Originally published on AI Tech Connect.
What changed in the last sixty days If you stepped away from agent tooling for the first quarter of 2026, you came back to a different stack. OpenAI used its March platform update to ship the open-source Agents SDK and the new Responses API — a deliberate consolidation that folds in the tool-use ergonomics of the soon-to-be-deprecated Assistants API. Google countered in April with Agent Development Kit (ADK), including the Java 1.0 release that introduced an app and plugin architecture, event compaction, and a long roster of first-party tools (GoogleMapsTool, UrlContextTool, ContainerCodeExecutor, ComputerUseTool). Anthropic published the Claude Agent SDK alongside Claude 4.6, then layered Managed Agents on top — a hosted, long-horizon execution surface with durable sessions and stable…
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