claude --worktree hangs indefinitely on macOS

Description

claude --worktree <name> hangs indefinitely with no output on macOS. The process never starts — no prompt, no error, no debug output even with --debug.

Environment

• Claude Code version: 2.1.81
• OS: macOS (Darwin 25.3.0)
• Shell: zsh (init time ~0.6s)
• Node: v22.14.0

Steps to Reproduce

1. Run claude --worktree test123
2. Observe: hangs with blank screen, no output

Also tried:

• claude --worktree test123 --debug — same hang, no debug output
• Different worktree names (with/without slashes)
• With and without hooks configured
• With 51 existing git worktrees and after reducing to 3 — same behavior

What Works

• claude (without --worktree) starts normally
• git worktree add completes in ~1s
• zsh -i -c 'echo done' completes in ~0.6s
• Agent tool with isolation: "worktree" works perfectly from within a Claude Code session — worktree is created, session runs, results returned

Expected Behavior

claude --worktree <name> should create a worktree and start an interactive session.

Actual Behavior

Process hangs indefinitely with no output. Must be killed with Ctrl+C.