Building AI Agents in A2A and MCP: 5 Live Demos to Get You Started

Hey there! 👋 I'm excited to show you how to build AI agents using a2ajava, an open-source framework I created to make agent development fun and accessible. Instead of diving into theoretical stuff, let me walk you through 5 real, working agents I've built and deployed. Each demonstrates different aspects of what you can do with a2ajava.

What's a2ajava All About?

I built a2ajava because I wanted to make it super easy for developers to create AI agents without getting bogged down in protocol details. Whether you're into A2A or MCP protocols, a2ajava handles all the complexity so you can focus on building cool stuff.

🛠️ Quick Overview

Open source and community-driven
Works with both A2A and MCP protocols out of the box
Write your agents in Java, Kotlin, or Groovy
Plays nice with Gemini, OpenAI, Claude, and Grok
Simple annotation-based development

Let's Look at Some Real Agents!

1. Basic Spring Agent

🔗 Try it Live

This is the simplest agent I've built - perfect for getting started. It shows how to turn regular Spring services into AI agents with just a few annotations.

# Give it a try! List available tools:
curl -H "Content-Type: application/json" -d '{
    "jsonrpc": "2.0",
    "method": "tools/list",
    "params": {},
    "id": 1
}' https://vishalmysore-a2amcpspring.hf.space/

2. Multi-User Agent with Security

🔗 Try it Live

This one's cool - it shows how to handle different users and permissions. I built it to demonstrate how:

Different users can access different tools
@PreAuthorize annotations control access
agent.json changes based on who's asking
You can connect from Python or Java clients

3. Database Whisperer Agent

🔗 Try it Live

This is probably my favorite demo - it turns database operations into natural language conversations. Check this out:

# Create a database using plain English!
curl -u admin:admin -H "Content-Type: application/json" -d '{
    "jsonrpc": "2.0",
    "method": "tools/call",
    "params": {
        "name": "createDatabase",
        "arguments": {
            "provideAllValuesInPlainEnglish": {
                "name": "cookgpt"
            }
        }
    },
    "id": 25
}' https://vishalmysore-a2amcpdatabase.hf.space/

4. MongoDB RAG Agent

🔗 Try it Live

Ever wanted to build a RAG system with MongoDB? This agent shows how! Features I'm particularly proud of:

Vector search for semantic task matching
Stores and retrieves A2A tasks automatically
Simple REST API for everything
Built with Spring Boot because, why not?

5. Web Automation Agent

🔗 Try it Live

My latest experiment - combining Selenium with AI agents. Use it for:

Automated testing
Web scraping
Browser automation
Whatever else you can think of!

Getting Your Hands Dirty

Want to build something similar? It's easier than you think! Here's a super quick start:

Add a2ajava to your project:

<dependency>
    <groupId>io.github.vishalmysore</groupId>
    <artifactId>a2ajava</artifactId>
    <version>0.1.8.2</version>
</dependency>

Turn any class into an agent:

@Agent(groupName = "My Cool Agent")
public class MyAgent {
    @Action(description = "Does something awesome")
    public String doStuff() {
        return "Magic happens here!";
    }
}