Understanding the Shifting Protocols That Secure AI Agents

New AI protocols are being adopted faster than most security teams can meaningfully assess their authentication and authorization models. MCP, A2A, and AP2 are reshaping how agents interact, but the identity layer underpinning them remains uneven and, in some cases, immature.

Each of these protocols promises to standardize a slice of the agentic AI ecosystem. Some of them (MCP, specifically) have seen unprecedented adoption because they really do work. Today, underneath the branding wars and tech partnerships, a genuine architecture is forming where enterprise AI use cases are finally valid and monetizable.