Hammer MCP

Hammer MCP is a standalone Model Context Protocol server for generating CAD files. It exposes DXF and OpenSCAD operations to MCP clients and contains no interactive user CLI.

Capabilities

• DXF drafting, saving, and PNG previews.

• OpenSCAD primitives, extrusion, Boolean operations, PNG rendering, and STL/3MF/OFF export.

• Local Ollama planning for multi-step natural-language requests.

• Guarded scripting with audit logging.

Related MCP server: 3D MCP Server

Install and run

python -m pip install -e ".[dev]"
hammer-cad-mcp

For an uninstalled checkout:

$env:PYTHONPATH = "src"
python -m hammer_cad_mcp.server

The server uses MCP stdio transport and waits silently when started directly.

MCP client configuration

{
  "mcpServers": {
    "hammer-cad": {
      "command": "python",
      "args": ["-m", "hammer_cad_mcp.server"],
      "cwd": "C:\\path\\to\\HammerMCP",
      "env": {
        "PYTHONPATH": "C:\\path\\to\\HammerMCP\\src"
      }
    }
  }
}

Natural-language planning defaults to local llama3:latest through Ollama. Change the model or URL in config/config.json.

Test

python -m pytest -q
python scripts\mcp_smoke_test.py

Generated files are written to output/.