[BUG] Delegate mode hangs on prompt submission (v2.1.2

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 defaultMode is set to delegate in settings.json, Claude Code hangs indefinitely after submitting a prompt. The UI shows the spinner (●) but no response is ever received.

What Should Happen?

• Claude Code version: 2.1.2
• OS: Ubuntu 24.04.3 LTS (running in Proxmox LXC container)
• Kernel: 6.17.4-2-pve
• Installation: Native (~/.local/bin/claude)

Error Messages/Logs

Expected Behavior

  Claude should process the prompt and respond, with delegate mode allowing auto-approval of tool calls.

  Actual Behavior

  The UI hangs showing only the spinner (●). The process remains running (State: R, 15 threads) and is actively writing terminal escape sequences (UI redraws), but never makes API calls for the user's prompt.

  Workaround

  Change defaultMode to default in settings.json.

Steps to Reproduce

1. Set defaultMode to delegate in ~/.claude/settings.json:

```json
"permissions": {
"defaultMode": "delegate"
}

1. Start claude
2. Type any prompt and press Enter
3. Observe: spinner appears but no response is received

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.2

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_