{"slug": "a2a-agent2agent-protocol-a-developers-guide-to-payloads-tasks-and-event-queues", "title": "A2A (Agent2Agent) Protocol: A Developer’s Guide to Payloads, Tasks, and Event Queues", "summary": "Google's A2A (Agent2Agent) protocol enables AI agents built with different frameworks and vendors to communicate directly, solving the problem of agent-to-agent interoperability. The protocol defines standard payloads, task lifecycles, and event queues for exchanging text and file attachments between agents.", "body_md": "Member-only story\n\n# A2A (Agent2Agent) Protocol: A Developer’s Guide to Payloads, Tasks, and Event Queues\n\nIf you have spent any time building AI agents in the last year, you have probably run into two acronyms that get thrown around a lot: MCP and A2A. MCP gets most of the spotlight because it solves an easy-to-explain problem — letting an agent talk to tools. A2A solves a quieter but equally important problem: letting agents talk to *each other*.\n\nThis article is a practical, code-first walkthrough of A2A. We will cover what it is, why it exists, exactly what its payloads look like (down to the JSON), how a real agent-to-agent exchange works with text and file attachments, and how the task lifecycle actually functions under the hood. By the end, you should be able to read A2A code without squinting, and write your own agent executor with confidence.\n\n## What Problem Is A2A Actually Solving?\n\nPicture a small company that has built three separate AI agents over the past year, each with a different team, a different framework, and sometimes a different vendor:\n\n- A research agent built with one framework\n- A booking/transaction agent built with another\n- A compliance-checking agent built on a completely different stack", "url": "https://wpnews.pro/news/a2a-agent2agent-protocol-a-developers-guide-to-payloads-tasks-and-event-queues", "canonical_source": "https://blog.stackademic.com/a2a-agent2agent-protocol-a-developers-guide-to-payloads-tasks-and-event-queues-80eb6a76bd01?source=rss----d1baaa8417a4---4", "published_at": "2026-07-15 08:20:31+00:00", "updated_at": "2026-07-15 08:22:28.729176+00:00", "lang": "en", "topics": ["ai-agents", "developer-tools", "artificial-intelligence"], "entities": ["Google", "A2A", "MCP"], "alternates": {"html": "https://wpnews.pro/news/a2a-agent2agent-protocol-a-developers-guide-to-payloads-tasks-and-event-queues", "markdown": "https://wpnews.pro/news/a2a-agent2agent-protocol-a-developers-guide-to-payloads-tasks-and-event-queues.md", "text": "https://wpnews.pro/news/a2a-agent2agent-protocol-a-developers-guide-to-payloads-tasks-and-event-queues.txt", "jsonld": "https://wpnews.pro/news/a2a-agent2agent-protocol-a-developers-guide-to-payloads-tasks-and-event-queues.jsonld"}}