mixelpixx/KiCAD-MCP-Server

KiCAD MCP Server

A production-ready Model Context Protocol (MCP) server that enables AI assistants like Claude to interact with KiCAD for PCB design automation. Built on the MCP 2025-06-18 specification, this server provides comprehensive tool schemas and real-time project state access for intelligent PCB design workflows.

Overview

The Model Context Protocol is an open standard from Anthropic that allows AI assistants to securely connect to external tools and data sources. This implementation provides a standardized bridge between AI assistants and KiCAD, enabling natural language control of professional PCB design operations.

Key Capabilities:

• 52 fully-documented tools with JSON Schema validation
• 8 dynamic resources exposing project state
• Full MCP 2025-06-18 protocol compliance
• Cross-platform support (Linux, Windows, macOS)
• Real-time KiCAD UI integration
• Comprehensive error handling and logging

What's New in v2.1.0

Comprehensive Tool Schemas

Every tool now includes complete JSON Schema definitions with:

• Detailed parameter descriptions and constraints
• Input validation with type checking
• Required vs. optional parameter specifications
• Enumerated values for categorical inputs
• Clear documentation of what each tool does

Resources Capability

Access project state without executing tools:

• kicad://project/current/info - Project metadata
• kicad://project/current/board - Board properties
• kicad://project/current/components - Component list (JSON)
• kicad://project/current/nets - Electrical nets
• kicad://project/current/layers - Layer stack configuration
• kicad://project/current/design-rules - Current DRC settings
• kicad://project/current/drc-report - Design rule violations
• kicad://board/preview.png - Board visualization (PNG)

Protocol Compliance

• Updated to MCP SDK 1.21.0 (latest)
• Full JSON-RPC 2.0 support
• Proper capability negotiation
• Standards-compliant error codes

Available Tools

The server provides 52 tools organized into functional categories:

Project Management (4 tools)

• create_project - Initialize new KiCAD projects
• open_project - Load existing project files
• save_project - Save current project state
• get_project_info - Retrieve project metadata

Board Operations (9 tools)

• set_board_size - Configure PCB dimensions
• add_board_outline - Create board edge (rectangle, circle, polygon)
• add_layer - Add custom layers to stack
• set_active_layer - Switch working layer
• get_layer_list - List all board layers
• get_board_info - Retrieve board properties
• get_board_2d_view - Generate board preview image
• add_mounting_hole - Place mounting holes
• add_board_text - Add text annotations

Component Placement (10 tools)

• place_component - Place single component with footprint
• move_component - Reposition existing component
• rotate_component - Rotate component by angle
• delete_component - Remove component from board
• edit_component - Modify component properties
• get_component_properties - Query component details
• get_component_list - List all placed components
• place_component_array - Create component grids/patterns
• align_components - Align multiple components
• duplicate_component - Copy existing component

Routing & Nets (8 tools)

• add_net - Create electrical net
• route_trace - Route copper traces
• add_via - Place vias for layer transitions
• delete_trace - Remove traces
• get_nets_list - List all nets
• create_netclass - Define net class with rules
• add_copper_pour - Create copper zones/pours
• route_differential_pair - Route differential signals

Library Management (4 tools)

• list_libraries - List available footprint libraries
• search_footprints - Search for footprints
• list_library_footprints - List footprints in library
• get_footprint_info - Get footprint details

Design Rules (4 tools)

• set_design_rules - Configure DRC parameters
• get_design_rules - Retrieve current rules
• run_drc - Execute design rule check
• get_drc_violations - Get DRC error report

Export (5 tools)

• export_gerber - Generate Gerber fabrication files
• export_pdf - Export PDF documentation
• export_svg - Create SVG vector graphics
• export_3d - Generate 3D models (STEP/VRML)
• export_bom - Produce bill of materials

Schematic Design (6 tools)

• create_schematic - Initialize new schematic
• load_schematic - Open existing schematic
• add_schematic_component - Place symbols
• add_schematic_wire - Connect component pins
• list_schematic_libraries - List symbol libraries
• export_schematic_pdf - Export schematic PDF

UI Management (2 tools)

• check_kicad_ui - Check if KiCAD is running
• launch_kicad_ui - Launch KiCAD application

Prerequisites

Required Software

KiCAD 9.0 or Higher

• Download from kicad.org/download
• Must include Python module (pcbnew)
• Verify installation:

  python3 -c "import pcbnew; print(pcbnew.GetBuildVersion())"
  

