MCP Apps

MCP Apps: Protocol extension that allows MCP servers to render interactive UIs inline inside chat clients.

MCP Apps provides a standardized protocol extension for building and rendering interactive user interfaces from MCP servers. It extends the Model Context Protocol by allowing tools to declare UI resources that render inline inside compliant chat clients like Claude and ChatGPT. The system uses a sandboxed iframe where the host fetches resources, and bidirectional communication passes data via notifications. The SDK serves app developers building interactive views, host developers embedding views, and server authors registering tools. Supported frameworks for starter templates include React, Vue, Svelte, Preact, Solid, and Vanilla JS.

MCP Apps at a glance

Best for: Software engineer
Runs on: Web, Node.js
Pricing: Free
Released: November 2025
Category: AI coding tool
Website: apps.extensions.modelcontextprotocol.io

Key features

Interactive UI rendering inside chat clients
Agent skills for scaffolding and migration
Sandboxed iframe display
Bidirectional communication via notifications
TypeScript and React hooks support
Node.js SDK and server packages

Use it for

Build interactive UIs for MCP tools
Convert web apps into hybrid MCP apps
Add UI components to existing MCP servers
Embed charts, forms, and dashboards in chat

Alternatives to MCP Apps

MCP Extensions — Enables developers to build plugins that integrate natively with ChatGPT.
MCP TypeScript SDK — Official TypeScript implementation of the Model Context Protocol.
Coding Tools MCP — Turns any chat app into a coding agent with strict workspace safety boundaries.
MCP Inspector — Test and debug MCP servers via web, CLI, and terminal interfaces.
Apple Docs 2.0 MCP — Read Apple documentation, design guidelines, and WWDC sessions directly in your AI assistant.
Mobile MCP — Connects AI agents directly to real mobile devices for automated testing and tasks.
Playwright MCP — Enables LLMs to interact with web pages using structured accessibility snapshots.
Magic MCP — Provides AI agents direct access to a catalog of 12,000+ React components.
MCP Python SDK — Builds protocol servers and clients using standard Python type hints.
MCP Java SDK — Official Java implementation with core STDIO, SSE, and Streamable HTTP transports.
Official MCP Servers — Find trusted official MCP servers without unofficial forks or abandoned projects.
FastMCP TS — Provides an open-source TypeScript framework for Model Context Protocol servers.

All MCP Apps alternatives