What Does This Mean?
The specific, especially dangerous combination of an agent having access to private data, exposure to untrusted external content, and the ability to communicate externally — any two alone are usually manageable, but all three together mean a single injected instruction can quietly exfiltrate real data.
REAL-WORLD EXAMPLE
"Before shipping, the team specifically checked whether the agent hit the lethal trifecta — turned out it did, on all three counts."
LORE & ORIGIN
Coined by security researchers in 2025 as a compact mental model for explaining why indirect prompt injection is so dangerous specifically in agents that combine these three capabilities.
EQUIVALENT CONCEPTS IN OTHER LANGUAGES
MENTIONS OVER TIME
Radar observation data not yet available for this term.
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TOP PLATFORMS
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