[BUG] Interactive TUI exits immediately with stdin EOF since ~v2.1.30 (works in v2.1.25)

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?

Claude Code's interactive TUI launches, renders the welcome screen successfully, but immediately exits without accepting any input. The process terminates cleanly (exit code 0) rather than crashing.

What Should Happen?

Pipe mode works fine

echo "hello" | claude -p "say hi"
# → "Hello! How can I help you today?" — works correctly

This confirms API connectivity, authentication, and the Node.js runtime are all functional. The issue is isolated to the interactive TUI's stdin handling.

Debug log observations

From claude --debug, the last significant entries before exit:

[DEBUG] Watching for changes in setting files /home/Username/.claude...
[DEBUG] High write ratio: blit=0, write=1189 (100.0% writes), screen=...

The blit=0, write=1189 (100.0% writes) line appears twice, indicating the Ink renderer is doing full redraws with no differential updates, though this may be unrelated.

Error Messages/Logs

### strace analysis

The TUI exits because `read(0, ...)` returns 0 (EOF) on stdin:


410756 read(0, "", 24576)  = 0
410757 read(0, "", 20480)  = 0


The process then performs a clean shutdown, restoring terminal settings via `ioctl(TCSETS)` with `icanon echo` and calling `exit_group(0)`.

This suggests a regression in how the TUI sets up or reads from stdin in raw mode. The same terminal/pty/SSH configuration works perfectly with v2.1.25.

Steps to Reproduce

Steps to Reproduce

1. SSH into a Linux server from any SSH client
2. Run claude (native installer, v2.1.30+)
3. TUI renders (logo, welcome message, prompt all visible)
4. Process immediately exits back to shell — no input accepted

Environment

• OS: Linux (HPC server environment)
• Filesystem: Lustre (home directory), tested also from local /tmp — same result
• Terminal: TERM=xterm-256color, terminal size 48×166
• TTY: /dev/pts/64 (proper pty allocated)
• SSH clients tested: Windows PowerShell OpenSSH, MobaXterm — same behavior on both
• tmux: Not used (also tested without tmux, same result)
• Installation: Native installer
• Claude Code version: v2.1.37 (broken), v2.1.25 (working)

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

2.1.25

Claude Code Version

2.1.37

Platform

Anthropic API

Operating System

Other Linux

Terminal/Shell

PowerShell

Additional Information

_No response_