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Codex introduced new capabilities for creating and managing threads across projects and tasks, including orchestration of worktrees and use of subagents for parallel tasks.
LukeDing14 points out that many people still don't use Codex correctly for projects, and recommends the learn-harness-engineering resource along with his own harness file, sharing tips for efficient coding and project organization.
An engineering guide on how to efficiently organize the .claude/ directory in a Claude Code project, covering the target structure, core principles, division of folders, and a progressive growth path.