[BUG] Summaries (e.g. final steps for complex prompts) are truncated and no longer shown.

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?

When you run a multi-step command, sometimes the full summary (e.g. something like "step 5: summarize your work, list out X changes you made, Y things you need approval one, Z things that you were thinking about, etc.", it occasionally gets truncated).

This is intermittent, I believe it is related to a some sort of visible context cleanup in the terminal. It is new in 2.1.90. I have not previously seen this issue in 2.1.89.

What Should Happen?

When a complex prompt finishes that has an output block, that whole output block should be visible when the command stops.

Error Messages/Logs

Steps to Reproduce

Make a multi-step prompt that does a lot (e.g. a prompt telling subagents running "/simplify" in a loop until some outcome is reached might work, but "/simplify" is pretty simple, so maybe find something a bit more complex).

Then run this prompt 100 times. In 10 or so of those times, you will see that the final output is truncated.

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

2.1.89

Claude Code Version

2.1.89

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_