MCP solved tool calling. A2A solved coordination. What solves transport?
The history of distributed computing is one of protocol proliferation followed by consolidation.
Common Object Request Broker Architecture (CORBA), Distributed Component Object Model (DCOM), Java remote method invocation (RMI), and early simple object access protocol (SOAP) competed for the enterprise integration market in the late 1990s before representational state transfer (REST) quietly won by being simpler and HTTP-native.
Extensible Messaging and Presence Protocol (XMPP), Internet Relay Chat (IRC), and a dozen proprietary protocols fragmented real-time messaging before MG telemetry transport (MQTT) and WebSockets carved out their respective niches. Every new computing paradigm generates a burst of competing standards, then slowly converges as implementations accumulate and interoperability becomes economically necessary.
The AI agent ecosystem is currently in the proliferation phase. Four significant protocols have been published in the past eighteen months: Model context protocol (MCP) from Anthropic in late 2024, agent communication protocol (ACP) from IBM Research in March 2025, Agent2Agent...
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