# Bitbybit CAD MCP (MCP server)

> Bitbybit CAD MCP is an MCP server that adds developer tools to AI assistants such as Claude Desktop, Claude Code and Cursor. Bitbybit 3D parametric CAD API, version-exact, for coding agents: search, describe, examples, guide. It has 203 GitHub stars, is released under the MIT license and runs locally with npx -y @bitbybit-dev/mcp.

An MCP server that documents the Bitbybit 3D CAD API for AI coding agents: every function, its parameters, defaults, return type and examples, for the exact version your project uses. Bitbybit has 1919 functions across three CAD kernels - more than any model holds in memory - so an agent working from memory invents plausible names that do not exist. An agent with this server looks each one up instead, and writes code that compiles the first time.

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/bitbybit-dev/bitbybit |
| GitHub stars | 203 |
| License | MIT |
| Language | TypeScript |
| Transport | stdio, streamable-http |
| Packages | npm: @bitbybit-dev/mcp |
| Remote URL | https://mcp.bitbybit.dev/mcp |
| Needs API key | no |
| Official | yes |
| Works with | Claude Desktop, Claude Code, Cursor, VS Code, Claude.ai, ChatGPT |
| Category | Developer tools |
| Latest release | v1.4.1 (Oct 2, 2026) |
| Last commit | Oct 2, 2026 |
| MCP registry name | dev.bitbybit/cad |

## Install

### Claude Desktop (claude_desktop_config.json)

```json
{
  "mcpServers": {
    "bitbybit-cad-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@bitbybit-dev/mcp"
      ]
    }
  }
}
```

Settings > Developer > Edit Config. macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\. Restart Claude Desktop afterwards.

### Claude Code

```sh
claude mcp add --transport stdio bitbybit-cad-mcp -- npx -y @bitbybit-dev/mcp
```

### Cursor (.cursor/mcp.json)

```json
{
  "mcpServers": {
    "bitbybit-cad-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@bitbybit-dev/mcp"
      ]
    }
  }
}
```

Project file; use ~/.cursor/mcp.json to enable it in every project.

### VS Code (.vscode/mcp.json)

```json
{
  "servers": {
    "bitbybit-cad-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@bitbybit-dev/mcp"
      ]
    }
  }
}
```

### Claude Code (remote)

```sh
claude mcp add --transport http bitbybit-cad-mcp "https://mcp.bitbybit.dev/mcp"
```

The same server is also hosted as a remote MCP endpoint, so nothing runs on your machine.

Config formats checked against the official docs on 2026-10-07.

## Tools

- `search_api`: members by keywords, with path, summary, tier and engines
- `describe`: the full contract of one member by dotted path; an unknown path is reported with the nearest existing ones
- `list_namespace`: the members one level below a namespace
- `get_examples`: code examples for a member, a namespace or a topic
- `get_guide`: sections of the public guide on where geometry should run

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---

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