GStack — Garry Tan's Open Source Claude Code Workflow System
Y Combinator CEO Garry Tan's open-source toolkit that turns Claude Code into a virtual engineering team — with 15+ slash commands for product planning, code review, QA, security audits, and shipping.
GStack is an open-source project by Garry Tan (President & CEO of Y Combinator) that transforms Claude Code from a single generic assistant into a full virtual engineering team.
What it does: GStack provides 15+ opinionated slash commands, each acting as a different specialist on your team. These include a CEO who rethinks product scope, an Eng Manager who locks architecture, a Staff Engineer who reviews code for production bugs, a QA Lead who opens a real browser to test your app, a Chief Security Officer who runs OWASP + STRIDE audits, and a Release Engineer who ships your PR.
Key skills include: • /office-hours — YC-style product discovery with six forcing questions • /plan-ceo-review — Rethinks the problem, finds the 10-star product • /plan-eng-review — Locks architecture, data flow, edge cases, and tests • /review — Finds bugs that pass CI but break in production, auto-fixes obvious ones • /qa — Opens a real browser, clicks through flows, finds and fixes bugs • /ship — Runs tests, audits coverage, pushes code, opens PR • /cso — Full OWASP Top 10 + STRIDE security audit
Why it matters for beginners: Instead of staring at a blank Claude Code prompt, GStack gives you a structured process: Think → Plan → Build → Review → Test → Ship. Each skill feeds into the next, so nothing falls through the cracks.
Results Garry reports: 600,000+ lines of production code in 60 days, 10,000–20,000 lines per day, part-time while running YC full-time.
MIT licensed, free forever. Works with Claude Code, Codex, Gemini CLI, and any agent supporting the SKILL.md standard.
## Installation
1. Open Claude Code and paste this command: Install gstack: run git clone https://github.com/garrytan/gstack.git ~/.claude/skills/gstack && cd ~/.claude/skills/gstack && ./setup 2. Add a "gstack" section to your CLAUDE.md listing available skills 3. To add to a project for teammates: cp -Rf ~/.claude/skills/gstack .claude/skills/gstack && rm -rf .claude/skills/gstack/.git && cd .claude/skills/gstack && ./setup Requirements: Claude Code, Git, Bun v1.0+
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