Host Application

In the MCP architecture, the host application is the end-user-facing program that integrates the language model and embeds the MCP client. Examples include Claude Desktop, VS Code with Copilot extensions, or a custom chat interface. The host manages the user interface, controls which MCP servers are connected, and decides how to present tool results to users. It is responsible for enforcing security policies — such as user consent dialogs — before passing tool results back to the model.