gstack

Drive a headless browser to navigate pages and verify expected results.

2|Updated Mar 31, 2026

Search Tags:#automation #screenshots #qa #playwright #browser #headless #diffs

Ready to run

npx skills add https://github.com/jayzalowitz/skytwin --skill gstack-jayzalowitz

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: gstack
Source: https://github.com/jayzalowitz/skytwin/tree/main/.claude/skills/gstack
Command: npx skills add https://github.com/jayzalowitz/skytwin --skill gstack-jayzalowitz

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill requires playwright, diff, puppeteer-core, @anthropic-ai/sdk.

What problem does it solve?

Navigating and evaluating web flows in a repeatable, automated way to catch regressions and collect evidence.

Core Features & Use Cases

Automated browsing for QA, regression testing, and dogfooding.
Capture diffs, screenshots, and state validations across pages.
Use cases include bug repro, deployment checks, and UI verification.

Quick Start

Launch a headless session, navigate to a URL, and capture evidence with diffs and annotated screenshots.

Frequently Asked Questions about gstack

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I automate headless browser testing for UI regression checks?▼

Automate headless browser testing by driving a long-running Chromium daemon to navigate web pages, interact with elements, and capture annotated screenshots with diffs to verify expected UI results.

Can I use Playwright to capture visual diffs and screenshots for QA?▼

Playwright supports visual diffing and screenshot capture for QA by using snapshot-based references, applying visual diffs, and generating annotated overlays to highlight UI changes and regressions.

What is the best way to automate bug reproduction in complex web apps?▼

Automate bug reproduction by driving a headless browser to navigate complex web app flows, interact with pages, and capture state validations alongside screenshot evidence for repeatable workflows.

Does headless browser QA support cookie and session isolation for repeatable tests?▼

Headless browser QA supports robust cookie and session isolation, ensuring that automated testing, deployment checks, and UI verification workflows remain repeatable across independent test runs.

How do I perform responsive testing across different viewport sizes with headless browsing?▼

Perform responsive testing by driving a headless browser to navigate target URLs and capture state validations, screenshots, and diffs across various viewport configurations for UI verification.