[BUG] Claude Code outputs minified React reconciler source code instead of normal response

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?

Asked Claude Code to edit .claude/settings.json to add an env variable for agent teams. The file edit itself succeeded, but instead of a normal text response, Claude dumped thousands of lines of minified React reconciler/fiber source code (function names like Yb, Ze, BK, lH, RKT, etc.).

What Should Happen?

Expected: Normal text response confirming the edit
Actual: ~700+ lines of minified JavaScript (appears to be React reconciler internals)

Error Messages/Logs

Steps to Reproduce

1. Asked Claude to add CLAUDE_CODE_EXPERIMENTAL_AGENT_TEAMS env block to .claude/settings.json
2. File was edited correctly
3. Response output was minified internal UI framework code instead of confirmation

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

4.6

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

iTerm2

Additional Information

_No response_