What this case covers
The author summarizes a method for one person to direct multiple Codex windows to develop a complete product, organizing engineering through main-control decomposition, serial foundation work, concurrency, integration, and acceptance.
Questions it answers
- Why do large projects get stuck?
- What is the difference between multiple windows and Worktree?
- Which tasks cannot be run concurrently?
- How does the main-control Agent split the Spec?
- How should the integration acceptance window be set up?
Our observations
- The bottleneck in solo development shifts from writing code to engineering management.
- Stabilizing public interfaces before concurrency can significantly reduce merge conflicts.
- The clearer the responsibilities of execution windows, the less AI freely guesses.
From the author
The correct order is to first see the dependencies clearly, determine task boundaries, and then decide which tasks are worth entering Worktree.