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ecc593bcec* chore: bump version to 0.3.0 Breaking changes: - `viewport` replaced with `containerDimensions` in host context New examples: - video-resource-server - sheet-music-server 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com> * fix(video-resource-server): add missing server-utils and fix import path The video-resource-server was importing from a non-existent ../shared/server-utils.js path. Added the server-utils.ts file and fixed the import to use ./src/server-utils.js like other examples. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com> * chore: update ext-apps version refs to 0.3.0 --------- Co-authored-by: Claude <noreply@anthropic.com> |
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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— MCP server + MCP App using vanilla JSexamples/basic-server-react— MCP server + MCP App using Reactexamples/basic-server-vue— MCP server + MCP App using Vueexamples/basic-server-svelte— MCP server + MCP App using Svelteexamples/basic-server-preact— MCP server + MCP App using Preactexamples/basic-server-solid— MCP server + MCP App using Solidexamples/basic-host— MCP host application supporting MCP Apps
The examples/ directory contains additional demo apps showcasing real-world use cases.
To run all examples together:
npm install
npm start
Then open http://localhost:8080/.