gstack is an open-source software factory built by Garry Tan, President and CEO of Y Combinator, designed to turn Claude Code into a virtual engineering team. The repository contains 23 opinionated tools implemented as slash commands that simulate specialized roles including a CEO, designer, engineering manager, release manager, documentation engineer, and QA lead. Written in TypeScript, gstack enables individual builders to ship products at unprecedented velocity by automating the decision-making and review processes that typically require multiple team members.
The repository emerged from Tan's observation that modern AI agents have fundamentally changed what one person can accomplish. Inspired by Peter Steinberger's solo development of OpenClaw using AI agents, Tan created gstack to systematize his own development workflow. His productivity metrics demonstrate the impact: in 2026, Tan achieved approximately 810 times his 2013 pace when measured by logical code changes rather than raw lines of code, shipping three production services and over 40 features in 60 days while running Y Combinator full-time. Year-to-date through April 18, 2026, his output reached 240 times his entire 2013 output across 40 public and private repositories.
The core functionality organizes work into a structured sprint process: Think, Plan, Build, Review, Test, Ship, and Reflect. Key skills include /office-hours for product interrogation, /plan-ceo-review for strategic validation, /plan-eng-review for architecture decisions, /design-review for catching visual inconsistencies, /review for code quality and production bug detection, /qa for browser-based testing, and /ship for automated release management. Eight power tools support these skills, all accessible through Markdown-based slash commands and completely free under the MIT license.
Installation takes 30 seconds and works across multiple AI coding agents beyond Claude Code, including OpenAI Codex, Cursor, Factory Droid, Slate, Kiro, Hermes, and GBrain. The repository supports both individual installation and team mode, where gstack auto-updates across shared repositories without vendored files or version drift. Integration with OpenClaw agents allows natural language dispatch of gstack skills, enabling developers to request security audits, code reviews, QA testing, or feature planning through conversational prompts that automatically spawn appropriately configured Claude Code sessions.
GitGenius tracking shows the repository has grown from 119,433 to 119,434 stargazers and from 17,804 to 17,805 forks since July 4, 2026. The project maintains active engagement with a median issue and pull request response latency of 15.5 hours and a mean of 109.5 hours across 466 tracked items. Primary contributor garrytan has logged 392 events, with secondary contributors jbetala7 and mvanhorn contributing 49 and 27 events respectively. The repository connects to related projects including agentops-ai/agentops, openclaw/openclaw, and anthropics/claude-code through overlapping contributor networks.
The target audience includes technical founders and CEOs who still want to ship code, first-time Claude Code users seeking structured guidance, and tech leads and staff engineers who need rigorous review and release automation. Tan emphasizes that gstack is not about who types the code but what ships, and the tooling represents a fundamental shift in how individual builders can operate at team scale. The repository includes comprehensive documentation addressing the lines-of-code controversy, methodology for measuring productivity gains, and detailed setup instructions for various deployment scenarios.
