GStack

AI assistantCodingTools

GStack is an open-source skill pack for Claude Code created by Y Combinator CEO Garry Tan. It transforms a single AI assistant into a team of specialists, providing nine opinionated workflow skills covering plan review, code review, shipping, browser automation, QA testing, and engineering retrospectives. These skills enable structured, role-driven workflows that cover the full software development lifecycle, from product planning to automated QA testing and one-command shipping.

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May 2026

AI assistant, Coding

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gstacks.org

Pros and cons

Pros

Open-source codebase allows for deep customization and transparency
Comprehensive coverage of the software development lifecycle
Reduces decision fatigue through pre-defined, opinionated workflows
Enables complex browser automation and automated QA testing

Cons

Strict dependency on the Claude Code environment for functionality
Opinionated workflow structures may not align with all team standards
Requires technical proficiency for initial setup and configuration
Output quality is inherently tied to the underlying Claude model performance

FAQ

What exactly is GStack and how does it work with Claude?

GStack is an open-source extension for Claude Code that adds nine specialized skills to the AI assistant. These skills cover the entire software development lifecycle, including code reviews, browser automation, and QA testing. It is designed to help developers implement structured, role-driven workflows, effectively turning a single AI into a specialized engineering team for more complex project management.