parallel-execution

# Parallel Execution **CRITICAL**: This skill teaches how to execute multiple tasks simultaneously for maximum efficiency. ## The Fundamental Rule > **ALL Task calls MUST be in a SINGLE assistant message for true parallelism.** If Task calls are in separate messages, they run SEQUENTIALLY, not in parallel. --- ## Why Parallel Execution Matters ### Sequential (SLOW - AVOID) ``` Message 1: Start Task A ↓ wait for completion Message 2: Start Task B ↓ wait for completion Message 3: Start Task C ↓ wait for completion Total time = A + B + C = 90 seconds (if each takes 30s) ``` ### Parallel (FAST - USE THIS) ``` Message 1: Start Task A ─┐ Start Task B ─┼─ All run simultaneously Start Task C ─┘ Total time ≈ max(A, B, C) = 30 seconds ``` **Speedup: 3x faster with 3 parallel tasks** --- ## How to Execute in Parallel ### Step 1: Identify Independent Tasks Tasks are independent when: - They don't depend on each other's output - They don't modify the same files - They can run in any order ### Step 2: Launch ALL Tasks in ONE Message ```xml <!-- CORRECT: All tasks in single message = PARALLEL --> <task> <description>Analyze authentication module</description> <prompt>Review src/auth for security patterns...</prompt> </task> <task> <description>Analyze API layer</description> <prompt>Review src/api for REST best practices...</prompt> </task> <task> <description>Analyze database layer</description> <prompt...