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# Conflicts:
#	.agents/skills/gstack-browse/SKILL.md
#	.agents/skills/gstack-design-review/SKILL.md
#	.agents/skills/gstack-qa/SKILL.md
#	.agents/skills/gstack-setup-browser-cookies/SKILL.md
#	.agents/skills/gstack/SKILL.md
#	README.md
#	browse/src/cli.ts
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# gstack
Hi, I'm [Garry Tan](https://x.com/garrytan). I'm President & CEO of [Y Combinator](https://www.ycombinator.com/), where I've worked with thousands of startups including Coinbase, Instacart, and Rippling when the founders were just one or two people in a garage — companies now worth tens of billions of dollars. Before YC, I designed the Palantir logo and was one of the first eng manager/PM/designers there. I cofounded Posterous, a blog platform we sold to Twitter. I built Bookface, YC's internal social network, back in 2013. I've been building products as a designer, PM, and eng manager for a long time.
> "I don't think I've typed like a line of code probably since December, basically, which is an extremely large change." — [Andrej Karpathy](https://fortune.com/2026/03/21/andrej-karpathy-openai-cofounder-ai-agents-coding-state-of-psychosis-openclaw/), No Priors podcast, March 2026
And right now I am in the middle of something that feels like a new era entirely.
When I heard Karpathy say this, I wanted to find out how. How does one person ship like a team of twenty? Peter Steinberger built [OpenClaw](https://github.com/openclaw/openclaw) — 247K GitHub stars — essentially solo with AI agents. The revolution is here. A single builder with the right tooling can move faster than a traditional team.
In the last 60 days I have written **over 600,000 lines of production code** — 35% tests — and I am doing **10,000 to 20,000 usable lines of code per day** as a part-time part of my day while doing all my duties as CEO of YC. That is not a typo. My last `/retro` (developer stats from the last 7 days) across 3 projects: **140,751 lines added, 362 commits, ~115k net LOC**. The models are getting dramatically better every week. We are at the dawn of something real — one person shipping at a scale that used to require a team of twenty.
I'm [Garry Tan](https://x.com/garrytan), President & CEO of [Y Combinator](https://www.ycombinator.com/). I've worked with thousands of startups — Coinbase, Instacart, Rippling — when they were one or two people in a garage. Before YC, I was one of the first eng/PM/designers at Palantir, cofounded Posterous (sold to Twitter), and built Bookface, YC's internal social network.
**gstack is my answer.** I've been building products for twenty years, and right now I'm shipping more code than I ever have. In the last 60 days: **600,000+ lines of production code** (35% tests), **10,000-20,000 lines per day**, part-time, while running YC full-time. Here's my last `/retro` across 3 projects: **140,751 lines added, 362 commits, ~115k net LOC** in one week.
**2026 — 1,237 contributions and counting:**
@@ -16,31 +18,27 @@ In the last 60 days I have written **over 600,000 lines of production code** —
Same person. Different era. The difference is the tooling.
**gstack is how I do it.** It is my open source software factory. It turns Claude Code into a virtual engineering team you actually manage — a CEO who rethinks the product, an eng manager who locks the architecture, a designer who catches AI slop, a paranoid reviewer who finds production bugs, a QA lead who opens a real browser and clicks through your app, and a release engineer who ships the PR. Fifteen specialists and six power tools, all as slash commands, all Markdown, **all free, MIT license, available right now.**
**gstack is how I do it.** It turns Claude Code 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. Twenty specialists and eight power tools, all slash commands, all Markdown, all free, MIT license.
I am learning how to get to the edge of what agentic systems can do as of March 2026, and this is my live experiment. I am sharing it because I want the whole world on this journey with me.
This is my open source software factory. I use it every day. I'm sharing it because these tools should be available to everyone.
Fork it. Improve it. Make it yours. Don't player hate, appreciate.
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. This is how you build like a team of twenty.
- **First-time Claude Code users** — gstack is the best way to start. Structured roles instead of a blank prompt.
- **Tech leads and staff engineers** — bring rigorous review, QA, and release automation to every PR
- **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: your first 10 minutes
## Quick start
1. Install gstack (30 seconds — see below)
2. Run `/office-hours` — describe what you're building. It will reframe the problem before you write a line of code.
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.
Expect first useful run in under 5 minutes on any repo with tests already set up.
