At Google Cloud Next 2026, Google unveiled Agent2Agent, or A2A, an open protocol for AI agents to communicate across products, clouds and model stacks. That makes it more than another developer convenience: it is an attempt to define how autonomous software discovers peers, negotiates jobs, exchanges state and returns structured results in production.
From Tool Use to Service Architecture
Google framed A2A as complementary to Anthropic’s Model Context Protocol, not a rival. MCP standardises how an agent accesses tools and context, while A2A targets the traffic between agents themselves. The distinction matters because the market is moving past single-agent demos toward distributed systems, where the hard problems look less like prompting and more like service design.
That shift changes how developers should think about agents. A single assistant calling a few APIs is still basically an application feature. A network of agents that can discover specialised peers, assign tasks, pass intermediate results and recover from failure starts to resemble service-oriented software. In that world, protocols matter because they reduce custom integration work and make multi-vendor systems easier to operate. Google is effectively arguing that agents need shared rules for communication in the same way web services needed standard patterns for requests, authentication and error handling.
Why the Protocol Layer Matters
If agents begin handing work to other agents across vendor boundaries, developers will need infrastructure for identity, trust, retries, observability and policy enforcement. That creates a new competitive layer above foundation models and application features: routing, governance and workflow control for agent-to-agent traffic. With Google and its cloud ecosystem pushing the format, the next 12 to 24 months may decide whether multi-agent interoperability becomes a real platform market.
The strategic implication is larger than the protocol spec itself. If A2A gains adoption, cloud providers, integration vendors and enterprise software platforms could compete to become the default coordination layer for autonomous workflows. That would make reliability, auditability and access control just as important as raw model quality. It also suggests that the next battle in AI may not be only about who builds the smartest model, but who makes large fleets of agents practical to deploy, monitor and govern at scale.
In that scenario, the winners may be the companies that own the rails between agents rather than the models at either end.