Indirect Prompt Injection Through Tool Descriptions and Tool Output: How Untrusted Metadata Hijacks Agents
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TL;DR A function-calling or MCP agent reads more than the user's message. It also reads the descriptions of the tools it can call, and the content those tools return . Both are text, both flow into the same context window, and a model does not natively distinguish "instruction from my operator" fro…
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- 2026-10-06 19:11 · DEV Community — AI
Indirect Prompt Injection Through Tool Descriptions and Tool Output: How Untrusted Metadata Hijacks Agents