GitHub Style Markdown Preview MCP App

GitHub Style Markdown Preview MCP App

Enables the previewing of GitHub Flavored Markdown (GFM) as an MCP application. It provides a tool to render and visualize Markdown content using authentic GitHub styling and CSS.

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README

GitHub Style Markdown Preview MCP App

GitHub Flavored Markdown (GFM) preview as an MCP App.

Docs: https://modelcontextprotocol.io/docs/extensions/apps

Usage

npm run build    # Build UI and server
npm run serve    # Start server on http://localhost:3001/mcp
npm run dev      # Build & serve with watch mode

Connect to Claude

  1. Start the tunnel:

    npx cloudflared tunnel --url http://localhost:3001

  2. Copy the generated URL (e.g., https://random-name.trycloudflare.com)

  3. In Claude web, go to Settings > Connectors > Add custom connector

  4. Enter the URL with /mcp path:

    https://<your-url>.trycloudflare.com/mcp

Packages

Dependencies

Package Description
@modelcontextprotocol/ext-apps MCP Apps SDK (server + client)
@modelcontextprotocol/sdk MCP SDK core
react, react-dom React UI framework
react-markdown Markdown renderer for React
remark-gfm GitHub Flavored Markdown plugin
github-markdown-css GitHub style CSS
express, cors HTTP server
zod Schema validation

Dev Dependencies

Package Description
vite Build tool
vite-plugin-singlefile Bundle into single HTML
@vitejs/plugin-react Vite React plugin
esbuild Server bundler
concurrently Run multiple commands
cross-env Cross-platform env vars
tsx TypeScript execution
typescript TypeScript compiler

Files

File Description
main.ts Entry point (HTTP/stdio transport)
server.ts MCP server with preview-markdown tool
mcp-app.html UI entry point
src/mcp-app.tsx React app using useApp hook
src/markdown.tsx Markdown component with GFM support
src/global.css GitHub markdown styling
vite.config.ts Vite bundler config
tsconfig.json TypeScript config
tsconfig.server.json Server build config

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