Encyclopedia · 176 concepts

Safety, Ethics & Governance · intermediate · concept 171 of 176

Prompt Injection

An attack where instructions hidden inside content the model reads are followed as if the user had issued them. Direct injection comes from whoever is typing; indirect injection arrives through a fetched web page, document, or tool result, which makes it the central security problem for tool-using agents. No complete fix exists, so defences layer restricted permissions, separation of instructions from data, and human confirmation before consequential actions.

Key terms

Indirect injectionTool poisoningInstruction hierarchyLeast privilegeHuman in the loop

Where you meet it in the real world

Agent security review, browser agents, email and document assistants, threat modelling