Developer builds AI agent that answers Next.js questions only from verified, current docs

A developer has built 'Still True,' an AI agent designed to answer Next.js questions exclusively from a structured, up-to-date knowledge base rather than relying on a model's potentially outdated training data. The project was submitted for the Sanity Challenge and addresses a common problem where AI models confidently give stale answers, such as incorrectly stating that the App Router caches fetch requests by default — a behaviour that changed after Next.js 14. The agent uses Sanity Context's knowledge base and conflict-detection features to surface disagreements between sources, showing both the outdated and current guidance side by side. When a topic is not covered in the knowledge base, the agent explicitly states so instead of guessing or hallucinating an answer. The tool is live at still-true.vercel.app and its source code is publicly available on GitHub.