Ottogeo — CAD MCP Server

Name: Ottogeo — CAD MCP Server
Author: ottonic

by ottonicversion 0.10.1i★ –iRuns on your computer

Registry nameio.github.ottonic/cad-mcp-server

Install

Overview

Description from the maker (original English)

Measure STEP CAD files with your AI assistant: walls, clearances, draft, and revision diffs.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Other

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
The registry lists no key to fill in.

You need

npmNode.js installed (for the npx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "cad": {
      "command": "npx",
      "args": [
        "-y",
        "cad-mcp-server"
      ]
    }
  }
}

Run this in your terminal

claude mcp add cad -- npx -y cad-mcp-server

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "cad": {
      "command": "npx",
      "args": [
        "-y",
        "cad-mcp-server"
      ]
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "cad": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "cad-mcp-server"
      ]
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 7, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account ottonic, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Otheri

More stars than 0% of the other 32700 servers in this category
Published to the registry more recently than 83% of the other 32700 servers in this category
Basic checks equal to or better than 100% of the other 32700 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Ottogeo — CAD MCP Server safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (0.10.1) reached the registry 7 days ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: Spec Driven Development, Remote Desktop Commander, Agent Data Tools: Utilities

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README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

Ottogeo — CAD MCP Server

Give any AI assistant the ability to measure real CAD geometry. The server opens STEP files with the Open CASCADE kernel and answers the questions an engineer actually asks — overall size and volume, hole and boss diameters, wall thickness, clearance, draft, cross-sections, and what changed between two revisions — with numbers computed from the model's own B-rep, not estimated from a screenshot.

Quick start

Add the server to your MCP client, then point your assistant at a STEP file:

"mcpServers": { "cad": { "command": "npx", "args": ["-y", "cad-mcp-server"] } } }

Works with any MCP client — Claude Desktop, Cursor, VS Code, and the rest.

Ask it anything about a part

"What are the overall dimensions and volume of this part?"
"Find the cylindrical faces and list their diameters and axes."
"Measure wall thickness on these faces."
"What is the minimum distance between this hole and the nearest wall?"
"Measure draft relative to the +Z direction and list faces with negative draft."
"Cut a section through this body at X = 40."
"What changed between revision A and revision B?"

More examples, including DFM-style review prompts, are in docs/EXAMPLE_PROMPTS.md.

Tools

Tool	Returns
`inspect`	Bounding-box dimensions, volume, surface area, body and assembly structure, B-rep health, and a revision-bound reference.
`find_entities`	Faces, edges, vertices, and bodies, with filters for surface type, radius, axis, and area.
`measure`	Distance between faces, wall thickness, draft, ray casts, ray grids, point analysis, planar sections, and edge continuity.
`describe_pmi`	Declared dimensions (nominal with deviations or bounds), geometric tolerances (value, zone, material modifier, datums), and datums, each with the entity IDs it applies to.
`diff`	Dimension, volume, area, and topology deltas between two STEP revisions, declared PMI counts, and parsed STEP metadata.

Measurement kinds are distance, thickness, draft, ray, ray_grid, point_analysis, section, and continuity. Lengths come back in the file's declared unit, labelled on every result, so an inch model stays in inches and nothing has to be converted by hand. Angles are in degrees.

Why the numbers hold up

Computed by Open CASCADE, not guessed. The same file and the same query return the same numbers, every time.
Revision-bound and self-verifying. Every result carries the entity IDs and the SHA-256 revision it came from, and stale IDs are rejected when a file changes underneath a session — so an answer can never be attached to the wrong geometry.
Reads the model's own callouts. describe_pmi reports the dimensions, geometric tolerances, and datums a file declares, each bound to the entities it applies to, so declared requirements can be checked against the geometry.
Local and private. It runs over stdio and reads files by path. It is read-only and never uploads or writes your CAD data.

Requirements

Node.js 26+
Windows x64, macOS ARM64 (Apple Silicon), or Linux x64
STEP files, as exported by SolidWorks, Fusion 360, Onshape, FreeCAD, CATIA, or any other CAD system

FAQ

Does it need CAD software installed? No. It reads STEP files directly, so it works on a machine without a CAD application or license.

Do my files leave my machine? No. The server runs locally over stdio and reads files by path. It is read-only and never writes to your CAD data.

How is this different from asking an assistant to look at a screenshot? Measurements are computed from the model's B-rep geometry by Open CASCADE, so the same file and query return the same numbers. Each result also carries the entity IDs and revision it came from.

Development

Source setup, checks, packaging, and releases are in docs/DEVELOPMENT.md. The server targets Windows x64, macOS ARM64, and Linux x64, and builds its native sidecar from the pinned OCCT revision.

Packaging

npm pack builds first and includes the compiled server, the native sidecar, this README, and the third-party notices. Tests and source maps are excluded. Install the tarball to check the cad-mcp-server executable with a compatible MCP client.

Documentation

Example prompts
Architecture — tools, workflow, and limits
Security — local processing and handling CAD files as sensitive input
Changelog

License

MIT. Third-party licenses: THIRD_PARTY_NOTICES.md.

Ottogeo — CAD MCP Server

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Otheri

Common questions

Alternatives

Spec Driven Development

Remote Desktop Commander

Agent Data Tools: Utilities

README from the maker

Ottogeo — CAD MCP Server

Quick start

Ask it anything about a part

Tools

Why the numbers hold up

Requirements

FAQ

Development

Packaging

Documentation

License