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

Microsoft on September 25 announced a .NET SDK for AG-UI (Agent-User Interaction). Created in collaboration with CopilotKit , 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 alongside the TypeScript and Python SDKs, and is published on NuGet under the MIT license.