Monday, November 2, 2026

AI Hidden Character Lab: An Invisible Instruction in a RAG Document

DocsBot indexes uploaded documents and feeds them to its model as context. The upload UI strips visible HTML and markdown — but it keeps zero-width and bidirectional Unicode. A document can read as harmless to a human reviewer while carrying an instruction only the model sees. Lab at a glance: Advanced · 140 XP · about 20 minutes · runs in your browser, no signup or setup. Try it yourself first; the full solution is behind a spoiler below. [se_lab_cta…

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