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. 📖 Read the full version on AgentConn → 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. They also argue about it extensively on Hacker News . This guide explains what GStack actually does, how it compares to oh-my-openagent and other harnesses, why the "it's just prompts" criticism misses the point, and whether it belongs in your workflow.…