**If you only read one more section, read this one.**
## Install — takes 30 seconds
## Install — 30 seconds
**Requirements:** [Claude Code](https://docs.anthropic.com/en/docs/claude-code), [Git](https://git-scm.com/), [Bun](https://bun.sh/) v1.0+, [Node.js](https://nodejs.org/) (Windows only)
@@ -48,11 +46,11 @@ Expect first useful run in under 5 minutes on any repo with tests already set up
Open Claude Code and paste this. Claude does the rest.
> Install gstack: run **`git clone https://github.com/garrytan/gstack.git ~/.claude/skills/gstack && cd ~/.claude/skills/gstack && ./setup`** then add a "gstack" section to CLAUDE.md that says to use the /browse skill from gstack for all web browsing, never use mcp\_\_claude-in-chrome\_\_\* tools, and lists the available skills: /office-hours, /plan-ceo-review, /plan-eng-review, /plan-design-review, /design-consultation, /review, /ship, /browse, /qa, /qa-only, /design-review, /setup-browser-cookies, /retro, /investigate, /document-release, /codex, /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.
> Install gstack: run **`git clone https://github.com/garrytan/gstack.git ~/.claude/skills/gstack && cd ~/.claude/skills/gstack && ./setup`** then add a "gstack" section to CLAUDE.md that says to use the /browse skill from gstack for all web browsing, never use mcp\_\_claude-in-chrome\_\_\* 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.
### Step 2: Add to your repo so teammates get it (optional)
> Add gstack to this project: run **`cp -Rf ~/.claude/skills/gstack .claude/skills/gstack && rm -rf .claude/skills/gstack/.git && cd .claude/skills/gstack && ./setup`** then add a "gstack" section to this project's CLAUDE.md that says to use the /browse skill from gstack for all web browsing, never use mcp\_\_claude-in-chrome\_\_\* tools, lists the available skills: /office-hours, /plan-ceo-review, /plan-eng-review, /plan-design-review, /design-consultation, /review, /ship, /browse, /qa, /qa-only, /design-review, /setup-browser-cookies, /retro, /investigate, /document-release, /codex, /careful, /freeze, /guard, /unfreeze, /gstack-upgrade, and tells Claude that if gstack skills aren't working, run `cd .claude/skills/gstack && ./setup` to build the binary and register skills.
> Add gstack to this project: run **`cp -Rf ~/.claude/skills/gstack .claude/skills/gstack && rm -rf .claude/skills/gstack/.git && cd .claude/skills/gstack && ./setup`** then add a "gstack" section to this project's CLAUDE.md that says to use the /browse skill from gstack for all web browsing, never use mcp\_\_claude-in-chrome\_\_\* 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 Claude that if gstack skills aren't working, run `cd .claude/skills/gstack && ./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 `.claude/`. Nothing touches your PATH or runs in the background.
@@ -60,11 +58,26 @@ Real files get committed to your repo (not a submodule), so `git clone` just wor
gstack works on any agent that supports the [SKILL.md standard](https://github.com/anthropics/claude-code). Skills live in `.agents/skills/` and are discovered automatically.
Install to one repo:
```bash
git clone https://github.com/garrytan/gstack.git ~/.codex/skills/gstack
cd ~/.codex/skills/gstack && ./setup --host codex
git clone https://github.com/garrytan/gstack.git .agents/skills/gstack
cd .agents/skills/gstack && ./setup --host codex
```
When setup runs from `.agents/skills/gstack`, it installs the generated Codex skills next to it in the same repo and does not write to `~/.codex/skills`.
Install once for your user account:
```bash
git clone https://github.com/garrytan/gstack.git ~/gstack
cd ~/gstack && ./setup --host codex
```
`setup --host codex` creates the runtime root at `~/.codex/skills/gstack` and
links the generated Codex skills at the top level. This avoids duplicate skill
discovery from the source repo checkout.
Or let setup auto-detect which agents you have installed:
```bash
@@ -72,7 +85,7 @@ git clone https://github.com/garrytan/gstack.git ~/gstack
cd ~/gstack && ./setup --host auto
```
This installs to `~/.claude/skills/gstack` and/or `~/.codex/skills/gstack` depending on what's available. All 21 skills work across all supported agents. Hook-based safety skills (careful, freeze, guard) use inline safety advisory prose on non-Claude hosts.
