- TypeScript 76.4%
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4ff22d0097* Update `package.json` * Add TypeScript type checking to example build scripts Add `tsc --noEmit &&` before `vite build` in all example `package.json` files to catch type errors during builds. Previously, type errors in `server.ts` files were not detected because Vite/Bun transpile without type checking. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com> * Make `_meta` optional in `McpUiAppResourceConfig` The `_meta` and `ui` properties were required, causing TypeScript errors when calling `registerAppResource()` without providing metadata. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com> * Fix Zod type compatibility in `registerAppTool()` Use `ZodRawShapeCompat | AnySchema` from SDK's `zod-compat` module instead of raw `ZodRawShape` to resolve type errors when examples pass `ZodObject` schemas to `registerAppTool()`. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com> * Remove unused imports in example apps - `basic-server-react`: Remove unused `McpUiResourceTeardownResult` - `customer-segmentation-server`: Remove unused `PostMessageTransport` 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com> * Fix CI git install test for fork PRs Use `github.event.pull_request.head.repo.full_name` to correctly reference the fork repository when testing git installs from PRs. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.5 <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— 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/.