AI Agents are applications that can reason, use tools, manage memory, and take action to achieve goals. In this course you’ll learn how to build them in C#. Starting with the fundamentals of Large Language Models (LLMs) and prompt engineering, you’ll progress to implementing tool use, reasoning loops, and context management, before creating full agents that automate tasks like managing invoices. You’ll also learn how to integrate OpenAI, Anthropic Claude, and Google Gemini into your .NET projects using Microsoft.Extensions.AI, and finish by building a Model Context Protocol (MCP) server to connect your agents with clients like Claude.ai. By the end of this course, you’ll have the skills and source code to create your own powerful AI agents in C#.