Setup & Installation
npx skills add https://github.com/garrytan/gstack --skill browse
https://github.com/garrytan/gstack/tree/main/browse
View on GitHubWhat This Skill Does
A headless Chromium controller for testing and verifying web apps. Supports navigation, form interaction, element state checks, responsive screenshots, file uploads, and diff comparisons. Runs at roughly 100ms per command after initial startup.
Instead of manually clicking through a site to verify changes, you get scriptable, diffable browser automation that runs inside the same Claude session where you made the change.
When to use it
- Taking annotated screenshots of a broken UI state to attach to a bug report
- Verifying a login flow works end-to-end after a backend change
- Checking mobile, tablet, and desktop layouts in one command
- Comparing staging and production pages to catch unintended differences
- Testing file upload and dialog behavior without touching a real browser