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Archestra's OpenAPPA addresses critical vulnerabilities in autonomous agents by enforcing deterministic security rules outside the agent's execution loop, effectively neutralizing prompt injection and data exfiltration risks that probabilistic classifiers often miss. This open-source engine achieves a 0% attack success rate on major benchmarks, offering a robust alternative to current industry standards where even the best probabilistic models fail in less than 1% of cases. For developers building enterprise AI workflows, this represents a significant shift from fragile, prompt-injectable safety layers to auditable, rule-based enforcement that maintains agent functionality without sacrificing security.
New Archestra's OpenAPPA Saturates Two Major Security Benchmarks with a 0% Attack Success Rate

Archestra released OpenAPPA, an open-source security engine designed to stop data exfiltration caused by prompt injection or model hallucination. The team reports zero successful attacks when running security benchmarks Bench-Corp (20 multi-step enterprise workflows) and AgentThreatBench, versus 10% for Claude Code’s auto mode and 31% for Microsoft FIDES. By Bruno Couriol
Archestra released OpenAPPA, an open-source security engine designed to stop data exfiltration caused by prompt injection or model hallucination. OpenAPPA runs outside the agent’s prompt and execution loop. Its configuration details concepts such as data sources, audiences, trust levels, and authorities, along with their associated deterministic security enforcement rules. The team reports zero successful attacks when running security benchmarks Bench-Corp (20 multi-step enterprise workflows) and AgentThreatBench, vs. 10% for Claude Code’s auto mode and 31% for Microsoft FIDES. The industry’s answer to approval fatigue is a second model that judges each tool…
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