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89a684546b* fix(examples): resolve DIST_DIR path for npm package execution When servers are compiled to dist/server.js and published to npm, `import.meta.dirname` already points to dist/, so joining with "dist" results in dist/dist/ which doesn't exist. This fix detects whether we're running from TypeScript source or compiled JavaScript and adjusts the path accordingly: - From source (server.ts): use dist/ subdirectory - From compiled (dist/server.js): use current directory Fixes ENOENT errors like: "ENOENT: no such file or directory, open '.../dist/dist/mcp-app.html'" 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com> * fix(pdf-server): mark pdfjs-dist as external in bundle The pdf.worker.mjs file wasn't being found when running from npm because bun bundled pdfjs-dist but didn't include the worker file. By marking pdfjs-dist as external, it uses the installed package from node_modules at runtime where the worker is available. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com> |
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Example: Interactive Map
Interactive 3D globe viewer using CesiumJS with OpenStreetMap tiles. Demonstrates geocoding integration and full MCP App capabilities.
Features
- 3D Globe Rendering: Interactive CesiumJS globe with rotation, zoom, and 3D perspective
- Geocoding: Search for places using OpenStreetMap Nominatim (no API key required)
- OpenStreetMap Tiles: Uses free OSM tile server (no Cesium Ion token needed)
- Dynamic Loading: CesiumJS loaded from CDN at runtime for smaller bundle size
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-hostexample or another MCP Apps-compatible host.
Tools
geocode
Search for places by name or address. Returns coordinates and bounding boxes.
{
"query": "Eiffel Tower"
}
Returns up to 5 matches with lat/lon coordinates and bounding boxes.
show-map
Display the 3D globe zoomed to a bounding box.
{
"west": 2.29,
"south": 48.85,
"east": 2.3,
"north": 48.86,
"label": "Eiffel Tower"
}
Defaults to London if no coordinates provided.
Architecture
Server (server.ts)
Exposes two tools:
geocode- Queries OpenStreetMap Nominatim API with rate limitingshow-map- Renders the CesiumJS globe UI at a specified location
Configures Content Security Policy to allow fetching tiles from OSM and Cesium CDN.
App (src/mcp-app.ts)
Vanilla TypeScript app that:
- Dynamically loads CesiumJS from CDN
- Initializes globe with OpenStreetMap imagery (no Ion token)
- Receives tool inputs via the MCP App SDK
- Handles camera navigation to specified bounding boxes
Key Files
server.ts- MCP server with geocode and show-map toolsmcp-app.html/src/mcp-app.ts- CesiumJS globe UIserver-utils.ts- HTTP server utilities
Notes
- Rate limiting is applied to Nominatim requests (1 request per second per their usage policy)
- The globe works in sandboxed iframes with appropriate CSP configuration
- No external API keys required - uses only open data sources