Prompt Injection Defense Weekly

Spotlighting: the one-line defense that drops indirect injection from 50% to under 2%

Indirect prompt injection is now confirmed in production exploits. This week's defense: Spotlighting — a prompting technique that restructures untrusted content as data rather than instructions, dropping attack success from over 50% to under 2%. Includes two copy-paste ready system prompt templates for RAG pipelines, agents, and summarizers.