AI Agent Protocols. What each one does.
MCP connects AI apps to tools. A growing set of protocols covers the rest: websites, other agents, shopping and payments. Each guide says who runs the protocol, how ready it is and what to do now.
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These protocols are new and change fast. Each page shows the date its facts were checked against the official spec or announcement.
AI Agent Protocols
The protocols, explained
WebMCP, A2A, agentic commerce, UCP, ACP and AP2, and how each relates to MCP.
A2A vs MCP in Depth: Architecture, Security and When to Use Each
A2A vs MCP compared in depth: what each connects, how messages, tasks and discovery differ, security models, governance and status as of November 2026.
Read the guide →AI Agent Protocols Compared: MCP, A2A, WebMCP, UCP, ACP and AP2 (2026)
MCP, A2A, WebMCP, UCP, ACP and AP2 compared in one table: what each connects, who runs it, status as of November 2026 and which businesses need each one.
Read the guide →Agent Payments Protocol (AP2) Explained: Mandates, FIDO and How It Fits A2A and MCP
AP2 explained: who runs the Agent Payments Protocol, how its mandates work, the move to the FIDO Alliance, and how it fits with A2A, MCP, UCP and x402.
Read the guide →Agentic Commerce Protocol (ACP) Explained: OpenAI, Stripe and ChatGPT Checkout
The Agentic Commerce Protocol from OpenAI and Stripe explained: beta status, what it covers, the ChatGPT Instant Checkout change and other "ACP" names.
Read the guide →How to Add WebMCP to Your Website: Tools, Security and Testing (2026)
What adding WebMCP to a website involves in November 2026: the registerTool API from the official explainer, what to expose, consent and security, and testing.
Read the guide →UCP vs ACP for Merchants: Google's and OpenAI's Commerce Protocols Compared
UCP vs ACP for merchants: who backs each, what they cover, where they run (Google AI Mode, Gemini, ChatGPT), November 2026 status and what to build.
Read the guide →Universal Commerce Protocol (UCP) Explained: Who Backs It and What Merchants Do
UCP explained for merchants: Google and Shopify's governance, what it covers (catalog, cart, checkout, orders), Shopify's move to /api/ucp/mcp and next steps.
Read the guide →WebMCP vs MCP: Browser Page Tools vs MCP Servers, and When You Need Each
WebMCP vs MCP compared for website owners: where each runs, who supports it, status as of November 2026, and when a site needs one, the other or both.
Read the guide →What Is Agentic Commerce? A Plain-English Guide for Store Owners
Agentic commerce explained for store owners: AI agents that search, compare and buy, the protocols behind them (UCP, ACP, AP2, MCP) and what to do now.
Read the guide →What Is WebMCP? How Websites Expose Tools to AI Agents in the Browser
WebMCP explained in plain English: who proposed it, how pages register tools for AI agents, its draft status and which browsers support it as of November 2026.
Read the guide →What Is the A2A Protocol? Agent2Agent Explained for Business
A2A explained in plain English: where Agent2Agent came from, who governs it now, Agent Cards and tasks, v1.0 status, and when a business needs it in 2026.
Read the guide →
FAQ
Common questions
Do I need all of these protocols?
Can you make our website ready for AI agents?
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