Node.js 18 or Higher

• Download from nodejs.org
• Verify: node --version and npm --version

Python 3.10 or Higher

• Usually included with KiCAD
• Required packages (auto-installed):
  • kicad-skip >= 0.1.0 (schematic support)
  • Pillow >= 9.0.0 (image processing)
  • cairosvg >= 2.7.0 (SVG rendering)
  • colorlog >= 6.7.0 (logging)
  • pydantic >= 2.5.0 (validation)
  • requests >= 2.32.5 (HTTP client)
  • python-dotenv >= 1.0.0 (environment)

MCP Client Choose one:

• Claude Desktop - Official Anthropic desktop app
• Claude Code - Official CLI tool
• Cline - VSCode extension

Supported Platforms

• Linux (Ubuntu 22.04+, Fedora, Arch) - Primary platform, fully tested
• Windows 10/11 - Fully supported with automated setup
• macOS - Experimental support

Installation

Linux (Ubuntu/Debian)

# Install KiCAD 9.0
sudo add-apt-repository --yes ppa:kicad/kicad-9.0-releases
sudo apt-get update
sudo apt-get install -y kicad kicad-libraries

# Install Node.js
curl -fsSL https://deb.nodesource.com/setup_20.x | sudo -E bash -
sudo apt-get install -y nodejs

# Clone and build
git clone https://github.com/mixelpixx/KiCAD-MCP-Server.git
cd KiCAD-MCP-Server
npm install
pip3 install -r requirements.txt
npm run build

# Verify
python3 -c "import pcbnew; print(pcbnew.GetBuildVersion())"

Windows 10/11

Automated Setup (Recommended):

git clone https://github.com/mixelpixx/KiCAD-MCP-Server.git
cd KiCAD-MCP-Server
.\setup-windows.ps1

The script will:

• Detect KiCAD installation
• Verify prerequisites
• Install dependencies
• Build project
• Generate configuration
• Run diagnostics

Manual Setup: See for detailed instructions.

macOS

# Install KiCAD 9.0 from kicad.org/download/macos

# Install Node.js
brew install node@20

# Clone and build
git clone https://github.com/mixelpixx/KiCAD-MCP-Server.git
cd KiCAD-MCP-Server
npm install
pip3 install -r requirements.txt
npm run build

Configuration

Claude Desktop

Edit configuration file:

• Linux/macOS: ~/.config/Claude/claude_desktop_config.json
• Windows: %APPDATA%\Claude\claude_desktop_config.json

Configuration:

{
  "mcpServers": {
    "kicad": {
      "command": "node",
      "args": ["/path/to/KiCAD-MCP-Server/dist/index.js"],
      "env": {
        "PYTHONPATH": "/path/to/kicad/python",
        "LOG_LEVEL": "info"
      }
    }
  }
}

Platform-specific PYTHONPATH:

• Linux: /usr/lib/kicad/lib/python3/dist-packages
• Windows: C:\Program Files\KiCad\9.0\lib\python3\dist-packages
• macOS: /Applications/KiCad/KiCad.app/Contents/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages

Cline (VSCode)

Edit: ~/.config/Code/User/globalStorage/saoudrizwan.claude-dev/settings/cline_mcp_settings.json

Use the same configuration format as Claude Desktop above.

Claude Code

Claude Code automatically detects MCP servers in the current directory. No additional configuration needed.

Usage Examples

Basic PCB Design Workflow

Create a new KiCAD project named 'LEDBoard' in my Documents folder.
Set the board size to 50mm x 50mm and add a rectangular outline.
Place a mounting hole at each corner, 3mm from the edges, with 3mm diameter.
Add text 'LED Controller v1.0' on the front silkscreen at position x=25mm, y=45mm.

Component Placement

Place an LED at x=10mm, y=10mm using footprint LED_SMD:LED_0805_2012Metric.
Create a grid of 4 resistors (R1-R4) starting at x=20mm, y=20mm with 5mm spacing.
Align all resistors horizontally and distribute them evenly.

Routing

Create a net named 'LED1' and route a 0.3mm trace from R1 pad 2 to LED1 anode.
Add a copper pour for GND on the bottom layer covering the entire board.
Create a differential pair for USB_P and USB_N with 0.2mm width and 0.15mm gap.

Design Verification

Set design rules with 0.15mm clearance and 0.2mm minimum track width.
Run a design rule check and show me any violations.
Export Gerber files to the 'fabrication' folder.

Using Resources

Resources provide read-only access to project state:

Show me the current component list.
What are the current design rules?
Display the board preview.
List all electrical nets.

