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About this paper
Bijeeta Pal, Sridhar Reddy Maddireddy, Muhaimin Bin Munir, Zoltan Puha, Max Zhurovich, Adi Raghavendra, Sean Tout
Persona Guardrail defines an agent’s permitted scope with semantic allowlists and blocklists, then checks user requests and final responses synchronously. On the non-mixed PAGE benchmark, an iterated allowlist raises out-of-domain detection from 57.3% to 93.5% and accuracy from 85.7% to 95.9%, compared with a generic judge. These results do not establish protection against indirect prompt injection or intermediate tool actions.
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