A2A and MCP in 2026: Different Layers, One Agent Stack

A2A and MCP in 2026: Different Layers, One Agent Stack Most discussions about agent interoperability still ask the wrong question: Will A2A replace MCP? No. If you are building serious agent systems in 2026, the more useful framing is: A2A handles agent-to-agent coordination MCP handles agent-to-tool and agent-to-context integration They solve different problems. In practice, the strongest architectures will use both. The confusion There is a reason people keep comparing them. Both A2A and MCP are open protocols. Both are about interoperability. Both became much more visible as the industry moved from single-chat assistants to systems that actually do work: planning, calling tools, delegating tasks, negotiating responsibilities, and returning artifacts. But interoperability is not one thing. There are at least two distinct layers: How an agent gets access to tools, data, and execution context How one agent discovers, talks to, and coordinates with another agent MCP targets the first la