so I used the normal non clear context, and the context length expanded by 100K which was NOT what I expected.

What Should Happen?

Plan mode clear context should only clear the plan mode's context, NOT previous convos.

Error Messages/Logs

Steps to Reproduce

Use CC for like a few turns then use Plan Mode and test Clear Context and not Clear Context

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.114

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

Xterm

Additional Information

_No response_