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RT.Assistant is a voice-enabled multi-agent application built with .NET, F#, and the OpenAI Realtime API over WebRTC. It uses a custom RTFlow framework to orchestrate four specialized agents (Voice, CodeGen, Query, App) via a strongly-typed async message bus and deterministic state machine. A distinctive design choice is using Prolog (via the Tau engine embedded in a .NET MAUI HybridWebView) as a RAG alternative — natural language queries are translated into Prolog by an LLM and executed against a logic-programming knowledge base of telecom plans, reducing hallucination risk. The cross-platform UI is built with Fabulous for .NET MAUI, targeting iOS, Android, macOS, and Windows with ~90% shared code. The post details the architecture of each component: RTFlow's bus-star topology, RTOpenAI's WebRTC integration with strongly-typed event handling, Fabulous's functional-reactive UI model, and the Prolog-based query pipeline with LLM code generation and retry logic.

RT.Assistant: A Multi-Agent Voice Bot Using .NET and OpenAI