What Is the A2A Protocol and Why It Matters
Google's Agent-to-Agent (A2A) protocol is an open standard that lets AI agents from different vendors discover each other, communicate, and collaborate. Here's why it changes everything.
The Problem: Isolated AI Agents
Today, most AI agents live in silos. An agent built with OpenAI can't talk to one built with Anthropic. Your sales agent can't coordinate with your support agent if they run on different platforms. This fragmentation limits what AI can actually do for businesses.
Enter the A2A Protocol
The Agent-to-Agent (A2A) protocol, introduced by Google, is an open standard designed to solve this exact problem. It defines a common language for AI agents to:
- Discover each other through AgentCards — structured metadata describing capabilities, skills, and endpoints
- Communicate using standardized message formats with support for tasks, artifacts, and streaming
- Collaborate on multi-step workflows with built-in task state management
How A2A Works
At its core, A2A defines three concepts:
1. AgentCards
Every A2A-compliant agent publishes an AgentCard — a JSON document that describes what the agent can do, what inputs it accepts, and how to reach it. Think of it as a business card for AI agents.
2. Tasks
When agents collaborate, they create Tasks. A task has a lifecycle: submitted → working → completed (or failed). Tasks can contain messages, artifacts (files, data), and can be delegated to sub-agents.
3. Messages
Agents exchange structured messages within tasks. Messages can contain text, data, or references to artifacts. The protocol supports both synchronous and streaming communication.
Why This Matters for Developers
Before A2A, building multi-agent systems meant committing to a single vendor's ecosystem. With A2A, you can:
- Build agents with any framework or model provider
- Let your agents discover and work with agents from other teams and organizations
- Create marketplaces where agents offer services to each other
- Scale horizontally by delegating work across specialized agents
Getting Started with A2ABase
A2ABase on Oya.ai provides the infrastructure layer for A2A. You get agent discovery, message routing, task management, and sandboxed execution — all production-ready. No need to implement the protocol from scratch.
Sign up at oya.ai to start building A2A-compliant agents today.