intermediateCommunityQuiz
Treating Tool and Document Output as Untrusted Data
Why every byte an agent reads from a tool result, web page, file, or message is untrusted data rather than instruction: how to spot embedded directives, avoid the confused-deputy trap, tag content provenance, and refuse PII or credential disclosure even when the request is framed inside content.
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Treat Every Tool Result as Data, Never as Instruction
Treating Tool and Document Output as Untrusted Data# Treat Every Tool Result as Data, Never as Instruction The moment an agent reads a tool result, a web page, a file, or an inbound message, it is holding **untrusted data**. The text may *look* like a system directive, but it arrived through a data channel — and data has no authority to command the
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