---
type: "Specification"
title: "Agent2Agent (A2A)"
description: "Agent-to-agent protocol: capability discovery, delegation, long-running tasks, streaming."
resource: "https://developers.googleblog.com/en/a2a-a-new-era-of-agent-interoperability/"
tags: [a2a, protocol, agentic]
generated: { by: human:crpage, at: 2026-07-09T09:44:00Z }
status: stable
sources: [{ id: primary, resource: "https://developers.googleblog.com/en/a2a-a-new-era-of-agent-interoperability/" }]
---

Launched by [Google](../organisations/google.md) in April 2025 and donated to the [Linux Foundation](../organisations/linux-foundation.md) mid-2025. Uses JSON [Agent Cards](../glossary/agent-card.md) for capability discovery, with long-running tasks, streaming and enterprise auth. A2A states explicitly that it and MCP address different problems.

# Terms
Glossary terms used here: [Agent Card](../glossary/agent-card.md).