A2A Protocol: How Websites Talk Directly to AI Agents

Imagine calling a business. You say what you need. The person on the other end understands you, checks availability, and gives you a clear answer. No clicking through menus, no guessing, no interpreting HTML. That is exactly the idea behind the A2A Protocol -- except here, it is not a human calling but an AI agent. And the "business" is a website with a structured API. What Is the A2A Protocol? A2A stands for Agent-to-Agent Protocol . Google introduced it in April 2025 and subsequently transferred it to the Linux Foundation, where it is being developed by over 150 organizations. As of February 2026, the specification is at version 0.3.0 (Release Candidate 1). Important upfront: A2A is not a finalized, widely adopted standard. It is a protocol under active development with strong backing, but still early in adoption. We use it because the underlying concept is solid -- not because it already works everywhere. The Core Idea The web has a problem: AI agents can visit websites, read text,