GStack and Claude Code: planning, design and QA tutorial

Garry Tan demonstrates GStack, an open source toolkit of skills for Claude Code, through a proposed app that collects 1099-INT tax documents. He starts in Conductor with Office Hours, which questions demand, existing alternatives and the business model before producing a plan. The discussion expands the idea into browser automation for collecting documents and working with a tax preparer.

The proposed workflow has users log in themselves before an AI agent navigates their bank portals. Tan describes this browser interaction as happening on the user's computer. That statement does not establish that the language models run locally or that the whole workflow works offline.

An adversarial review flags gaps in failure handling, privacy and two-factor authentication. Tan reports that it fixes 16 issues across two rounds, with three issues remaining. He then uses Design Shotgun to generate three dashboard directions through Codex and Image Gen, choosing a card layout with progress indicators.

The later walkthrough covers code review, browser QA and preparing pull requests to merge. Tan explains that GStack wraps Playwright and Chromium in a CLI for screenshots and browser interactions. He also describes running parallel Claude Code sessions across branches and projects. His throughput figures reflect his own reported workflow, rather than a benchmark for every coding assistant user.