Day 01/90: Teaching a RAG App When to Say “I Don’t Know”

This story is from 2026-10-16. It is preserved in the archive; the latest stories are on the live feed.

Getting an AI app to answer a question is exciting. Getting it to recognize when the documents don’t contain the answer is a more interesting challenge. For Day 1 of my AI challenge, I’m starting with a small problem: How can we make a RAG application avoid answering questions its sources cannot su…

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1. 2026-10-16 22:55 · DEV Community — AI
   Day 01/90: Teaching a RAG App When to Say “I Don’t Know”