Term tag: Interoperability

Agent Communication Protocol (ACP)

ACP is the horizontal link between AI agents, where MCP is the vertical link to tools. IBM's REST spec, merged into A2A in August 2025.

Agent2Agent Protocol (A2A)

An open standard, governed by the Linux Foundation, that lets independent AI agents discover each other and delegate tasks across vendors and frameworks.

Agentic Commerce

Buying where an AI agent handles discovery, comparison and checkout. Two rival protocols split the market: ACP behind ChatGPT, UCP behind Google.