gstack

gstack

gstack turns Claude Code (and other coding agents) into a virtual engineering team: a CEO who rethinks the product, an eng manager who locks architecture, a designer who catches AI slop, a reviewer who finds production bugs, a QA lead who opens a real browser, a security officer who runs OWASP + STRIDE audits, and a release engineer who ships the PR. All slash commands, all Markdown, all free, MIT license.

I'm Garry Tan, President & CEO of Y Combinator. This is the open source software factory I use every day, and I'm sharing it because these tools should be available to everyone. The story, the productivity numbers and how I run ten sprints at once are in Why gstack.

Fork it. Improve it. Make it yours. And if you want to hate on free open source software — you're welcome to, but I'd rather you just try it first.

Who this is for:
- Founders and CEOs — especially technical ones who still want to ship
- First-time Claude Code users — structured roles instead of a blank prompt
- Tech leads and staff engineers — rigorous review, QA, and release automation on every PR

Quick start

1. Install gstack (two pastes, about 30 seconds of setup; see below).
2. Run /office-hours and describe what you're building. It pushes back on your framing and writes a design doc the other skills read.
3. Run /review on any branch with changes. It finds the bugs that pass CI but break in production, and fixes the obvious ones.
4. Run /qa on your staging URL, or on an isolated local API, CLI, job or webhook. It opens a real browser, reproduces bugs and fixes them.

Stop there. You'll know if this is for you. When you want the whole sprint, /autoplan reviews a plan end to end and /ship runs tests, review and the PR.

Install — about 30 seconds

Requirements: Claude Code, Git, Bun…