The first time you type /office-hours into Claude Code with GStack installed, something strange happens. The AI stops acting like a helpful coding assistant and starts acting like a skeptical product manager who thinks your feature idea is probably wrong.

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That is the design. And it is why GStack — Garry Tan's open-source Claude Code skill setup — has accumulated 82,700 stars and 12,000 forks on GitHub since its March 2026 launch.

For context: Garry Tan is the President and CEO of Y Combinator. When the person who has reviewed more startups than almost anyone else on earth open-sources the exact AI development workflow that runs his code, developers pay attention.…