Microsoft releases .NET SDK for AG-UI agent-user interaction protocol

Microsoft announced a .NET SDK for the AG-UI (Agent-User Interaction) protocol on September 25, created with CopilotKit and published on NuGet under the MIT license. The SDK ships as five packages — AGUI.Abstractions, AGUI.Formatting, AGUI.Protobuf, AGUI.Client, and AGUI.Server — and lets C# developers build agents that emit AG-UI events and consume AG-UI endpoints from any .NET service. AG-UI support for .NET in the Microsoft Agent Framework is now based on the new SDK.

Microsoft on September 25 announced https://devblogs.microsoft.com/dotnet/ag-ui-dotnet-sdk/ a .NET SDK for AG-UI Agent-User Interaction . Created in collaboration with CopilotKit https://www.copilotkit.ai/ , the new SDK allows C developers to work with the protocol that standardizes how agents communicate with user-facing applications. The .NET SDK for AG-UI lives in the AG-UI repository https://github.com/ag-ui-protocol/ag-ui/tree/main/sdks/dotnet alongside the TypeScript https://www.infoworld.com/article/2257305/what-is-typescript-strongly-typed-javascript.html and Python https://www.infoworld.com/article/4020500/python-powered-ai-agents-are-here.html SDKs, and is published on NuGet under the MIT license. Its C implementation of AG-UI is usable from any .NET service, Microsoft said. AG-UI support for .NET in the Microsoft Agent Framework MAF is now based on the .NET SDK for AG-UI, the company added. AG-UI is an event-based protocol that allows AI agents to interact with front-end applications. A back end emits AG-UI events natively, and a client consumes them from an agent written in any supported language. The protocol includes events in eight different categories, according to the documentation https://docs.ag-ui.com/concepts/events : The .NET SDK for AG-UI works in both directions, Microsoft said. AGUI.Server turns an agent into an AG-UI endpoint and AGUI.Client enables a .NET application to consume an AG-UI endpoint. AGUI.Server and AGUI.Client are built on a common set of AG-UI primitives. The .NET SDK for AG-UI ships as five packages on NuGet https://www.nuget.org/packages/AGUI.Abstractions : AGUI.Abstractions — protocol events, messages, tools, capabilities, and JSON serialization. AGUI.Formatting — event stream formatter abstractions and Server-Sent Events support. AGUI.Protobuf — protobuf codec and binary event stream formatting. AGUI.Client — AG-UI HTTP client and IChatClient integration. AGUI.Server — server-side adapter from ChatResponseUpdate streams to AG-UI events. Microsoft offered the following links for getting started: The company welcomes questions and feedback about the SDK in the AG-UI repository https://github.com/ag-ui-protocol/ag-ui . It asks that questions about Microsoft Agent Framework integration be directed to the Microsoft Agent Framework discussion boards https://github.com/microsoft/agent-framework/discussions .