gstack

Fast headless browser for QA testing, deployment verification, and user flow dogfooding.

- Navigate URLs, interact with elements, verify page state, and take annotated screenshots with element labels and reference IDs

- Supports responsive layout testing (mobile/tablet/desktop), file uploads, form validation, and dialog handling with auto-accept

- Includes snapshot diffing to show exactly what changed after interactions, plus console and network inspection for debugging

- Persistent browser state across commands (cookies, sessions, tabs) with ~100–200ms per command after initial startup

When to invoke this skill

Navigate pages, interact with
elements, verify state, diff before/after, take annotated screenshots, test responsive
layouts, forms, uploads, dialogs, and capture bug evidence. Use when asked to open or
test a site, verify a deployment, dogfood a user flow, or file a bug with screenshots.

Preamble (run first)