Architecture

MCP Protocol Layer

• JSON-RPC 2.0 Transport: Bi-directional communication via STDIO
• Protocol Version: MCP 2025-06-18
• Capabilities: Tools (52), Resources (8)
• Error Handling: Standard JSON-RPC error codes

TypeScript Server (src/)

• Implements MCP protocol specification
• Manages Python subprocess lifecycle
• Handles message routing and validation
• Provides logging and error recovery

Python Interface (python/)

• kicad_interface.py: Main entry point, MCP message handler
• schemas/tool_schemas.py: JSON Schema definitions for all tools
• resources/resource_definitions.py: Resource handlers and URIs
• commands/: Modular command implementations
  • project.py - Project operations
  • board.py - Board manipulation
  • component.py - Component placement
  • routing.py - Trace routing and nets
  • design_rules.py - DRC operations
  • export.py - File generation
  • schematic.py - Schematic design
  • library.py - Footprint libraries

KiCAD Integration

• pcbnew API: Direct Python bindings to KiCAD
• kicad-skip: Schematic file manipulation
• Platform Detection: Cross-platform path handling
• UI Management: Automatic KiCAD UI launch/detection

Development

Building from Source

# Install dependencies
npm install
pip3 install -r requirements.txt

# Build TypeScript
npm run build

# Watch mode for development
npm run dev

Running Tests

# TypeScript tests
npm run test:ts

# Python tests
npm run test:py

# All tests with coverage
npm run test:coverage

Linting and Formatting

# Lint TypeScript and Python
npm run lint

# Format code
npm run format

Troubleshooting

Server Not Appearing in Client

Symptoms: MCP server doesn't show up in Claude Desktop or Cline

Solutions:

1. Verify build completed: ls dist/index.js
2. Check configuration paths are absolute
3. Restart MCP client completely
4. Check client logs for error messages

Python Module Import Errors

Symptoms: ModuleNotFoundError: No module named 'pcbnew'

Solutions:

1. Verify KiCAD installation: python3 -c "import pcbnew"
2. Check PYTHONPATH in configuration matches your KiCAD installation
3. Ensure KiCAD was installed with Python support

Tool Execution Failures

Symptoms: Tools fail with unclear errors

Solutions:

1. Check server logs: ~/.kicad-mcp/logs/kicad_interface.log
2. Verify a project is loaded before running board operations
3. Ensure file paths are absolute, not relative
4. Check tool parameter types match schema requirements

Windows-Specific Issues

Symptoms: Server fails to start on Windows

Solutions:

1. Run automated diagnostics: .\setup-windows.ps1
2. Verify Python path uses double backslashes: C:\\Program Files\\KiCad\\9.0
3. Check Windows Event Viewer for Node.js errors
4. See

Getting Help

1. Check the GitHub Issues
2. Review server logs: ~/.kicad-mcp/logs/kicad_interface.log
3. Open a new issue with:
   • Operating system and version
   • KiCAD version (python3 -c "import pcbnew; print(pcbnew.GetBuildVersion())")
   • Node.js version (node --version)
   • Full error message and stack trace
   • Relevant log excerpts

Project Status

Current Version: 2.1.0-alpha

Production-Ready Features:

• Project creation and management
• Board outline and sizing
• Layer management
• Component placement (with library integration needed)
• Mounting holes and text annotations
• Design rule checking
• Export to Gerber, PDF, SVG, 3D
• Schematic creation and editing
• UI auto-launch
• Full MCP protocol compliance

In Development:

• JLCPCB parts integration
• Digikey API integration
• Advanced routing algorithms
• Real-time UI synchronization via IPC API
• Smart BOM management

Roadmap:

• AI-assisted component selection
• Design pattern library (Arduino shields, RPi HATs)
• Interactive design review mode
• Automated documentation generation
• Multi-board projects

See for detailed development timeline.

Contributing

Contributions are welcome! Please follow these guidelines:

1. Report Bugs: Open an issue with reproduction steps
2. Suggest Features: Describe use case and expected behavior
3. Submit Pull Requests:
   • Fork the repository
   • Create a feature branch
   • Follow existing code style
   • Add tests for new functionality
   • Update documentation
   • Submit PR with clear description

See for detailed guidelines.

License

This project is licensed under the MIT License. See for details.

Acknowledgments

• Built on the Model Context Protocol by Anthropic
• Powered by KiCAD open-source PCB design software
• Uses kicad-skip for schematic manipulation

Citation

If you use this project in your research or publication, please cite:

@software{kicad_mcp_server,
  title = {KiCAD MCP Server: AI-Assisted PCB Design},
  author = {mixelpixx},
  year = {2025},
  url = {https://github.com/mixelpixx/KiCAD-MCP-Server},
  version = {2.1.0-alpha}
}