gstack

AI makes coding easy, but running a business is hard. Garry Tan, CEO of Y-Combinator, released gstack to cover the complete workflow. With 54,400+ stars on GitHub, it’s one of the fastest-growing developer tools. The diagram below shows the main path.

I am looking at gstack as an engineering system. I care about where work moves, where state is saved, and what happens when one part fails.

System overview

The names change from project to project. The design questions do not. The diagram keeps the main path small so the handoffs are easy to see.

Main components

• Real browser automation enables testing with actual eyes.
• Safety guardrails prevent destructive commands during debugging.
• Parallel development runs multiple AI sessions simultaneously.
• Multi-model review uses different AIs to catch different bugs.
• Structured workflow follows Think→Plan→Build→Review→Test→Ship→Reflect.

Design questions

Before using a system like this with a real team, I would ask:

• Where is state saved? What happens after a restart?
• Which calls are safe to retry? Which ones need an idempotency key or a workflow record?
• What can the agent access? Keep user input, generated code, services, and local credentials in separate trust boundaries.
• How does an operator see a failure instead of finding it later inside a queue or background worker?

The happy path is easy to draw. The hard part is restart, retry, and partial failure.

When it is useful

Use this kind of system when the work repeats and someone needs to inspect what happened. For a one-off task, it may be more machinery than you need.

Source

The project is open source on GitHub. I expanded the original project summary into an engineering note for the Ming Dao School library.