hahhforest
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pi-textbook
A hands-on course that walks through building a Pi-style coding agent from scratch across 15 checkpoints, starting from an offline agent trajectory.
Why it is worth attention
It demonstrates a novel paradigm where the entire phone interface is generated by an LLM in real time, using a compact streaming DSL (openui‑lang) and rendering true native UI components, all with no backend to deploy.
Who it is for
- Developers exploring generative UI and LLM‑driven interfaces
- Mobile app designers interested in dynamic, code‑less UIs
- AI researchers looking for a practical demo of streaming language models in UX
- Hackers and tinkerers who want to fork a base for real‑world integrations
Use cases
- Prototyping new app ideas by simply describing the desired interface
- Building a universal ‘ask‑anything’ assistant that generates weather, restaurant lists, or booking forms on demand
- Showcasing how a single component contract can produce platform‑native UIs (iOS Cupertino / Android Material 3)
- Experimenting with LLM‑driven navigation and speculative prefetching for instant screen transitions
Strengths
- Streaming real‑time generation – the UI paints live as tokens arrive, before the response finishes
- Native look and feel on both iOS and Android from a single contract, without platform‑specific prompt changes
- Open‑source MIT license, built on the OpenUI standard, with clear package separation and a test suite
- Bring‑your‑own‑key model avoids backend cost and keeps user data on‑device (Keychain/Keystore)
Considerations
- All actions are simulated – ordering, booking, payments do nothing and reflect no real state
- Requires a free Cerebras API key to run; content may be fictional unless optional web/image tools (Exa, Unsplash) are configured
- Strictly an experiment – no real integrations are wired in, so it is not a replacement for existing apps
README quick start
Quick start
Description
What if your phone had no apps
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