Add MCP Apps hello world demo tool#24
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jerome3o-anthropic merged 2 commits intomainfrom Dec 7, 2025
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Implements a simple MCP Apps tool that returns an interactive React UI: - Add `mcp_apps_hello_world` tool with `_meta.ui/resourceUri` metadata - Add resource handler for `ui://hello-world/app.html` returning HTML - Create React app using `@modelcontextprotocol/ext-apps/react` hooks - Add Vite build tooling to bundle React apps into single HTML files The tool demonstrates the MCP Apps extension (SEP-1865) which allows MCP servers to return interactive UI that runs in the client. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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Summary
mcp_apps_hello_worldtool demonstrating the MCP Apps extension (SEP-1865)Details
New tool:
mcp_apps_hello_worldThe tool includes
_meta: { "ui/resourceUri": "ui://hello-world/app.html" }metadata which tells MCP clients to fetch and render the associated UI resource.React App (
src/apps/hello-world/)Simple React app using
@modelcontextprotocol/ext-apps/reacthooks:useApphook for host communicationBuild tooling
vite-plugin-singlefileto bundle React apps into single HTML filesbuild:appsscript integrated into mainbuildDependencies
@modelcontextprotocol/ext-appsfrom git (PR #84 with SDK 1.23+ compatibility fix)react,react-domvite,@vitejs/plugin-react,vite-plugin-singlefile(dev)Test plan
npm run buildsucceeds (including app bundling)npm run lintpassesnpm testpasses🤖 Generated with Claude Code