Project Toothless (github.com)

Project Toothless is an open-source experiment that hands UI creation to an LLM: every click sends rich navigation context to Anthropic’s Claude Sonnet 4.5 (via the Claude Agent SDK), which returns complete HTML for the next page rather than loading predetermined templates or routes. Built with Django 5.2 and HTMX, Toothless uses server-side rendering and hx-vals metadata on every interactive element to tell Claude where the user came from, where they’re going, and what to show next. A simple demo (enter a city for weather) showcases real-time generation of buttons, cards and pages with a consistent Airbnb-style minimalism enforced by a system prompt that you can edit to change color, layout and component rules. The project explores an inverted web-development model—User → AI → UI → Code—highlighting fast prototyping and creative, dynamic experiences but also practical limits: generation typically costs ~$0.01–$0.05 per page, takes 2–10 seconds, can produce incomplete or inconsistent HTML, and lacks persistence, error recovery, or production hardening. Toothless is explicitly experimental and invitation-only for contributors to improve prompts, performance, and reliability; it’s a proof-of-concept that suggests powerful new workflows for UI automation and design-by-AI, while underscoring the need for guardrails, caching, and validation before real-world use.