Mapping Agentic AI Protocols to the OSI Stack: What Fits, What Doesn't
In 1984, ISO published the OSI Reference Model. Seven layers, clean diagram, still on every networking whiteboard forty years later. But OSI never shipped a single production packet. TCP/IP was already running the internet by the time OSI showed up. TCP/IP won the deployment race. OSI ended up winning something else: the vocabulary everyone still uses to talk about networks, including networks that don't run OSI at all.
Agentic AI looks like it's heading into a similar split, though it's too early to say how it lands.
MCP, A2A, ACP, AG-UI, ANP are already in production. Teams are wiring these together right now to let agents reach tools, reach each other, and reach people. What's missing is a shared layered model for how all of this fits together, the kind of model networking eventually got from OSI. This piece tries to build one: take the OSI stack, place agent protocols...
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