Google ADK 1.0 + A2A Protocol — Python/Go/Java/TypeScript GA, AgentCard, Task, and SSE Redefining the 2026 Multi-Agent Standard

Google ADK 1.0 + A2A Protocol - Python/Go/Java/TypeScript GA, AgentCard, Task, and SSE Redefining the 2026 Multi-Agent Standard At Google Cloud Next 2026 in April, the Agent Development Kit (ADK) graduated to 1.0 GA across four languages - Python, Go, Java, and TypeScript - simultaneously. In the same window, the Agent2Agent (A2A) protocol crossed 150+ organizations in production under the Linux Foundation, and Anthropic's MCP (donated to the Linux Foundation in December 2025) settled in as the de-facto standard for tool calls.