For Codex-compatible hosts, setup now supports both repo-local installs from `.agents/skills/gstack` and user-global installs from `~/.codex/skills/gstack`. All 28 skills work across all supported agents. Hook-based safety skills (careful, freeze, guard) use inline safety advisory prose on non-Claude hosts.
## See it work
@@ -115,35 +128,38 @@ 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. Then it challenged your premises, generated three approaches, recommended the narrowest wedge, and wrote a design doc that fed into every downstream skill. Eight commands. That is not a copilot. That is a team.
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.
## The sprint
gstack is a process, not a collection of tools. The skills are ordered the way a sprint runs:
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.
One sprint, one person, one feature — that takes about 30 minutes with gstack. But here's what changes everything: you can run 10-15 of these sprints in parallel. Different features, different branches, different agents — all at the same time. That is how I ship 10,000+ lines of production code per day while doing my actual job.
| Skill | Your specialist | What they do |
|-------|----------------|--------------|
| `/office-hours` | **YC Office Hours** | Start here. Six forcing questions that reframe your product before you write code. Pushes back on your framing, challenges premises, generates implementation alternatives. Design doc feeds into every downstream skill. |
| `/plan-ceo-review` | **CEO / Founder** | Rethink the problem. Find the 10-star product hiding inside the request. Four modes: Expansion, Selective Expansion, Hold Scope, Reduction. |
| `/plan-eng-review` | **Eng Manager** | Lock in architecture, data flow, diagrams, edge cases, and tests. Forces hidden assumptions into the open. |
| `/plan-design-review` | **Senior Designer** | Rates each design dimension 0-10, explains what a 10 looks like, then edits the plan to get there. AI Slop detection. Interactive — one AskUserQuestion per design choice. |
| `/design-consultation` | **Design Partner** | Build a complete design system from scratch. Knows the landscape, proposes creative risks, generates realistic product mockups. Design at the heart of all other phases. |
| `/design-consultation` | **Design Partner** | Build a complete design system from scratch. Researches the landscape, proposes creative risks, generates realistic product mockups. |
| `/review` | **Staff Engineer** | Find the bugs that pass CI but blow up in production. Auto-fixes the obvious ones. Flags completeness gaps. |
| `/investigate` | **Debugger** | Systematic root-cause debugging. Iron Law: no fixes without investigation. Traces data flow, tests hypotheses, stops after 3 failed fixes. |
| `/design-review` | **Designer Who Codes** | Same audit as /plan-design-review, then fixes what it finds. Atomic commits, before/after screenshots. |
| `/qa` | **QA Lead** | Test your app, find bugs, fix them with atomic commits, re-verify. Auto-generates regression tests for every fix. |
| `/qa-only` | **QA Reporter** | Same methodology as /qa but report only. Use when you want a pure bug report without code changes. |
| `/ship` | **Release Engineer** | Sync main, run tests, audit coverage, push, open PR. Bootstraps test frameworks if you don't have one. One command. |
| `/qa-only` | **QA Reporter** | Same methodology as /qa but report only. Pure bug report without code changes. |
| `/cso` | **Chief Security Officer** | OWASP Top 10 + STRIDE threat model. Zero-noise: 17 false positive exclusions, 8/10+ confidence gate, independent finding verification. Each finding includes a concrete exploit scenario. |
| `/ship` | **Release Engineer** | Sync main, run tests, audit coverage, push, open PR. Bootstraps test frameworks if you don't have one. |
| `/land-and-deploy` | **Release Engineer** | Merge the PR, wait for CI and deploy, verify production health. One command from "approved" to "verified in production." |
| `/canary` | **SRE** | Post-deploy monitoring loop. Watches for console errors, performance regressions, and page failures. |
| `/benchmark` | **Performance Engineer** | Baseline page load times, Core Web Vitals, and resource sizes. Compare before/after on every PR. |
| `/document-release` | **Technical Writer** | Update all project docs to match what you just shipped. Catches stale READMEs automatically. |
| `/retro` | **Eng Manager** | Team-aware weekly retro. Per-person breakdowns, shipping streaks, test health trends, growth opportunities. |
| `/retro` | **Eng Manager** | Team-aware weekly retro. Per-person breakdowns, shipping streaks, test health trends, growth opportunities. `/retro global` runs across all your projects and AI tools (Claude Code, Codex, Gemini). |
| `/browse` | **QA Engineer** | Give the agent eyes. Real Chromium browser, real clicks, real screenshots. ~100ms per command. `$B connect` launches your real Chrome as a headed window — watch every action live. |
| `/setup-browser-cookies` | **Session Manager** | Import cookies from your real browser (Chrome, Arc, Brave, Edge) into the headless session. Test authenticated pages. |
| `/autoplan` | **Review Pipeline** | One command, fully reviewed plan. Runs CEO → design → eng review automatically with encoded decision principles. Surfaces only taste decisions for your approval. |
### Power tools
@@ -154,13 +170,14 @@ One sprint, one person, one feature — that takes about 30 minutes with gstack.
