Meet the A2Family
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Google has announced the A2Family, a suite of open source protocols for building and connecting AI agents. The family includes: A2A (Agent2Agent), an interoperability protocol now donated to the Linux Foundation that enables agents to communicate across frameworks and vendors; A2UI, a protocol for agents to generate rich, secure UIs without arbitrary code execution; AP2 (Agent Payments Protocol), which secures agent-initiated transactions using verifiable digital credentials; and UCP (Universal Commerce Protocol), which standardizes the full commerce journey for agentic systems. The Agent Development Kit (ADK), available in Python, TypeScript, Go, and Java, serves as the foundational framework tying these protocols together for production-grade agent deployments.
Table of contents
A2A: The cornerstone of agent interoperabilityA2UI: A protocol for agent-driven interfacesAP2: Securing the agent economyUCP: The common language for agentic commerceBringing it all together with ADKSort: