A2A

Part 4 of the Agentic NOC series. A cited timeline: MCP won the vertical axis in a year, A2A won the horizontal axis with a hundred-company tent, and ACP converged into A2A under the Linux Foundation rather than fragmenting the field. Why building on MCP plus A2A today is the safe bet.

Part 3 of the Agentic NOC series. The smallest real A2A agent: one skill, an Agent Card served at the well-known URL, and the actual message/send JSON-RPC captured live. The horizontal axis, one agent discovering and delegating to another, built from scratch, and how it composes with MCP.

Part 1 of the Agentic NOC series. It introduces the two protocols that let AI agents reach tools and each other, MCP (the vertical axis) and A2A (the horizontal axis), and the third, ACP, that converged into A2A, plus the mental model the whole series is built on.