Agentic Protocols And Interoperability Standards Including Model Context Protocol

via “complementary protocol composition with mcp (model context protocol)”

Agent2Agent (A2A) is an open protocol enabling communication and interoperability between opaque agentic applications.

Unique: Explicitly documents A2A and MCP as complementary protocols with defined integration patterns, rather than competing standards — enabling layered architectures where agents coordinate via A2A while LLMs invoke tools via MCP

vs others: More comprehensive than single-protocol approaches (A2A-only or MCP-only) and more explicit than implicit protocol stacking, providing clear guidance on when and how to use each protocol