Trust Without Continuity: Why Initial Authentication Fails for AI Agents

Vercel's breach exposes a critical flaw in how organizations secure AI tools: authentication validates an agent's identity once at setup, but provides no mechanism to detect behavioral drift after compromise. As frontier-class models become cheaper—DeepSeek V4 at $1.74 per million tokens—enterprises will deploy dozens of AI tools with system access, dramatically multiplying attack surface. The industry's existing security tools answer 'is this who it claims?' but cannot answer 'is this still behaving like itself?'—a gap that will define enterprise AI security risk.