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Mirror of https://github.com/modelcontextprotocol/ext-apps — Official repo for spec & SDK of MCP Apps protocol - standard for UIs embedded AI chatbots, served by MCP servers
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Ido Salomon 9acc52cb96
 feat: enhance sandbox capability negotiation (#158) 
* feat: enhance sandbox capability negotiation

* Update specification/draft/apps.mdx

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* add all csp and permissions to host capabilities + update SEP

* feat: add clipboard-write permission support

Adds clipboardWrite to McpUiResourcePermissions for clipboard access.
Maps to Permission Policy 'clipboard-write' feature.

* rm files added by mistake

* refactor: change McpUiResourcePermissions properties to empty objects

* chore: remove scratch files and redundant cross-env dependency

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Olivier Chafik <ochafik@anthropic.com>
2026-01-12 15:10:27 +00:00
.github/workflows chore: release 0.3.1 (#224) 2026-01-09 18:22:27 +00:00
.husky Add pre-commit check for private registry URLs in package-lock.json (#133) 2025-12-16 13:41:50 +00:00
docs docs: fix tsc command to use tsconfig.json (#188) 2025-12-20 17:39:34 +02:00
examples feat: enhance sandbox capability negotiation (#158) 2026-01-12 15:10:27 +00:00
scripts fix: ensure lib is built before examples:build (#185) 2026-01-09 01:36:42 +00:00
specification/draft feat: enhance sandbox capability negotiation (#158) 2026-01-12 15:10:27 +00:00
src feat: enhance sandbox capability negotiation (#158) 2026-01-12 15:10:27 +00:00
tests/e2e examples: Add CesiumJS Map App example (#235) 2026-01-12 12:13:56 +00:00
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.prettierignore Add basic-server-* examples for Vue, Svelte, Preact, and Solid (#141) 2026-01-08 18:44:36 +00:00
.prettierrc.json api: optional Client in AppBridge (allow custom forwarding), better protocol types (AppRequest, AppNotification, AppResult) (#146) 2025-12-13 21:07:13 +00:00
build.bun.ts build app-with-deps (#221) 2026-01-09 01:26:31 +00:00
CONTRIBUTING.md tests: add Playwright E2E tests with screenshot golden testing (+ fix examples session handling) (#115) 2025-12-13 20:57:27 +00:00
LICENSE add license (#96) 2025-12-08 21:51:19 +01:00
package-lock.json feat: use structuredContent with outputSchema in example servers (#220) 2026-01-12 14:25:16 +00:00
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tsconfig.json Initial commit 2025-11-21 11:56:27 +00:00
typedoc.json Add Quickstart guide for building MCP Apps 2025-12-04 14:28:55 -06:00

README.md

@modelcontextprotocol/ext-apps

npm version API Documentation

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:

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/.

Resources