Phoenix.new is a fully online, browser-based AI coding agent environment tailored for Elixir and Phoenix, offering a VSCode-like interface and isolated Fly Machines for safe root shell access.
The system provides a headless browser for the agent to interact with apps in real time, enabling live previews, UI interaction, and JavaScript state inspection alongside server logs.
Agents can install OS packages, modify mix.exs, run and test code, deploy cloud-hosted apps with shareable URLs, and integrate with GitHub via the gh CLI.
Phoenix.new supports full-stack features including WebSockets, Presence, databases (PostgreSQL, MySQL), and can reverse-engineer schemas to build Ecto models.
Though optimized for Phoenix, the environment includes multiple languages and frameworks, allowing agents to build Rails, React Native, Svelte, or Go apps.
The vision is an async agent-driven developer workflow where continuous integration and remote environments handle routine tasks, shifting much of iteration away from local machines.
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