ANTAP

ANTAP: Geometry-based routing defense against malicious agents in multi-agent systems

Researchers introduce ANTAP (Automatic Non-Textual Agent Picker), a routing architecture for multi-agent LLM systems that replaces text-based agent self-descriptions with empirical capability testing and algebraic projection in a shared semantic space. The approach creates a 'linguistic firewall' that makes metadata-based injection attacks inexpressible at inference time. Against description-based injection attacks, ANTAP achieves near-zero attack success rate compared to 67.3%+ for baseline routers, and reduces embedding-based attack success by 20%.