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What are the data-exfiltration channels in an AI agent, and how do you close them?

A hijacked agent does not need a 'send email' tool to leak secrets. A rendered markdown image, a URL parameter, or a DNS lookup is enough. The signal is enumerating the covert channels and locking down egress, not just tools.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

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LEARN THE BACKGROUND

These lessons teach the material this question tests, in order and from the beginning.

Agent Engineering·Trusting nothing the agent readsSign in14mThe dangerous text is the text your own code fetchedInjection through a chat box is the easy case, because you know that text is untrusted. The hard case arrives inside a tool result your own code requested, wearing your system's clothes. This lesson maps where untrusted text actually enters an agent and what to do at each door.Agent Engineering·Trusting nothing the agent readsSign in14mDeciding what the agent may do, not what it may sayOnce you accept that an injection will eventually succeed, the only thing that bounds the damage is what the agent was permitted to do at that moment. Identity, scoping, and the actions that need a second signature.

UP NEXT ON YOUR JOURNEY

Next in this trackWhy is 'the model is not a trust boundary' the core principle of secure RAG, and how do you build on it?Next in this trackHow do you set and spend an epsilon budget when deploying differential privacy in practice?Next in this trackWhen is federated learning actually worth it versus centralizing the data?

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