MCP # 0020 # Build an AI-Powered MCP Host in Python - Let the LLM Decide Which Tool to Call

Description

#mcp #fastmcp #fastmcptutorials #mcptutorials #modelcontextprotocol #mcphost #mcpclient #mcpserver In this video, we will build our own AI-powered MCP Host from scratch in Python. This is the video where everything in this series comes together.In the previous video, we built an MCP Client that could list tools, call tools, read resources and fetch prompts — but we were the ones deciding in code which tool to call, with what arguments, and when. That is useful for understanding the API, but it is not how a real MCP Host works.A real MCP Host — like Claude Desktop — does not hardcode tool calls. It passes the user query to an LLM, the LLM looks at all the available tools, decides which one to call, constructs the arguments itself, and then the host executes that tool call and feeds the result back to the LLM to generate the final response.That is exactly what we will build today. Github Code: https://github.com/Sumanshu-Nankana/mcp-servers-playground/tree/main/mcp_host_12