[BUG] /clear command leaves 45k token 'autocompact buffer' in context (22.5% usage)

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 running /clear to clear conversation history, the /context command shows that an "autocompact buffer" containing 45k tokens (22.5% of the 200k budget) persists in memory.
This appears to be compacted conversation history that should have been cleared.

What Should Happen?

After /clear, context usage should only include:

• System prompt
• System tools
• Memory files (CLAUDE.md)
• Current message

Total should be ~18-20k tokens maximum.

Error Messages/Logs

Steps to Reproduce

1. Start a fresh Claude Code session
2. Run /clear to clear conversation history
3. Run /context to check context usage

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.0.31 (Claude Code)

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

Xterm

Additional Information

_No response_