Enhancement: Tmux integration for /parallel-work

[evansenter]

Summary

Enhance /parallel-work start to optionally auto-create a tmux pane or window for the new worktree session.

Current Behavior

When running /parallel-work start <branch>, the user must manually:

1. Open a new terminal
2. cd to the worktree directory
3. Run claude with the context prompt

Proposed Behavior

Add tmux integration that automatically:

1. Creates a new tmux pane or window
2. Changes to the worktree directory
3. Starts a claude session with the context

Implementation Ideas

Option 1: New Subcommand

/parallel-work start <branch> --tmux-pane    # Split current window
/parallel-work start <branch> --tmux-window  # New window in session

Option 2: AskUserQuestion Choice

After creating the worktree, ask:

• "Open in new tmux pane (Recommended)"
• "Open in new tmux window"
• "Manual - I'll open it myself"

Technical Considerations

• Detect if running inside tmux ($TMUX env var)
• Use tmux split-window -c <worktree-path> for pane
• Use tmux new-window -c <worktree-path> for window
• Send the claude startup command: tmux send-keys "claude 'See .parallel-context.md'" Enter

Open Questions

1. Should this be opt-in (flag) or default behavior when in tmux?
2. Preferred default: pane or window?
3. Should we support non-tmux terminals (iTerm2 tabs, Terminal.app)?

Related

• /parallel-work command added in feat: Add /parallel-work command for multi-PR development #38