Prompt Injection in MCP Servers

This article examines prompt injection in MCP (Model Context Protocol) servers, a documented attack class where AI agents are exploited through trusted tool metadata. It explains how the protocol's design, which treats tool descriptions as instructions for LLMs, collapses the line between code and data, creating a live attack surface. The article details attack vectors, realistic attack flows, and a defense-in-depth architecture beyond simple model behavior requests. It covers the OWASP Top 10 vulnerability for LLM applications and how MCP changes the attack surface compared to conventional web applications.