[BUG] /cost command doesn't show API costs for continued sessions

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?

• The /cost command shows costs from the original session but doesn't update when a session is continued after hitting context limits
• Expected: Cumulative costs including the continuation session
• Actual: Only shows costs from before the session was summarized and continued
• Example: Shows 632 input / 39.1k output when actual usage in continuation is ~43k tokens

In fact, in my terminal session /cost didn't output anything - it wasn't until I asked the model why it was blank that I was able to file this bug.

What Should Happen?

Clause should accurately report api costs regardless of how they started being used.

Error Messages/Logs

Steps to Reproduce

a. Start a long session that hits context limits
b. Continue the session from the summary
c. Run /cost command
d. Observe it shows old costs, not current session costs

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.0.28 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

My pro account limit was reached after only about an hour's worth of use this morning, very disappointing.