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The MCP tool-poisoning pattern, traced statically before you ever run the server

This story is from 2026-08-26. It is preserved in the archive; the latest stories are on the live feed.

An MCP server's tool descriptions are English text. They're also, by design, read directly into the model's context — the same trust level as your own system prompt. That gap is the entire attack surface behind two real incidents: Invariant Labs' WhatsApp MCP "rug pull" research, and the postmark-m…

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  1. 2026-08-26 17:27 · DEV Community — AI
    The MCP tool-poisoning pattern, traced statically before you ever run the server

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