[BUG] Agent Task Output Files Were All 0 Bytes Despite the Tasks Showing "completed" Status

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 agent output files were all 0 bytes because of the auto-compact process. The main process went to retrieve the task output files after the auto-compact process and they were now all zero byte files.

What Should Happen?

The results files from the agent should survive an auto-compaction.
Agent(Las Vegas Aug 13-21 activity research)
⎿  Done (31 tool uses · 86.6k tokens · 7m 3s)

Error Messages/Logs

All the output files from the prior session's agents are empty (the results were delivered only through the context that got compacted). I'll re-run the full Las Vegas research now as a foreground agent so the results come back directly.

Steps to Reproduce

Unsure

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.177 (Claude Code)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

_No response_