Architecture Development Notes

Oct 21, 2026 · Artificial Intelligence

Claude Code 2.1.302: Fork Subagents Default On — Batch Tasks Lose Automatic Isolation

Claude Code 2.1.302 enables fork subagents by default in headless and editor entry points, breaking the assumption that batch subtasks run in isolated contexts; the article details trade-offs between fork (shared history, tools, model, cache, permissions) and custom subagents (fresh context, configurable tools/model), and guides choosing based on whether subtasks need shared context or independent isolation.