[BUG] Interrupted" error mid-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?

• Symptom: "Interrupted" error mid-response, happens on fresh sessions immediately, not user-initiated

What Should Happen?

"Interrupted" error mid-response, happens on fresh sessions immediately, not user-initiated

Error Messages/Logs

- Ruled out: network (0% packet loss, 31ms), hooks (none), CLAUDE.md (removed, same issue), history (cleared), reinstall, permissions fix

Steps to Reproduce

## Steps to Reproduce

1. Install Claude Code 2.1.80 (npm install -g @anthropic-ai/claude-code)
2. Navigate to a project directory with a CLAUDE.md file (~272 lines)
3. Start a new session (claude)
4. Send any multi-step request (e.g., "read dashboard.php and add a feature")
5. Claude begins making tool calls (Read, Bash, etc.)
6. Mid-response, after 2-4 tool calls, the stream is interrupted
7. Shows "Interrupted · What should Claude do instead?"
8. No user input was given — interruption is unprompted

## Environment

• OS: Ubuntu Linux (EC2 instance)
• Claude Code: 2.1.80
• Model: claude-sonnet-4-6
• Network: 0% packet loss, 31ms avg latency to api.anthropic.com

## Troubleshooting already attempted

• Fresh install / reinstall
• Cleared ~/.claude/history.jsonl
• Removed CLAUDE.md
• No hooks configured
• Fixed malformed permissions in settings.local.json
• /clear between attempts
• Happens on first message of fresh sessions

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.80

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

Terminal.app (macOS)

Additional Information

## Steps to Reproduce

1. Install Claude Code 2.1.80 (npm install -g @anthropic-ai/claude-code)
2. Navigate to a project directory with a CLAUDE.md file (~272 lines)
3. Start a new session (claude)
4. Send any multi-step request (e.g., "read dashboard.php and add a feature")
5. Claude begins making tool calls (Read, Bash, etc.)
6. Mid-response, after 2-4 tool calls, the stream is interrupted
7. Shows "Interrupted · What should Claude do instead?"
8. No user input was given — interruption is unprompted

## Environment

• OS: Ubuntu Linux (EC2 instance)
• Claude Code: 2.1.80
• Model: claude-sonnet-4-6
• Network: 0% packet loss, 31ms avg latency to api.anthropic.com

## Troubleshooting already attempted

• Fresh install / reinstall
• Cleared ~/.claude/history.jsonl
• Removed CLAUDE.md
• No hooks configured
• Fixed malformed permissions in settings.local.json
• /clear between attempts
• Happens on first message of fresh sessions