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How to Wire Agents at Scale: Developer’s Guide to Google’s A2A Protocol
Every engineer, team, company asks the same question nowadays, ‘How do we wire agents together at scale?’.
This guide is the missing manual for A2A implementation with lots of useful and practical tips that we prepared for you.
Let’s get into it!
Brief Overview of Agent2Agent Protocol
Agent-to-Agent (A2A) is an open, JSON-RPC-based protocol that provides autonomous agents a common, web-native language for discovery, delegation, and streaming collaboration.
Google announced it with more than 50 launch partners and positioned it as the “TCP/IP layer” of the emerging agentic stack, which complementary to Anthropic’s MCP on the “tools” side and OpenAI function-calling on the model side
A2A together with MCP, answers the two perennial questions every solution architect asks:
- How does an agent see and act on the outside world, which is MCP.
- How do multiple agents find one another and collaborate safely, which is A2A.
Although we will mention the role of MCP in this article, we will mainly focus on A2A.
