Nod Server

This is how AI agents will interact with businesses — not by scraping, but by reading structured manifests. This reference MCP server teaches any MCP-compatible client (Claude Desktop, agent frameworks, IDEs) to read a business's nod.json manifest at https://{domain}/.well-known/nod.json and answer real questions about what the business can do: order food, book an appointment, search products, check pricing, and more.

It exposes two tools — lookup_nod and check_capability — and bundles four demo manifests served locally so the demo works out of the box with zero external dependencies.

Install

git clone <this repo> nod-mcp-server
cd nod-mcp-server
npm install
npm run build

Requires Node.js 20+.

Run the demo manifest server

Almost no real sites publish nod.json yet, so this repo bundles four example manifests (restaurant, e-commerce, SaaS, healthcare) and serves them locally.

npm run demo:manifests

You should see:

NOD demo manifest server listening on http://localhost:3456
  http://localhost:3456/demo-restaurant.localhost/nod.json
  http://localhost:3456/demo-shop.localhost/nod.json
  http://localhost:3456/demo-saas.localhost/nod.json
  http://localhost:3456/demo-health.localhost/nod.json

Leave this terminal running during the demo. The MCP server automatically routes any *.localhost domain to this server.

Configure Claude Desktop

Open (or create) ~/Library/Application Support/Claude/claude_desktop_config.json on macOS (or %APPDATA%\Claude\claude_desktop_config.json on Windows) and add:

{
  "mcpServers": {
    "nod": {
      "command": "node",
      "args": ["/ABSOLUTE/PATH/TO/nod-mcp-server/dist/index.js"]
    }
  }
}

Replace /ABSOLUTE/PATH/TO/nod-mcp-server with the full path to this checkout (e.g. /Users/you/projects/nod-mcp-server). Restart Claude Desktop. You should now see the nod server listed in Claude's tool picker with two tools: lookup_nod and check_capability.

60-second demo script

With the demo manifest server running in one terminal and Claude Desktop configured, paste these prompts into Claude one after another.

1. "Look up the NOD manifest for demo-restaurant.localhost"

Claude calls lookup_nod({ domain: "demo-restaurant.localhost" }) and returns something like:

# Pike Place Noodle House  (restaurant)
Hand-pulled noodles, dumplings, and regional Chinese classics...

- URL: https://demo-restaurant.localhost
- Manifest: http://localhost:3456/demo-restaurant.localhost/nod.json

## Declared capabilities
  - purchase
  - booking
  - view_menu
  - order_food
  - book_table

## Supported actions
  - purchase → https://demo-restaurant.localhost/api/orders [auth: api_key]
  - booking  → https://demo-restaurant.localhost/api/reservations [auth: api_key]
  - search   → https://demo-restaurant.localhost/api/menu/search [auth: none]

2. "Can I order food from demo-restaurant.localhost?"

Claude calls check_capability({ domain: "demo-restaurant.localhost", action: "order_food" }):

YES — demo-restaurant.localhost supports "order_food".
Manifest declares "order_food" under discovery.mcp_server.capabilities.

Endpoint: POST https://demo-restaurant.localhost/api/orders
Authentication: api_key
Matched via: discovery.mcp_server.capabilities

Constraints:
{ "require_human_confirmation": { "purchases_above": 150, ... },
  "rate_limits": { "transactions": { "requests": 10, "period": "minute" } },
  "allow_automated_purchases": true }

3. "What actions does demo-shop.localhost support?"

Claude calls lookup_nod({ domain: "demo-shop.localhost" }) and summarizes: product search, pricing, inventory checks, and OAuth2-protected order placement — with a human-confirmation threshold at $500 and a 60-day returns policy.

Bonus prompts

• "Book an appointment at demo-health.localhost — what does that flow require?" → returns the booking endpoint, required fields (patient_name, DOB, reason, provider_id, preferred_date), OAuth2 scopes, and the cancellation policy.
• "Does demo-saas.localhost allow automated purchases?" → returns NO with the human-fallback URL, because the manifest sets allow_automated_purchases: false.

Tool reference

lookup_nod

Input	Type	Description
domain	string	Domain only (no scheme, no path). *.localhost domains are routed to the bundled demo server.

Fetches https://{domain}/.well-known/nod.json, falling back to https://{domain}/nod.json. Returns a structured summary: business identity, declared capabilities, supported actions (with endpoints + auth), API endpoints, and contact methods. Returns a clear "no manifest found" message on failure.

check_capability

Input	Type	Description
domain	string	Domain only.
action	string	Common values: order_food, place_order, view_menu, book_table, book_appointment, search_products, find_provider, get_pricing, check_inventory, check_status, create_account, get_docs, contact_support.

Fetches the manifest and checks the action against transactions.capabilities, discovery.mcp_server.capabilities, support.contact.mcp_server.capabilities, and the structural endpoints (transactions.purchase, discovery.search, information.pricing, etc.). Returns a yes/no verdict, the endpoint URL, authentication method, and policy constraints (rate limits, human-confirmation thresholds).

How *.localhost routing works

When the MCP server receives a domain ending in .localhost, it fetches from http://localhost:3456/{domain}/nod.json instead of the normal well-known URL. This makes the demo self-contained — you can point Claude at demo-restaurant.localhost and get real results without any DNS or HTTPS setup.

Env vars:

• NOD_LOCAL_PORT — port the demo manifest server listens on (default 3456)
• NOD_LOCAL_MANIFEST_SERVER — base URL the MCP server uses for .localhost lookups (default http://localhost:3456)
• NOD_FORCE_LOCAL=1 — route every domain through the local manifest server (useful for contributors testing new example manifests)

What's next

Publish a nod.json for your own business using the NOD Protocol spec at opennod.ai/protocol. A minimal, valid manifest takes about 30 minutes to write — and once it's live at https://yourdomain.com/.well-known/nod.json, any agent using this MCP server (or any other NOD-aware client) will be able to discover your business and act on its capabilities.

License

MIT