gstack Office Hours
YC-style office hours: six forcing questions that test if an idea is worth building.
Community, verifiedby Garry TanChecked October 18, 2026
A gstack skill modeled on Y Combinator office hours, from YC's Garry Tan. In startup mode it presses on demand, the status quo and the narrowest wedge; in builder mode it brainstorms side projects, then saves a design doc.
Who it is for
- Founders
- Indie hackers
- Product managers
- Students with startup ideas
Prompts to try
Once the skill is installed, ask for the result in plain words. Claude picks the skill up on its own.
Office hours: is an AI meal planner for diabetics worth building?I have an idea for a marketplace for used camera gear, grill itHelp me think through this side project before I write codeHow to install it
In Claude Code
git clone --single-branch --depth 1 https://github.com/garrytan/gstack.git ~/.claude/skills/gstackcd ~/.claude/skills/gstack && ./setup
In Claude.ai
Not practical in Claude.ai because the skill drives local command-line tools, so use Claude Code.
Good to know
Installs the full gstack suite, including plan reviews, QA, design review and shipping skills.
Unlock the install steps
Free. Leave your email once to open the install steps for all 149 skills, and get the best new skills each month.
How we checked it
Confirmed SKILL.md at office-hours/SKILL.md in garrytan/gstack via the GitHub API; skill folder last changed 2026-10-11, repo has 136,777 stars and was pushed 2026-10-17.