A2A Protocol Implementation Patterns

Instructions

This skill provides comprehensive patterns for implementing the Agent2Agent (A2A) protocol in Google's Agent Development Kit (ADK). The A2A protocol standardizes communication between AI agents, enabling multi-agent collaboration across different platforms and frameworks.

What is A2A?

The Agent2Agent (A2A) protocol enables AI agents to:

• Discover each other's capabilities through Agent Cards
• Communicate securely using standardized JSON-RPC messages
• Collaborate across different frameworks (CrewAI, LangGraph, ADK)
• Work across deployment platforms (Cloud Run, Agent Engine, GKE)

Key Concept: A2A focuses on agent-to-agent collaboration in natural modalities, complementing MCP (Model Context Protocol) which handles tool/data connections.

Core Patterns

1. Exposing Agents via A2A (Server-Side)