The A2A Directory

Your comprehensive resource for Google's Agent-to-Agent (A2A) protocol implementations and servers.

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What is A2A?

Agent-to-Agent (A2A) is an open protocol developed by Google for enabling interoperability between AI agents.

The A2A protocol enables seamless communication between AI agents built on different frameworks and platforms. It allows agents to discover each other's capabilities, negotiate interaction methods, and collaborate securely, regardless of their underlying architecture or vendor.

A2A defines a standardized way for agents to communicate through HTTP APIs, supporting various content types including text, files, and structured data. This enables rich interactions between agents and facilitates complex multi-agent workflows.

With A2A, developers can build interoperable agent ecosystems where specialized agents can work together to solve complex problems, enhancing the capabilities and flexibility of AI systems.

Key Features

Explore the powerful capabilities of the A2A protocol

Agent Discovery

Utilizes Agent Cards—public metadata files that detail an agent's capabilities, skills, endpoint URL, and authentication requirements.

Task Management

Defines tasks as central units of work with unique IDs and standardized states, ensuring consistent handling across agents.

Flexible Communication

Supports various content types through Parts and Artifacts, including text, files, and structured data.

Real-time Updates

Offers streaming updates for long-running tasks via Server-Sent Events (SSE) and supports push notifications.

Standardized Format

Uses JSON for structured data exchange, making it easy to integrate with existing systems and frameworks.

Cross-Platform

Works across different platforms, languages, and frameworks, enabling true interoperability between diverse agent systems.

A2A Directory

A comprehensive listing of A2A implementations and servers.

Directory listings coming soon. Stay tuned for updates!

Official Resources

Learn more about A2A from these official sources

Google Announcement
Official announcement from Google Developers Blog
GitHub Repository
Source code and implementation examples
Technical Documentation
Detailed technical specifications and guides
JSON Specification
JSON schema and protocol details

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