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Originally published at mcpprobe.tech . This is a hands-on walkthrough of one attack: a tool whose description carries instructions for the model. You will see a minimal poisoned tool, why it works, how mcpprobe's META-01 check flags it, what the fixed version looks like, and a lab you can run locally in a minute. For the wider family of payloads (shadowing, hidden Unicode), see our payload write-up . What it is An MCP server tells the client what tools it has with a tools/list response: a name, a description and an input schema for each. The client passes those descriptions to the model so…

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