A2A + MCP Ecosystem with 6 Live servers: Moving towards Agentic Mesh

[vishalmysore]

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What I Built

I've created a complete A2A+MCP mesh ecosystem with 6 live servers, each implementing dual protocols for agent communication:

🔄 The Ecosystem:

1. Car Booking Service: Handles vehicle reservations with A2A/MCP integration
2. Laundry Service: MongoDB-backed service with RAG capabilities
3. Customer Service: Spring Boot-based agent orchestration
4. Web Automation Service: Selenium-powered web interaction
5. Database Operations Service: Java DB integration service
6. Browser Automation Service: Playwright-based automation

How I Built It

Development Journey

1. Protocol Implementation

   • Started with basic A2A protocol for agent communication
   • Added MCP support for model context handling
   • Unified both protocols into a mesh architecture

2. Language Selection

   • Chose JVM languages for enterprise-grade stability
   • Leveraged Scala for data processing
   • Used Kotlin for reactive components
   • Implemented core infrastructure in Java
   • Added Groovy for dynamic scripting needs

3. Integration Strategy

   • Built each server independently first
   • Gradually connected them through the mesh
   • Implemented protocol translation layers
   • Added security and monitoring

Challenges I Faced

1. Protocol Compatibility

   • Challenge: A2A and MCP had different message formats
   • Solution: Created a unified message translation layer
   • Learning: Protocol adaptation is crucial for interoperability

2. Performance Optimization

   • Challenge: Initial high latency in cross-agent communication
   • Solution: Implemented message queuing and load balancing
   • Learning: Asynchronous communication is essential for scale

3. Security Implementation

   • Challenge: Maintaining security across different protocols
   • Solution: Unified RBAC system with protocol-specific handlers
   • Learning: Security needs to be protocol-aware

Key Learnings

1. Architecture Decisions

   • Start with clear protocol specifications
   • Design for extensibility from day one
   • Keep core components language-agnostic

2. Development Tips

   • Build and test each component in isolation
   • Implement comprehensive logging early
   • Use feature flags for gradual rollout

3. Integration Insights

   • Protocol translation is better than protocol forcing
   • Mesh topology needs to be flexible
   • Monitor everything, especially cross-protocol calls

Tips for Others

If you're building something similar, here's what helped me:

1. Start Small

   • Begin with one protocol implementation
   • Add the second protocol gradually
   • Test extensively before connecting to mesh

2. Development Approach

   • Use dependency injection for flexibility
   • Implement comprehensive error handling
   • Build monitoring from the start
   • Write tests for protocol edge cases

3. Avoid Common Pitfalls

   • Don't force synchronous communication
   • Don't ignore protocol version compatibility
   • Don't skip security at the protocol level

Live Demos & Implementation

You can see the system in action through these live demos:

1. Browser Automation Service

   • Demo: a2aPw
   • Shows: Real-time protocol translation in action

2. Database Operations Service

   • Demo: a2amcpdatabase
   • Shows: Java DB integration with A2A/MCP

3. Customer Service Agent

   • Demo: a2amcpspring
   • Shows: Spring Boot agent orchestration

4. Web Automation Service

   • Demo: a2amcpselenium
   • Shows: Selenium web interaction with dual protocol support

5. Laundry Service Agent

   • Demo: a2aMCPMongo
   • Shows: MongoDB-backed service with RAG capabilities

6. Car Booking Service

   • Demo: a2amcpdemo
   • Shows: Vehicle reservation service with A2A/MCP integration

Open Source Code

I've open-sourced the implementations in multiple languages:

• Scala: a2aScala
• Kotlin: a2a-kotlin
• Groovy: a2aGroovy

Future Improvements

Based on my experience, here are areas I'm looking to enhance:

1. Performance

   • Implement better caching strategies
   • Optimize protocol translation
   • Add distributed tracing

2. Features

   • Add more AI model integrations
   • Implement advanced routing algorithms
   • Enhance security features

I'm sharing this to help others who might be building similar systems. Feel free to explore the demos, try out the code, and reach out with questions. I'm happy to discuss challenges, share more learnings, or help troubleshoot issues!

Relevant Links

https://github.com/vishalmysore/a2ajava