Damn Vulnerable LLM Agent is an educational chatbot built with Langchain that implements a Large Language Model ReAct agent designed to teach security researchers and developers about prompt injection attacks. The project focuses specifically on Thought/Action/Observation injection techniques and was adapted from a challenge created by WithSecure Labs for the BSides London 2023 CTF competition. It supports multiple LLM backends including OpenAI, HuggingFace models, and locally-run models via Ollama, and can be deployed using either Pipenv or Docker with a Streamlit interface.