MCP implementation is trivial - I agree. But A2A will require a mesh like structure. Meaning its not just about north/south traffic. It will be about east/west traffic as agents coordinate with each other. That communication and coordination among agents will need to be robust and that's where a sidecar proxy built on top of Envoy will offer certain properties in a first-class way that Kong can't easily support today.

This was the insight behind Envoy's initial design. Handle north/south and east/west traffic equally well as a universal data plane.