A2A Protocol Tech Update — 2026/03/15

Version Dynamics

Latest Version: 1.0.0 (stable release). Previous: v0.3 with gRPC support. Governance: Linux Foundation (donated by Google in June 2025).

Technical Highlights

1. gRPC Support (v0.3+): New transport layer for high-performance enterprise deployments.

2. Signed Security Cards: Enhanced security with signed Agent Cards for agent identity verification.

3. Extended Python SDK: Improved client-side support with robust error handling.

4. Multi-Transport: HTTP+SSE, WebSocket, gRPC options.

Ecosystem Updates

• A2A donated to Linux Foundation on June 23, 2025
• Founding members: Google, Microsoft, AWS, Cisco, Salesforce, SAP, ServiceNow
• Adobe integration for enterprise content creation
• IBM ACP incorporated into A2A

A2A + MCP Synergy

MCP: Agent-to-tool. A2A: Agent-to-agent. Together: Foundation for agentic apps.

Resources

• https://a2a-protocol.org
• https://github.com/a2aproject/A2A

Tags: a2a, ai, agents, protocol