The Model Context Protocol (MCP) and Agent-to-Agent (A2A) have gained a significant industry attention over the past year. MCP is analogous to a Layer-2 network: it provides detailed visibility and direct access, but it does not scale indefinitely. Just as modern networks are built on both Layer-2 and Layer-3, agentic AI systems will eventually require the full stack as well. In this light, MCP and A2A should not be thought of as competing standards. The teams that recognize this early will be the ones that successfully scale their agentic systems into durable, production-grade architectures.