Agent2Agent Protocol

Agent2Agent Protocol How-To Guides

This section provides practical guides for working with the Agent2Agent (A2A) protocol in AgentHub. These guides show you how to implement A2A-compliant communication patterns for building robust agent systems.

Available Guides

Working with A2A Messages

Learn how to create, structure, and process A2A messages with text, data, and file content parts. This is the foundation for all A2A communication.

Working with A2A Conversation Context

Understand how to manage conversation contexts for multi-turn interactions, workflow coordination, and state preservation across agent communications.

Working with A2A Artifacts

Master the creation and handling of A2A artifacts - structured outputs that deliver rich results from completed tasks.

Working with A2A Task Lifecycle

Learn how to manage the complete task lifecycle from creation through completion, including state transitions, progress updates, and error handling.

A2A Protocol Benefits

The Agent2Agent protocol provides:

• Structured Communication: Standardized message formats with rich content types
• Conversation Threading: Context-aware message grouping for complex workflows
• Rich Artifacts: Structured outputs with multiple content types
• Lifecycle Management: Complete task state tracking from submission to completion
• Interoperability: Standards-based communication for multi-vendor agent systems

Prerequisites

Before following these guides:

1. Complete the Installation and Setup tutorial
2. Run the AgentHub Demo to see A2A in action
3. Understand the Agent2Agent Principle

Implementation Approach

These guides use AgentHub’s unified abstractions from internal/agenthub which provide:

• A2ATaskPublisher: Simplified A2A task creation and publishing
• A2ATaskSubscriber: Streamlined A2A task processing and response generation
• Automatic Observability: Built-in tracing, metrics, and logging
• Environment Configuration: Zero-config setup with environment variables

Start with the A2A Messages guide to learn the fundamentals, then progress through the other guides to build complete A2A-compliant agent systems.