The Protocol for the Agentic Web

What is A2A?

Agent-to-Agent (A2A) is the open standard that enables AI agents to discover, understand, and interact with each other without human intervention.

Think of it as the "HTTP for AI Agents"—a universal language that transforms isolated software into a collaborative ecosystem.

Zervice Focus

Discovery Layer

Zervice Global Registry

DISCOVER

A2A Protocol Domain

CLIENT

User Agent

Consumer

HANDSHAKE

VERIFYING DID...

PROVIDER

Service Agent

Provider

Discovery

Zervice's Core Focus: Finding the right agent using sematic search on the registry.

Auth

Handshake using DIDs (Decentralized IDs) to verify ownership without central servers.

Transport

Standard HTTP/JSON exchanges. No proprietary tunnels or complex networking.

Beyond the Website

While A2A helps websites become agent-ready, the protocol itself is strictly transport-agnostic. It's a pure definition of how autonomous entities should:

1
Define capabilities in a machine-readable schema (Agent Card).
2
Negotiate context window sizes and pricing before exchanging data.
3
Verify identity using cryptographic signatures (DID/VC methods).

The Core Interface

Interface Definition (IDL)

interface Agent {

id: DID;
capabilities: Capability[];
negotiate(offer: Offer): Promise<Agreement>;

}

This abstract interface can be implemented over HTTP, WebSocket, gRPC, or even Bluetooth.

Implementation Flow

For web developers, we map these abstract concepts to simple HTTP endpoints and JSON files.

1. Declare

Developers publish an Agent Card (manifest) at a well-known URL path (e.g. /.well-known/agent-card.json) describing their agent's capabilities.

2. Discover

Agents query the Zervice Registry or use DNS-based resolution to find other agents that match their needs using semantic search.

3. Interact

Agents authenticate and communicate directly via standard APIs defined in the manifest, executing complex workflows autonomously.

Supported Standards

Zervice is protocol-agnostic. We support the leading agent standards and automatically index them all.

Protocol / Standard	Manifest Location	Priority	Reference
A2A Standard	`/.well-known/agent-card.json`	1 (Highest)	Spec
MCP (Model Context Protocol)	`/.well-known/mcp.json`	2	Docs
OpenAI Plugin	`/.well-known/ai-plugin.json`	3	Guide
Zervice Custom	`/.well-known/agents.json`	4	Our Spec

The Shift: From Websites to Agents

For 30 years, we built websites for human eyes. We optimized for clicks, eyeballs, and retention.

But the audience is changing. AI agents are the new users. They don't need beautiful CSS or animations; they need structured data, clear capabilities, and well-defined actions.

Turning your website into an A2A-compliant Agent makes you a citizen of this new economy.

Be discoverable by Siri, ChatGPT, and autonomous agents
Automate customer transactions without building new UIs
Unlock a new, programmatic revenue channel

Don't be invisible to AI

If your service is only HTML, AI agents have to "guess" (scrape) how to use it. With A2A, you give them a manual.

a2a_check: PASSED

> Agent Found: "Travel_Booking_Agent"

> Capability: "book_flight"

> Status: CONNECTED

Ready for the Agentic Era?

Transform your website into an intelligent agent today. Join the registry and be part of the A2A network.