How to Detect Prompt Injection in Your LLM Agent — Python, 5 Minutes

Your LLM agent processes user messages, retrieves documents, calls tools, and acts on the results. But what happens when one of those inputs contains instructions designed to hijack your agent's behavior? This is prompt injection — and if you're running an LLM agent in production, you need a plan for it. In this tutorial, I'll show you how to add prompt injection detection to a Python LLM agent using AgentShield , an open-source classifier that scans inputs before they reach your model. Five min