b4642b4338Update all documentation links from `modelcontextprotocol.github.io/ext-apps` to the new custom domain across README.md, docs/, and example READMEs. Add `cname` to the `peaceiris/actions-gh-pages` deploy action in `.github/workflows/docs.yml` so the CNAME file persists across deploys. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
105 lines
3.2 KiB
Markdown
105 lines
3.2 KiB
Markdown
# Example: Wiki Explorer
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Visualizes Wikipedia link graphs using a force-directed layout. Explore how Wikipedia pages are connected by expanding nodes to reveal first-degree links.
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<table>
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<tr>
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<td><a href="https://apps.extensions.modelcontextprotocol.io/screenshots/wiki-explorer-server/01-zoomed.png"><img src="https://apps.extensions.modelcontextprotocol.io/screenshots/wiki-explorer-server/01-zoomed.png" alt="Zoomed" width="100%"></a></td>
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<td><a href="https://apps.extensions.modelcontextprotocol.io/screenshots/wiki-explorer-server/02-pop-up.png"><img src="https://apps.extensions.modelcontextprotocol.io/screenshots/wiki-explorer-server/02-pop-up.png" alt="Pop-up" width="100%"></a></td>
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<td><a href="https://apps.extensions.modelcontextprotocol.io/screenshots/wiki-explorer-server/03-expanded-graph.png"><img src="https://apps.extensions.modelcontextprotocol.io/screenshots/wiki-explorer-server/03-expanded-graph.png" alt="Expanded graph" width="100%"></a></td>
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</tr>
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</table>
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## MCP Client Configuration
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Add to your MCP client configuration (stdio transport):
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```json
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{
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"mcpServers": {
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"wiki-explorer": {
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"command": "npx",
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"args": [
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"-y",
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"--silent",
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"--registry=https://registry.npmjs.org/",
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"@modelcontextprotocol/server-wiki-explorer",
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"--stdio"
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]
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}
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}
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}
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```
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### Local Development
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To test local modifications, use this configuration (replace `~/code/ext-apps` with your clone path):
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```json
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{
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"mcpServers": {
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"wiki-explorer": {
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"command": "bash",
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"args": [
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"-c",
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"cd ~/code/ext-apps/examples/wiki-explorer-server && npm run build >&2 && node dist/index.js --stdio"
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]
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}
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}
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}
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```
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## Features
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- **Force-directed graph visualization**: Interactive graph powered by [`force-graph`](https://github.com/vasturiano/force-graph)
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- **Node expansion**: Click any node to expand and see all pages it links to
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- **Visual state tracking**: Nodes change color based on state (blue = default, green = expanded, red = error)
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- **Direct page access**: Open any Wikipedia page in your browser
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## Running
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1. Install dependencies:
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```bash
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npm install
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```
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2. Build and start the server:
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```bash
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npm run start:http # for Streamable HTTP transport
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# OR
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npm run start:stdio # for stdio transport
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```
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3. View using the [`basic-host`](https://github.com/modelcontextprotocol/ext-apps/tree/main/examples/basic-host) example or another MCP Apps-compatible host.
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### Tool Input
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To test the example, call the `get-first-degree-links` tool with a Wikipedia URL:
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```json
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{
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"url": "https://en.wikipedia.org/wiki/Graph_theory"
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}
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```
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Click nodes in the graph to **Open** (view in browser) or **Expand** (visualize linked pages).
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## Architecture
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### Server (`server.ts`)
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MCP server that fetches Wikipedia pages and extracts internal links.
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Exposes one tool:
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- `get-first-degree-links` - Returns links to other Wikipedia pages from a given page
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### App (`src/mcp-app.ts`)
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Vanilla TypeScript app using force-graph for visualization that:
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- Receives tool inputs via the MCP App SDK
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- Renders an interactive force-directed graph
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- Supports node expansion to explore link relationships
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