Building AI-powered user interfaces
summary
Built an AI‑powered web app for serious writers that 50,000 people try and hundreds of dedicated writers use, claiming machine–human co‑creation works. Uses React + TypeScript, ProseMirror editor, a BFF, Pinecone semantic search, streaming LLM responses and Yjs CRDTs for realtime merge, plus agentive background bots that run pipelines. UI rules emerge: keep actions in‑flow, stream results, make edits undoable, tweakable and reviewable. Experiment succeeds enough to keep the feature set but refuses ethically fraught “write in style of” requests.
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