MCP Apps

Build interactive UIs that run inside MCP-enabled hosts. An MCP App combines an MCP tool with an HTML resource.

Core Concept

Every MCP App requires two linked parts:

Host calls tool → Server returns result → Host renders resource UI → UI receives result

1. Tool - Called by LLM/host, returns data
2. Resource - Serves bundled HTML UI (via ui:// scheme)
3. Link - Tool's _meta.ui.resourceUri references the resource

Get Reference Code

Clone the SDK for working examples: