Drawing Converter MCP Server

Convert technical drawings (PDF) and engineering callouts between metric and imperial — from any MCP-enabled AI assistant.

This Model Context Protocol server exposes the conversion engine behind metric-to-imperial-converter.imnoo.com (by Imnoo): shop-floor-precision unit conversion for dimensions, ± tolerances, ISO fit classes, threads, surface roughness and weights — including producing a converted copy of a drawing PDF with every value stamped in place.

"Convert bracket.pdf to imperial and tell me what replaces the M8 thread"
        │
        ▼  (your AI assistant calls the tools)
extract_drawing_text ──► classify values ──► convert_drawing_pdf
                                                   │
                                                   ▼
                                    bracket.imperial.pdf  ✓ Ø30 H7 → Ø1.1811 H7
                                                          ✓ M8     → 5/16-18 UNC

Tools

Plus a convert-drawing prompt that walks the assistant through extract → classify → convert.

The AI-analysis step stays with your assistant. extract_drawing_text hands the model every printed token with its position; the model decides which tokens are real values (and whether a bare 3.2 is a length or an Ra roughness) and passes that as classifications to convert_drawing_pdf. No API keys, no cloud calls — the server itself is fully deterministic and offline.

Installation

Requires Node.js ≥ 18.

Claude Code

claude mcp add drawing-converter -- npx -y drawing-converter-mcp

Claude Desktop

Add to claude_desktop_config.json (Settings → Developer → Edit Config):

{
  "mcpServers": {
    "drawing-converter": {
      "command": "npx",
      "args": ["-y", "drawing-converter-mcp"]
    }
  }
}

Cursor

Add to Cursor — or add to ~/.cursor/mcp.json:

{
  "mcpServers": {
    "drawing-converter": {
      "command": "npx",
      "args": ["-y", "drawing-converter-mcp"]
    }
  }
}

VS Code (GitHub Copilot)

code --add-mcp '{"name":"drawing-converter","command":"npx","args":["-y","drawing-converter-mcp"]}'

Windsurf / other stdio clients

Any client that launches stdio servers works with:

npx -y drawing-converter-mcp

Example session

You: Convert C:\drawings\flange.pdf to imperial.

Assistant: calls extract_drawing_text — 63 tokens, source system: metric (high confidence — "mm", ISO 2768). classifies tokens, skips the title block, marks 1.6 next to the surface symbol as roughness, calls convert_drawing_pdf — wrote `C:\drawi

... View full README on GitHub