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Context Window Limits
One agent juggling 5 tasks = confused agent. Each task needs full codebase context.
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Serial = Slow
5 tasks × 15 min each = 75 min serial. In parallel? Still ~15 min total.
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Blast Radius
One agent, one branch = merge conflicts with itself. Isolated worktrees = clean merges.
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Task Clarity
Single-task agents need shorter prompts, make fewer mistakes, and are easier to review.