| `/freeze` | **Edit Lock** — restrict file edits to one directory. Prevents accidental changes outside scope while debugging. |
| `/guard` | **Full Safety** — `/careful` + `/freeze` in one command. Maximum safety for prod work. |
| `/unfreeze` | **Unlock** — remove the `/freeze` boundary. |
| `/setup-deploy` | **Deploy Configurator** — one-time setup for `/land-and-deploy`. Detects your platform, production URL, and deploy commands. |
| `/gstack-upgrade` | **Self-Updater** — upgrade gstack to latest. Detects global vs vendored install, syncs both, shows what changed. |
**[Deep dives with examples and philosophy for every skill →](docs/skills.md)**
## What's new and why it matters
## Parallel sprints
**`/office-hours` reframes your product before you write code.** You say "daily briefing app." It listens to your actual pain, pushes back on the framing, tells you you're really building a personal chief of staff AI, challenges your premises, and generates three implementation approaches with effort estimates. The design doc it writes feeds directly into `/plan-ceo-review` and `/plan-eng-review` — so every downstream skill starts with real clarity instead of a vague feature request.
gstack works well with one sprint. It gets interesting with ten running at once.
**Design is at the heart.** `/design-consultation` doesn't just pick fonts. It researches what's out there in your space, proposes safe choices AND creative risks, generates realistic mockups of your actual product, and writes `DESIGN.md` — and then `/design-review` and `/plan-eng-review` read what you chose. Design decisions flow through the whole system.
@@ -192,17 +209,9 @@ The sprint structure is what makes parallelism work. Without a process, ten agen
---
## Come ride the wave
Free, MIT licensed, open source. No premium tier, no waitlist.
This is **free, MIT licensed, open source, available now.** No premium tier. No waitlist. No strings.
I open sourced how I do development and I am actively upgrading my own software factory here. You can fork it and make it your own. That's the whole point. I want everyone on this journey.
Same tools, different outcome — because gstack gives you structured roles and review gates, not generic agent chaos. That governance is the difference between shipping fast and shipping reckless.
The models are getting better fast. The people who figure out how to work with them now — really work with them, not just dabble — are going to have a massive advantage. This is that window. Let's go.
Fifteen specialists and six power tools. All slash commands. All Markdown. All free. **[github.com/garrytan/gstack](https://github.com/garrytan/gstack)** — MIT License
I open sourced how I build software. You can fork it and make it your own.
> **We're hiring.** Want to ship 10K+ LOC/day and help harden gstack?
> Come work at YC — [ycombinator.com/software](https://ycombinator.com/software)
@@ -213,6 +222,7 @@ Fifteen specialists and six power tools. All slash commands. All Markdown. All f
| Doc | What it covers |
|-----|---------------|
| [Skill Deep Dives](docs/skills.md) | Philosophy, examples, and workflow for every skill (includes Greptile integration) |
| [Builder Ethos](ETHOS.md) | Builder philosophy: Boil the Lake, Search Before Building, three layers of knowledge |
| [Architecture](ARCHITECTURE.md) | Design decisions and system internals |
| [Browser Reference](BROWSER.md) | Full command reference for `/browse` |
| [Contributing](CONTRIBUTING.md) | Dev setup, testing, contributor mode, and dev mode |
@@ -248,9 +258,10 @@ Data is stored in [Supabase](https://supabase.com) (open source Firebase alterna
## gstack
Use /browse from gstack for all web browsing. Never use mcp__claude-in-chrome__* tools.
Available skills: /office-hours, /plan-ceo-review, /plan-eng-review, /plan-design-review,
/design-consultation, /review, /ship, /browse, /qa, /qa-only, /design-review,
/setup-browser-cookies, /retro, /investigate, /document-release, /codex, /careful,
/freeze, /guard, /unfreeze, /gstack-upgrade.
/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.
```
## License