AG-UI Protocol now has a first-class .NET SDK

Microsoft has contributed a first-class C#/.NET SDK for the AG-UI Agent-User Interaction Protocol, bringing version 1.0 packages to NuGet and consolidating protocol support previously embedded in Microsoft Agent Framework. AG-UI standardizes the event stream between AI agent backends and user-facing clients, covering lifecycle activities such as streamed text, tool calls, state changes, subagents, interrupts, and run completion, enabling clients to work independently of the backend language or framework. The SDK includes server tooling to expose any .NET IChatClient-based agent as an AG-UI endpoint and client tooling that lets .NET applications consume endpoints written in C#, TypeScript, or Python, with Server-Sent Events as the default transport and optional protobuf support. Microsoft Agent Framework now relies on these shared packages while retaining ASP.NET Core integrations, with minor API renames but unchanged wire compatibility for existing frontends. The release enables .NET services, internal APIs, and business applications to expose agents across web, terminal, mobile, Slack, and Teams interfaces without requiring a specific agent framework.

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