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- Add `.gitignore` files to all 19 examples (`node_modules/`, `dist/`) - Replace custom `log` objects with standard `console` methods - Add `ontoolcancelled` handler to all `basic-server-*` examples - Add host styling integration (`applyDocumentTheme`, `applyHostFonts`, `applyHostStyleVariables`) to non-React `basic-server-*` examples - Add section headers for better code organization in feature examples - Update READMEs with Build System section explaining single-file bundling These changes make examples more consistent and easier to adapt. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com> |
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Example: Basic Server (React)
An MCP App example with a React UI.
Tip
Looking for a vanilla JavaScript example? See
basic-server-vanillajs!
Overview
- Tool registration with a linked UI resource
- React UI using the
useApp()hook - App communication APIs:
callServerTool,sendMessage,sendLog,openLink
Key Files
server.ts- MCP server with tool and resource registrationmcp-app.html/src/mcp-app.tsx- React UI usinguseApp()hook
Getting Started
npm install
npm run dev
How It Works
- The server registers a
get-timetool with metadata linking it to a UI HTML resource (ui://get-time/mcp-app.html). - When the tool is invoked, the Host renders the UI from the resource.
- The UI uses the MCP App SDK API to communicate with the host and call server tools.
Build System
This example bundles into a single HTML file using Vite with vite-plugin-singlefile — see vite.config.ts. This allows all UI content to be served as a single MCP resource. Alternatively, MCP apps can load external resources by defining _meta.ui.csp.resourceDomains in the UI resource metadata.