Webhook vs Egress: Two Architectures for AI Agent Security

Two architectures keep showing up in AI agent runtime security in 2026. Both promise to stop bad agent actions before they complete. Underneath they work differently, and the difference matters when an agent goes wrong in production. The first is webhook-based runtime monitoring. The AI platform calls out to a policy service before executing an action, the service decides, and the platform respects the answer. Obsidian Security frames its product this way. From their AI Agent Runtime Security pa