Saturday, October 31, 2026

MCP Tool Poisoning Lab: Hijack an AI Agent Through a Tool Description

DevBot discovers its tools automatically, the way Model Context Protocol (MCP) clients do. Each tool comes with a name and a description, and DevBot reads every description to decide when to use the tool. Those descriptions go straight into its instructions. So a tool does not need to be called to attack the agent. It only needs to be listed. Lab at a glance: Advanced · 145 XP · about 20 minutes · runs in your browser, no signup or…

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