- TypeScript 76.4%
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d9006bd69a* feat: make MCP SDK a peer dependency - Move @modelcontextprotocol/sdk from dependencies to peerDependencies (^1.20.0) - Add to devDependencies for local development (^1.24.3) - Externalize SDK from all build entry points (app, app-bridge, react, server) Benefits: - Consumers control their SDK version - Deduplication when consumer already has SDK - Follows pattern of react/zod peer deps * fix: require SDK ^1.24.0 for Zod 4 compatibility Earlier SDK versions have Zod type incompatibilities that cause build errors. * chore: update examples to SDK ^1.24.0 to match peer dep |
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@modelcontextprotocol/ext-apps
This repo contains the SDK and specification for MCP Apps Extension (SEP-1865).
MCP Apps are a proposed standard inspired by MCP-UI and OpenAI's Apps SDK to allow MCP Servers to display interactive UI elements in conversational MCP clients / chatbots.
Overview
This SDK serves two audiences:
App Developers
Build interactive UIs that run inside MCP-enabled chat clients.
- SDK for Apps:
@modelcontextprotocol/ext-apps— API Docs - React hooks:
@modelcontextprotocol/ext-apps/react— API Docs
Host Developers
Embed and communicate with MCP Apps in your chat application.
- SDK for Hosts:
@modelcontextprotocol/ext-apps/app-bridge— API Docs
There's no supported host implementation in this repo (beyond the examples/basic-host example).
We have contributed a tentative implementation of hosting / iframing / sandboxing logic to the MCP-UI repository, and expect OSS clients may use it, while other clients might roll their own hosting logic.
Installation
npm install -S @modelcontextprotocol/ext-apps
Or edit your package.json manually:
{
"dependencies": {
"@modelcontextprotocol/ext-apps": "^0.0.1"
}
}
Examples
Start with these foundational examples to learn the SDK:
examples/basic-server-vanillajs— Example MCP server with tools that return UI Apps (vanilla JS)examples/basic-server-react— Example MCP server with tools that return UI Apps (React)examples/basic-host— Bare-bones example of hosting MCP Apps
The examples/ directory contains additional demo apps showcasing real-world use cases.
To run all examples together:
npm install
npm run examples:start
Then open http://localhost:8080/.