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MCP Tool Poisoning: The Attack Hidden in Plain Text

This story is from 2026-10-15. It is preserved in the archive; the latest stories are on the live feed.

In April 2025, Invariant Labs demonstrated something unsettling: you don't need to hack an AI agent to make it misbehave. You just need to describe a tool. They called it tool poisoning — hidden instructions embedded in MCP tool descriptions that manipulate agent behavior. No authentication bypass.…

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  1. 2026-10-15 21:16 · DEV Community — AI
    MCP Tool Poisoning: The Attack Hidden in Plain Text

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