Agent2Agent Protocol

Retired

No longer on the radar

We removed this entry in the September 2026 release. Retiring is not a recommendation against it — it means the radar no longer needs a separate opinion here. The write-up below is kept as it was last published and is no longer maintained.

This decision is now covered by:

Overview

The Agent2Agent (A2A) protocol is an open standard led by Google for agent discovery, capability advertisement, and task handoffs across vendor boundaries. It complements MCP by focusing on agent-to-agent collaboration rather than tool wiring alone (A2A specification).

Trial when you operate multiple agent platforms and need interoperable delegation without bespoke HTTP glue. Security and authZ for cross-tenant A2A remain your responsibility.

Sources