Launch History, Standards, And Implementation Playbooks.

This protocol collection has been expanded with launch context, maintainers, official docs, third-party references, and implementation guidance for major CMS and composable web stacks.

Protocol Pages

MCP (Model Context Protocol)

Anthropic-led open standard for model-to-tool/data integration.

WebMCP

Web platform proposal for browser-native agent tool exposure.

A2A (Agent2Agent)

Open agent interoperability protocol, launched by Google Cloud and partners.

UCP (Universal Commerce Protocol)

Open standard for agentic commerce flows across platforms and merchants.

ACP (Agent Communication / Client Protocols)

Important ACP landscape: Agent Communication Protocol and Agent Client Protocol.

NLWeb

Microsoft open project for natural language interfaces on the web.