[BUG] when claude uses bash tool to grep a file that returns a single big line (1.5MB) will hang the app.

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 Claude Code attempts to read a file with big lines (ex, big obfuscated js file with a single 1.5 mb line), Claude Code will hang.

What Should Happen?

It should detect there's too much context as it does for other tools

Error Messages/Logs

Let me search for more context about these APIs.

  Bash(grep -B3 -A10 "GetNonWarehouseInventory\|GetStoreResultSet"
      "/Users/pons/projects/***/js_app.js?v=202512092024" 2>/dev/null | head -100)
  ⎿  Running…


then it hangs

Steps to Reproduce

Create a file with a single line of 1.5mb
Get claude code to use grep to read the file
Claude Code will hang

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.9

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Other

Additional Information

_No response_