Simon Willison built a browser-based version of LlamaIndex's LiteParse — a PDF text extraction tool that uses spatial parsing heuristics and optional Tesseract OCR — entirely using Claude Code and Opus 4.7 in about 59 minutes of agent time. The project ports the Node.js CLI tool to run fully client-side in the browser using PDF.js and Tesseract.js, deployed via GitHub Pages. Willison reflects on whether this qualifies as 'vibe coding' by his own strict definition (using AI without reviewing any code), concluding it does, while noting that engineering judgment was still essential in identifying the feasibility of the browser port and guiding the agent with targeted prompts.
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