Why it matters

Tool hijacking realizes agent power. Understanding shapes tool security.

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The architecture

Craft input to trigger tool call.

Args set by attacker.

Effect: irreversible actions.

Tool hijacking flowCraft inputtrigger toolAttacker argsin callIrreversible actionsent / executedArgument validation + HITL + rate limits + reversibility checks defend
Tool hijacking.
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How it works end to end

Argument validation: strict types + business rules.

HITL for irreversible.

Rate limits per tool.

Audit + rollback.