New App "Crystal" to spwn multiple Claude Threads

# Parallel Claude Code Sessions with Crystal ## The Problem Claude Code is powerful, but it's single-threaded. Complex projects have independent work streams that could run in parallel—backend, frontend, AI integration—but you're stuck doing them sequentially. ## The Solution: Git Worktrees + Crystal **Git worktrees** let you check out multiple branches simultaneously in separate directories: ```bash git worktree add ../worktree-backend -b feature/backend git worktree add ../worktree-frontend -b feature/frontend git worktree add ../worktree-ai -b feature/ai-integration ``` **Crystal** ([github.com/stravu/crystal](https://github.com/stravu/crystal)) is a desktop app that manages multiple Claude Code sessions visually. Point each session at a different worktree. ## The Pattern: Coordinator + Workers Run one "coordinator" Claude session in your main repo. This session: - Tracks progress in a ROADMAP.md - Completes ticket workflows (push, MR, merge) when workers finish - Assigns next tickets to available streams - Handles merge conflicts between streams Worker sessions just implement tickets. They don't update shared docs (avoids conflicts). ## Example Workflow 1. Coordinator creates worktrees and ROADMAP 2. Launch Crystal, create sessions for each worktree 3. Give each worker a prompt: "Work ticket #19" 4. Workers implement, test, push, create MR 5. Coordinator merges, updates ROADMAP, assigns next ticket 6. Repeat ## Tips - Keep shared file ownership clear (one stream owns `package.json`, another owns `appsettings.json`) - Workers should pull main before starting new tickets - Put automation scripts in git so all worktrees have them - Coordinator handles ROADMAP updates to avoid merge conflicts Five parallel Claude sessions can massively accelerate a project. The coordination overhead is worth it.