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PartCAD

PartCAD is an MCP server that adds developer tools to AI assistants such as Claude Desktop, Claude Code and Cursor. Inspect, render, test and export the parts and assemblies of PartCAD hardware packages. It has 509 GitHub stars, is released under the Apache-2.0 license and runs locally with uvx partcad.

github.com/partcad/partcad (opens in a new tab)

Data as of from the GitHub API and the official MCP registry; description from the project's repository. Report an error

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Install PartCAD

Generated from the server's MCP registry entry. Replace your-value with your own values.

Claude Desktop

claude_desktop_config.json
{
  "mcpServers": {
    "partcad": {
      "command": "uvx",
      "args": [
        "partcad"
      ],
      "env": {
        "PC_PATH": "your-value"
      }
    }
  }
}

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

Claude Code

claude mcp add --env PC_PATH=your-value --transport stdio partcad -- uvx partcad

Cursor

.cursor/mcp.json
{
  "mcpServers": {
    "partcad": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "partcad"
      ],
      "env": {
        "PC_PATH": "your-value"
      }
    }
  }
}

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

VS Code

.vscode/mcp.json
{
  "servers": {
    "partcad": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "partcad"
      ],
      "env": {
        "PC_PATH": "your-value"
      }
    }
  }
}

Config formats checked against the official docs on Oct 7, 2026: modelcontextprotocol.io (opens in a new tab), code.claude.com (opens in a new tab), cursor.com (opens in a new tab), code.visualstudio.com (opens in a new tab).

Environment variables

Variables the server reads at startup.

NameRequiredDescription
PC_PATHNoThe PartCAD package to serve: a directory with a partcad.yaml, or the file. The working directory when unset.

About PartCAD

[PartCAD] is the programming language for manufacturable things. A package is a Git repository with a partcad.yaml that declares parts (CAD scripts or files), assemblies, materials and requirements. PartCAD renders, tests, simulates, analyses and documents them, and produces the bill of materials, the sourcing and the assembly instructions from that same source. Everything is text, so it is versioned, reviewed and generated like software, by people and by AI agents.

  • build123d
  • cadquery
  • mechanical-design
  • mechanical-engineering
  • 3d
  • modelling
  • python
  • 3d-models
  • openscad
  • manufacturability

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FAQ

PartCAD FAQ

Still curious? Email info@appsgit.com.

How do I install the PartCAD MCP server?

Add the command uvx partcad to your MCP client: put it in claude_desktop_config.json for Claude Desktop, run claude mcp add for Claude Code, or add it to .cursor/mcp.json (Cursor) or .vscode/mcp.json (VS Code). The snippets on this page are ready to paste.

Is PartCAD free?

The server is open source under the Apache-2.0 license, so running it is free. It does not declare any required API key.

Is PartCAD actively maintained?

The most recent commit was on Oct 26, 2026. The latest release is 0.8.235, published Oct 24, 2026. appsgit only lists MCP servers with a commit in the last six months.