**gstack** is a GitHub repository providing six specialized slash commands for Claude Code, transforming it into role-specific tools: /plan-ceo-review for product rethinking, /plan-eng-review for architecture planning, /review for bug detection, /ship for deployment, /browse for QA testing, and /retro for performance analysis.
It addresses limitations of generic Claude Code agents by enforcing consistent workflows for planning, reviewing, shipping, and testing apps. Installation involves cloning the repo into Claude's skills directory, running setup, and configuring CLAUDE.md; requires Claude Code, Git, and Bun.