Welcome to the Antigravity Port of gStack.

Originally created by Garry Tan (CEO of Y Combinator), gStack is a framework that encodes decades of Silicon Valley engineering excellence into AI personas. Instead of just "chatting with an AI," you are working with a team of hyper-specialized "Digital Staff" (CEOs, Lead Engineers, Designers) who know exactly how to brainstorm, build, and audit high-growth software.

gStack-Antigravity brings this entire professional brain trust into your local Google Antigravity environment—making it faster, private, and 100% focused on your "vibe coding" journey.

1. Install gStack-Antigravity (30 seconds — see below)
2. Run /office-hours — describe what you're building
3. Run /plan-ceo-review on any feature idea
4. Run /review on any branch with changes
5. Run /qa on your staging URL
6. Stop there. You'll know if this is for you.

Requirements: Antigravity, Git, Bun v1.0+, Node.js (Windows only)

Open Antigravity and paste this. The agent does the rest:

Install gStack-Antigravity: run git clone https://github.com/kimjin8/gstack-antigravity.git ~/.antigravity/skills/gstack && cd ~/.antigravity/skills/gstack && ./gstack-source/browse/setup then add a "gstack" section to your persona instructions that says to use the /browse skill from gstack for all web browsing, never use default browser tools, and lists the available skills: /office-hours, /plan-ceo-review, /plan-eng-review, /plan-design-review, /design-consultation, /review, /ship, /land-and-deploy, /canary, /benchmark, /browse, /qa, /qa-only, /design-review, /setup-browser-cookies, /setup-deploy, /retro, /investigate, /document-release, /codex, /cso, /autoplan, /careful, /freeze, /guard, /unfreeze, /gstack-upgrade. Then ask the user if they also want to add gstack to the current project so teammates get it.

Add gStack-Antigravity to this project: run cp -Rf ~/.antigravity/skills/gstack .antigravity/skills/gstack && rm -rf .antigravity/skills/gstack/.git && cd .antigravity/skills/gstack && ./gstack-source/browse/setup then add a "gstack" section to your project's .antigravity/rules/persona-gstack.md that says to use the /browse skill from gstack for all web browsing, never use default browser tools, lists the available skills: /office-hours, /plan-ceo-review, /plan-eng-review, /plan-design-review, /design-consultation, /review, /ship, /land-and-deploy, /canary, /benchmark, /browse, /qa, /qa-only, /design-review, /setup-browser-cookies, /setup-deploy, /retro, /investigate, /document-release, /codex, /cso, /careful, /freeze, /guard, /unfreeze, /gstack-upgrade, and tells the agent that if gstack skills aren't working, run cd .antigravity/skills/gstack && ./gstack-source/browse/setup to build the binary and register skills.

Real files get committed to your repo (not a submodule), so git clone just works. Everything lives inside .antigravity/. Nothing touches your PATH or runs in the background.

You:    I want to build a daily briefing app for my calendar.
You:    /office-hours
AI:     [asks about the pain — specific examples, not hypotheticals]

You:    Multiple Google calendars, events with stale info, wrong locations.
        Prep takes forever and the results aren't good enough...

AI:     I'm going to push back on the framing. You said "daily briefing
        app." But what you actually described is a personal chief of
        staff AI.
        [extracts 5 capabilities you didn't realize you were describing]
        [challenges 4 premises — you agree, disagree, or adjust]
        [generates 3 implementation approaches with effort estimates]
        RECOMMENDATION: Ship the narrowest wedge tomorrow, learn from
        real usage. The full vision is a 3-month project — start with
        the daily briefing that actually works.
        [writes design doc → feeds into downstream skills automatically]

You:    /plan-ceo-review
        [reads the design doc, challenges scope, runs 10-section review]

You:    /plan-eng-review
        [ASCII diagrams for data flow, state machines, error paths]
        [test matrix, failure modes, security concerns]

You:    Approve plan. Exit plan mode.
        [writes 2,400 lines across 11 files. ~8 minutes.]

You:    /review
        [AUTO-FIXED] 2 issues. [ASK] Race condition → you approve fix.

You:    /qa https://staging.myapp.com
        [opens real browser, clicks through flows, finds and fixes a bug]

You:    /ship
        Tests: 42 → 51 (+9 new). PR: github.com/you/app/pull/42

You said "daily briefing app." The agent said "you're building a chief of staff AI" — because it listened to your pain, not your feature request. Eight commands, end to end. That is not a copilot. That is a team.

gstack is a process, not a collection of tools. The skills run in the order a sprint runs:

Think → Plan → Build → Review → Test → Ship → Reflect

Each skill feeds into the next. /office-hours writes a design doc that /plan-ceo-review reads. /plan-eng-review writes a test plan that /qa picks up. /review catches bugs that /ship verifies are fixed. Nothing falls through the cracks because every step knows what came before it.

gstack is powerful with one sprint. It is transformative with ten running at once.

In the Antigravity environment, you can run multiple agent sessions in parallel — each in its own isolated workspace. One session on /office-hours, another on /review, a third implementing a feature, a fourth running /qa. All at the same time. The sprint structure is what makes parallelism work — without a process, ten agents is ten sources of chaos. With a process, each agent knows exactly what to do and when to stop.

This project is a localized port of the original gstack framework by Garry Tan. We are deeply grateful to Garry and the gstack team for their incredible work in building these powerful engineering personas.

• Original Source: garrytan/gstack
• Philosophy: This port aims to make that same SV-level expertise accessible directly within the Google Antigravity environment, while keeping your work private and local.