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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.

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.

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