Executing Parallel Phase

Overview

Parallel phases enable TRUE concurrent execution via isolated git worktrees, not just logical independence.

Critical distinction: Worktrees are not an optimization to prevent file conflicts. They're the ARCHITECTURE that enables multiple subagents to work simultaneously.

When to Use

Use this skill when execute command encounters a phase marked "Parallel" in plan.md:

• ✅ Always use for N≥2 tasks
• ✅ Always use for N=1 (maintains architecture consistency)
• ✅ Even when files don't overlap
• ✅ Even under time pressure
• ✅ Even with disk space pressure

Never skip worktrees for parallel phases. No exceptions.