Zei World

An MCP server that exposes ESG/CSR data from Zei World to LLMs. Browse sectors, search companies, compare ESG scores, and explore detailed evaluation criteria — all through natural language.

Tools

Tool	Description
list_sectors	List all ESG/CSR sectors
list_activities	List activities (sub-categories) within a sector
list_companies_by_activity	List ranked companies in an activity (paginated)
search_company	Search for a company by name
get_company_profile	Get a company's ESG profile (E/S/G scores, classifications)
get_company_criteria	Get detailed evaluation criteria for a company in a category
compare_companies	Compare 2–5 companies side by side
get_activity_ranking	Get the full ranking within an activity, optionally by category

Quick start

npm install
npm run build

Stdio (local MCP client)

npm start

Use with any MCP-compatible client (e.g. Claude Desktop). Add to your client config:

{
  "mcpServers": {
    "zei-world": {
      "command": "node",
      "args": ["/absolute/path/to/zei-world-mcp/build/index.js"]
    }
  }
}

HTTP (local testing)

npm run start:http

Server listens on http://localhost:3000/mcp. Stateless mode — every POST gets a fresh server instance.

curl -X POST http://localhost:3000/mcp \
  -H "Content-Type: application/json" \
  -H "Accept: application/json, text/event-stream" \
  -d '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2025-03-26","capabilities":{},"clientInfo":{"name":"test","version":"0.1"}}}'

Docker

npm run build
docker build -t zei-world-mcp .
docker run -p 3000:3000 zei-world-mcp

Vercel

The project includes a serverless handler at api/mcp.ts with a vercel.json config. Deploy by connecting the repo to Vercel — the endpoint will be available at /mcp.

Examples

Once connected to an MCP client, you can ask questions in natural language. Here are a few things you can try:

What ESG sectors are available on Zei World?

Uses list_sectors to return all 31 sectors.

Show me the activities in the food & agriculture sector

Uses list_activities to list sub-categories like organic farming, breweries, dairy, etc.

Search for "Hopaal"

Uses search_company to find the sustainable fashion brand and return its ID.

What's the ESG profile of Comme Avant?

Uses get_company_profile to show their scores (72% on Environment) and classifications across E/S/G.

How does Les 2 Marmottes score on environmental criteria?

Uses get_company_criteria with category Environnement to show each criterion, its coefficient, and score.

Compare Hopaal and Balzac Paris on their ESG scores

Uses compare_companies to display a side-by-side comparison of both fashion brands.

Who are the top-ranked eco-friendly banks?

Uses list_activities to find banking, then get_activity_ranking to list OnlyOne, Goodvest, Green-Got, and Helios.

Show me the governance ranking for cosmetics brands

Chains list_activities to find the right activity, then get_activity_ranking with category Gouvernance.

Project structure

src/
  index.ts          # Stdio entry point
  server.ts         # createServer() factory (shared by stdio + HTTP)
  local-http.ts     # Local HTTP server for testing
  types.ts          # Zod schemas and TypeScript types
  cache.ts          # In-memory cache
  fetcher.ts        # HTTP fetcher for zei.world
  tools/            # One file per MCP tool
  scraper/          # HTML scrapers for zei.world pages
api/
  mcp.ts            # Vercel serverless handler

Disclaimer

This server works by scraping the public zei.world website. It relies heavily on the current HTML structure of the site and may break without warning if Zei World changes their pages. This project is not affiliated with or endorsed by Zei World.

License

MIT