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Please reload this page . modelcontextprotocol / ext-apps Public * Notifications You must be signed in to change notification settings * Fork 379 * Star 2.8k * Code * Issues 124 * Pull requests 83 * Discussions * Actions * Projects * Security and quality 0 * Insights Additional navigation options * Code * Issues * Pull requests * Discussions * Actions * Projects * Security and quality * Insights Files Expand file tree main Breadcrumbs * ext-apps * / examples / wiki-explorer-server / Copy path Directory actions More options More options Directory actions More options More options Latest commit   History History History main Breadcrumbs * ext-apps * / examples / wiki-explorer-server / Copy path Top Folders and files Name Name Last commit message Last commit date parent directory .. src src     .gitignore .gitignore     README.md README.md     grid-cell.png grid-cell.png     main.ts main.ts     mcp-app.html mcp-app.html     package.json package.json     screenshot.png screenshot.png     server.ts server.ts     tsconfig.json tsconfig.json     tsconfig.server.json tsconfig.server.json     vite.config.ts vite.config.ts     View all files README.md Outline Example: Wiki Explorer Visualizes Wikipedia link graphs using a force-directed layout. Explore how Wikipedia pages are connected by expanding nodes to reveal first-degree links. MCP Client Configuration Add to your MCP client configuration (stdio transport): { "mcpServers" : { "wiki-explorer" : { "command" : " npx " , "args" : [ " -y " , " --silent " , " --registry=https://registry.npmjs.org/ " , " @modelcontextprotocol/server-wiki-explorer " , " --stdio " ] } } } Local Development To test local modifications, use this configuration (replace ~/code/ext-apps with your clone path): { "mcpServers" : { "wiki-explorer" : { "command" : " bash " , "args" : [ " -c " , " cd ~/code/ext-apps/examples/wiki-explorer-server && npm run build >&2 && node dist/index.js --stdio " ] } } } Features * Force-directed graph visualization : Interactive graph powered by force-graph * Node expansion : Click any node to expand and see all pages it links to * Visual state tracking : Nodes change color based on state (blue = default, green = expanded, red = error) * Direct page access : Open any Wikipedia page in your browser Running * Install dependencies: npm install * Build and start the server: npm run start:http # for Streamable HTTP transport # OR npm run start:stdio # for stdio transport * View using the basic-host example or another MCP Apps-compatible host. Tool Input To test the example, call the get-first-degree-links tool with a Wikipedia URL: { "url" : " https://en.wikipedia.org/wiki/Graph_theory " } Click nodes in the graph to Open (view in browser) or Expand (visualize linked pages). Architecture Server ( server.ts ) MCP server that fetches Wikipedia pages and extracts internal links. Exposes one tool: * get-first-degree-links - Returns links to other Wikipedia pages from a given page App ( src/mcp-app.ts ) Vanilla TypeScript app using force-graph for visualization that: * Receives tool inputs via the MCP App SDK * Renders an interactive force-directed graph * Supports node expansion to explore link relationships Footer (c) 2026 GitHub, Inc. Footer navigation * Terms * Privacy * Security * Status * Community * Docs * Contact * Manage cookies * Do not share my personal information You can’t perform that action at this time.