3dpacking MCP Server

3DPACK.ING MCP server

Container and truck load planning for AI assistants. Describe a shipment in plain English; get back the containers it fits in, how full each one is, what did not fit, and a link to an interactive 3D load plan.

Backed by the 3DPACK.ING solver — the same one behind the web planner. Asked "will 500 cartons fit in a 40-foot", an assistant without this will do arithmetic on volumes, which ignores stacking rules, orientation and weight limits and overstates what fits by a wide margin on real cargo.

Install

Hosted (no install)

The server runs at https://3dpack.ing/mcp over streamable HTTP. Nothing to install, and it answers on the first call without an account.

Claude Code:

claude mcp add --transport http 3dpacking https://3dpack.ing/mcp

Any client that takes a URL — add https://3dpack.ing/mcp. To use your own key instead of the shared demo account, pass it in the query string:

https://3dpack.ing/mcp?apiKey=your-key&username=your-username

or send X-3dpacking-Api-Key and X-3dpacking-Username headers, if you would rather not put a key in a URL. Both are needed together — the API rejects a key without the account it belongs to.

Local (npm)

Claude Desktop — add to claude_desktop_config.json:

{
  "mcpServers": {
    "3dpacking": {
      "command": "npx",
      "args": ["-y", "@3dpacking/mcp-server"]
    }
  }
}

Claude Code:

claude mcp add 3dpacking -- npx -y @3dpacking/mcp-server

It works immediately, with no account — the first call runs against a shared demo account on the free plan. For your own limits, sign up at https://3dpack.ing/login and add:

{
  "mcpServers": {
    "3dpacking": {
      "command": "npx",
      "args": ["-y", "@3dpacking/mcp-server"],
      "env": {
        "THREEDPACKING_API_KEY": "your-key",
        "THREEDPACKING_USERNAME": "your-username"
      }
    }
  }
}

Both must be set together — the API rejects a key without a username.

The tool

pack_shipment — one required argument, prompt, describing the cargo in plain English, and two optional settings: a speed of fast, normal or thorough, and a stability of 75 to 100.

stability is how much of a box must rest on what is underneath it, as a percentage of its own footprint. Omit it for 75, the standard rule, which lets a quarter of a box overhang and packs the most. Raise it for cargo that must not lean — drums, glass, anything top-heavy — and use 100 when every stacked box has to sit fully supported. It is the one constraint the prompt cannot carry, because it governs how the solver stacks rather than what is being shipped, and a higher value fits fewer items.

Things it understands:

Pack 50 boxes of 60x40x30 cm into a 20ft container
Load 100 fragile items 80x60x40cm, max stack 3, into a 40ft high cube
Ship mixed pallets: 10x euro pallets, 15x US pallets, best container mix
Ship 24 pcs 200.3x120.2x100.2 cm (non-tiltable), optimal mix of 40ft and 20ft

What comes back:

Everything fits: 1 container.

Container 1 (589.3 x 235 x 239 cm internal)
  items: 50
  of which: 50x Boxes
  used: volume 10.9%
  5 empty gaps left

Interactive 3D load plan: https://3dpack.ing/app?g=6c4b9488-...

Notes on the shaping

The API returns the geometry of every unfilled cuboid in every container, with coordinates. That is what the 3D viewer needs and it is most of the payload on a real shipment. Spending a model's context on the coordinates of empty space, when the link opens a picture of exactly that, is a poor trade — so the summary keeps the count of gaps and drops the geometry. On a small pack that is 791 bytes down to 341; on a large one it is the difference between a usable answer and a flooded context.

A plan limit is not reported as an error. The API returns HTTP 500 for NotSubscribed, the same status it uses for a solver crash; left alone, an assistant reads that as "the service is broken" and tells the user to try again later, when what actually happened is that they asked for a Pro feature. This server sorts the two apart and relays the offer.

Anything that answers with non-JSON — a proxy, a VPN, a corporate egress allowlist — is reported as a network problem naming what actually replied, rather than as a packing failure. Only one of those is something the user can fix.

Environment

Development

npm install
npm run smoke     # calls the live solver with demo credentials and checks the shape

smoke.js is deliberately not mocked for the live checks. The thing that will break this package is 3dpack.ing changing the shape of its answer, and no amount of mocking catches that. Run it before publishing. To exercise the success path without spending a calculation, point THREEDPACKING_ENDPOINT at a stub.

Licence

MIT.