Jesus Rodriguez
Built at Built with Opus 4.7: a Claude Code hackathon · Apr 21, 2026 · Remote

AI to Widget is an open-source toolkit designed to turn any existing web application into one with its own conversational agent — grounded in the app's real data, able to take real actions on behalf of the user with their own permissions, deployable with a few Claude Code slash commands. The product was not shipped. Instead, this submission is a structured postmortem of the 5-day build attempt using Opus 4.7 and Claude Code in a spec-driven, constitution-first agentic workflow. The deliverable is a documented report of 20 incidents across 8 failure categories — with timestamps, commit hashes, verbatim evidence, and honest attribution (model error, user error, ambiguous spec, or mixed). It includes 7 actionable recommendations for Anthropic at the model, tooling, and workflow guidance layers. The hackathon asked builders to push Opus 4.7's limits and find them. This report does exactly that — not as a complaint, but as data.