[BUG] Claude Code exits immediately in non-git directories with "Input must be provided" error

Description

Claude Code v2.1.31 exits immediately when launched interactively in a directory that is not a git repository. The error (visible in debug logs) is:

Error: Input must be provided either through stdin or as a prompt argument when using --print

No --print flag is being used. The same command works in git-initialized directories.

Reproduction

mkdir /tmp/test && cd /tmp/test && claude  # exits immediately
git init && claude                          # works

Environment

• Claude Code: 2.1.31
• OS: RHEL 9.7 (also a SLURM HPC environment)
• Shell: bash
• Terminal: /dev/pts/* (confirmed TTY with tty and [ -t 0 ])
• No aliases, no CLAUDECODE env vars set

Debug log observations

• All startup steps complete successfully (setup, MCP, LSP, keybindings, REPL mount)
• Git remote URL: null / No git remote URL found logged
• Process releases PID lock and exits cleanly (exit code 0) ~1s after start
• No signals received (confirmed via strace -e trace=signal)

Related issues

• #12507 — similar HPC stdin issue, but that affects all directories
• #6820 — similar error message, but caused by -- argument parsing

Workaround

Run git init in the directory before launching Claude Code.