A2A Directory

A2A Directory collects resources for Agent2Agent (A2A), an open protocol from Google that lets AI agents communicate and collaborate over HTTP, JSON-RPC, and Server-Sent Events, aiming to break down silos between separately built agent systems. It links to the official A2A documentation, JSON and Agent Card specifications, and to community-written guides comparing A2A with MCP, implementing A2A in TypeScript and Python, and integrating it with other agent frameworks.

It lists official Python sample agents built on different frameworks, such as a Google ADK expense-report-filing agent and an AG2-plus-MCP agent, alongside community implementations, community samples, A2A-compatible services, and services that combine A2A with the x402 payment protocol. It also points to the official A2A GitHub organization and demo video for readers getting started, and to a community-maintained list of A2A implementations.