An open protocol enabling communication and interoperability between opaque agentic applications.

The Agent2Agent (A2A) protocol addresses a critical challenge in the AI landscape: enabling gen AI agents, built on diverse frameworks by different companies running on separate servers, to communicate and collaborate effectively - as agents, not just as tools. A2A aims to provide a common language for agents, fostering a more interconnected, powerful, and innovative AI ecosystem.

With A2A, agents can:

• Discover each other's capabilities.
• Negotiate interaction modalities (text, forms, media).
• Securely collaborate on long running tasks.
• Operate without exposing their internal state, memory, or tools.

As AI agents become more prevalent, their ability to interoperate is crucial for building complex, multi-functional applications. A2A aims to:

• Break Down Silos: Connect agents across different ecosystems.
• Enable Complex Collaboration: Allow specialized agents to work together on tasks that a single agent cannot handle alone.
• Promote Open Standards: Foster a community-driven approach to agent communication, encouraging innovation and broad adoption.
• Preserve Opacity: Allow agents to collaborate without needing to share internal memory, proprietary logic, or specific tool implementations, enhancing security and protecting intellectual property.

• Standardized Communication: JSON-RPC 2.0 over HTTP(S).
• Agent Discovery: Via "Agent Cards" detailing capabilities and connection info.
• Flexible Interaction: Supports synchronous request/response, streaming (SSE), and asynchronous push notifications.
• Rich Data Exchange: Handles text, files, and structured JSON data.
• Enterprise-Ready: Designed with security, authentication, and observability in mind.

• 📚 Explore the Documentation: Visit the Agent2Agent Protocol Documentation Site for a complete overview, the full protocol specification, tutorials, and guides.
• 📝 View the Specification: A2A Protocol Specification
• Use the SDKs:
  • 🐍 A2A Python SDK pip install a2a-sdk
  • 🧑‍💻 A2A JS SDK npm install @a2a-js/sdk
  • ☕️ A2A Java SDK using maven
• 🎬 Use our samples to see A2A in action

We welcome community contributions to enhance and evolve the A2A protocol!

• Questions & Discussions: Join our GitHub Discussions.
• Issues & Feedback: Report issues or suggest improvements via GitHub Issues.
• Contribution Guide: See our CONTRIBUTING.md for details on how to contribute.
• Private Feedback: Use this Google Form.
• Partner Program: Google Cloud customers can join our partner program via this form.

• Agent Discovery:
  • Formalize inclusion of authorization schemes and optional credentials directly within the AgentCard.
• Agent Collaboration:
  • Investigate a QuerySkill() method for dynamically checking unsupported or unanticipated skills.
• Task Lifecycle & UX:
  • Support for dynamic UX negotiation within a task (e.g., agent adding audio/video mid-conversation).
• Client Methods & Transport:
  • Explore extending support to client-initiated methods (beyond task management).
  • Improvements to streaming reliability and push notification mechanisms.

The A2A Protocol is an open-source project by Google LLC, under the Apache License 2.0, and is open to contributions from the community.