gstack, the Claude Code skill pack
The open-source skill pack from Y Combinator's CEO (55 skills by the official recount, Aug 2026), installed with one command
黃志弘 Leo
Published 2026-03-31 · Updated 2026-10-08 · 4 readers
What gstack is
gstack = a skill pack for Claude Code
gstack is an open-source project from Garry Tan , the current CEO of Y Combinator. It fits Claude Code with 55 specialist skills, from automated QA to AI code review to opening a PR in one step, installed with one command.
The install puts the skill files in ~/.claude/skills/gstack/, and Claude Code gains slash commands such as /qa, /review and /ship.
As of 2026/10/8 gstack has about 136K GitHub stars and 55 skills.
Install
Claude Code, Git and Bun
- Claude Code installed
- Git installed
- Bun 1.4.2 or later (the tested version; setup refuses anything older than 1.3.3, so run
bun upgradeif you have an old one) - On Windows, also Node.js
Install Bun first
curl -fsSL https://bun.sh/install | bashWhen it finishes, run bun --version and if a version number shows up, you are good.
Install gstack in one line
Open Terminal and paste this:
git clone --single-branch --depth 1 https://github.com/garrytan/gstack.git ~/.claude/skills/gstack && cd ~/.claude/skills/gstack && ./setupType /qa to confirm
Open Claude Code and type:
/qaIf Claude Code recognizes the command instead of saying it cannot find it, gstack installed fine.
The 5 skills you will use most
Give it a URL and it opens a browser, hunts for bugs, and fixes what it finds. No clicking through every button and form yourself. The AI runs the pass and repairs what breaks.
Lets the AI see the page. Screenshots, clicks, filling forms. It used to read code without ever seeing the screen. Now it drives the browser like a person and sees what your users see.
One command runs the tests, reviews the code and opens the PR. It used to mean running tests by hand, writing the PR description, waiting for review. Now one /ship handles all of it.
Reviews your code the way a senior engineer would. It looks at architecture, logic and security, and gives concrete suggestions. Code review is what you miss most when you build alone, and this skill fills the gap.
Hand it an error message and it reads the code, finds the cause and hands you the fix.
Skills by stage of the work (55 in the official pack, 23 covered here)
Planning and thinking
| Skill | What it does |
|---|---|
/office-hours | Simulated office hours to sharpen an idea |
/plan-ceo-review | Reviews your plan from a CEO's seat |
/plan-eng-review | Reviews the technical plan from an engineering lead's seat |
/plan-design-review | Reviews UX and UI from a design lead's seat |
Design
| Skill | What it does |
|---|---|
/design-consultation | Design consultation, talking through direction and style |
/design-review | Reviews a design and suggests improvements |
Development
| Skill | What it does |
|---|---|
/review | AI code review, checking code quality |
/investigate | Tracks a bug to its root cause |
/ship | Tests + code review + PR in one step |
Testing
| Skill | What it does |
|---|---|
/qa | Automated QA, opens a browser to find bugs and fix them |
/qa-only | Tests only, no fixes, produces a report |
/cso | Security review, hunts for vulnerabilities |
/benchmark | Performance testing, finds the bottleneck |
/canary | Canary testing, verifies on a small slice |
Release
| Skill | What it does |
|---|---|
/land-and-deploy | Merges the PR and deploys |
/document-release | Generates release notes |
/retro | Retrospective, records what you learned |
Browser control
| Skill | What it does |
|---|---|
/browse | Opens a browser to visit pages, screenshot and interact |
/open-gstack-browser | Opens gstack's own browser, with a sidebar and cookie import |
/setup-browser-cookies | Sets up browser cookies |
Protect your project
| Skill | What it does |
|---|---|
/careful | Careful mode, confirms every step |
/freeze | Freezes files so the AI cannot change them by mistake |
/guard | Guard mode, watches for changes |
/unfreeze | Unfreezes |
Common questions
Is it free?
Completely free, under the MIT open-source license. Anyone can use it, change it and share it. gstack itself is free, but you still need access to Claude Code (a Claude Pro, Max, Team or Enterprise subscription, or an Anthropic Console API key).
Does it work on Windows?
Yes, Windows 11 is supported. Run the install command in Git Bash or WSL (Windows Subsystem for Linux). Windows also needs Node.js on top of Bun. In Git Bash, rerun ./setup after every git pull.
How is it different from Claude Code?
gstack is anadd-on pack for Claude Code. Claude Code is the base system, and gstack adds 55 specialist skills on top. Without Claude Code you cannot run gstack, and Claude Code works fine on its own if you skip gstack.
How do you update it?
Type this inside Claude Code to move to the latest version:
/gstack-upgradeWill it affect my existing projects?
No. gstack installs into ~/.claude/skills/gstack/ and never touches your project files. It only adds skills inside Claude Code, and changes no existing settings or code.
Safety note: telemetry (usage logging)
gstack keeps a local record of which skills you use, at ~/.gstack/analytics/skill-usage.jsonl.
Nothing is uploaded by default.The official README says telemetry only uploads if you opt in; otherwise the data stays on your own machine.
Turn uploads off, or view your own usage (official commands):
gstack-config set telemetry off
gstack-analyticsHow to check your own state:
cat ~/.gstack/analytics/skill-usage.jsonlContent in there means there is a local record, still going nowhere.
If that bothers you, delete the log:
rm -rf ~/.gstack/analytics/The skills themselves are fine. The telemetry is just something users should know about.