Enabling Agent Interoperability in the AI Era
The Open Standard for Agent Communication & Collaboration
An open protocol enabling communication and interoperability between opaque agentic applications
so agents across frameworks and vendors can communicate and collaborate securely.
Agent Discovery
Discover and identify agent capabilities via the Agent Card mechanism for automated service discovery and collaboration.
Standardized Interfaces
Three protocol bindings with one semantic model: JSON-RPC, gRPC, and HTTP+JSON, covering synchronous, streaming (SSE), and asynchronous (push notification) interaction.
Task Management
Complete task lifecycle management, supporting long-running tasks, real-time status updates, and result synchronization.
Enterprise-Grade Security
The Agent Card declares API key, HTTP, OAuth 2.0, OpenID Connect, and mTLS schemes, and supports signed Agent Cards and multi-tenancy.
Multi-Modal Support
Parts carry text, files, and structured JSON data, and media types let agents negotiate input and output modalities.
Open Ecosystem
Official SDKs for Python, Go, Java, JavaScript, .NET, and Rust, with integrations in LangGraph, CrewAI, ADK, and more.
Related Resources
A2A Documentation
Complete protocol specifications and development guides.
A2A Specifications
Detailed protocol definitions and implementation standards.
MCP Chinese Site
Model Context Protocol Chinese technology community.
AP2 Lab
Agent Payments Protocol Chinese community.
ACP Commerce
Agentic Commerce Protocol Chinese technology community.
ChatGPT Chinese
ChatGPT Chinese technology community.