Fusion 360 API MCP Server

A comprehensive Model Context Protocol (MCP) server that provides full access to the Autodesk Fusion 360 Python API documentation, code generation, and API querying capabilities with automatic index updates.

Features

This MCP server provides 9 powerful tools for working with the Fusion 360 API:

Documentation Tools

• search_fusion_docs - Search official Fusion 360 documentation on help.autodesk.com
• fetch_fusion_doc - Fetch complete documentation page content

API Reference Tools

• query_api - Search local API index for classes, methods, and properties
• get_class_info - Get detailed information about specific API classes
• list_api_namespaces - Browse available API namespaces (adsk.core, adsk.fusion, adsk.cam)

Code Generation Tools

• generate_addin - Generate complete Fusion 360 add-in templates with event handlers
• generate_script - Generate standalone script templates

Auto-Update Tools (NEW!)

• update_api_index - Automatically scrape and index API documentation from help.autodesk.com
• get_index_status - Check index status, last update time, and statistics

Installation

1. Clone or Download This Repository

cd /path/to/your/projects
git clone <your-repo-url> fusion-mcp-docs
cd fusion-mcp-docs

2. Install Python Dependencies

# Create and activate virtual environment (recommended)
python3 -m venv .venv
source .venv/bin/activate  # On Windows: .venv\Scripts\activate

# Install dependencies
pip install -r requirements.txt

3. Build API Index (Two Options)

Option A: Auto-Update (Recommended - NEW!)

Simply use the MCP tool after configuring your client:

Use update_api_index with max_classes: 20  (test first)
Use update_api_index                       (full update, 15-20 mins)

This will automatically:

• Discover all API classes from help.autodesk.com
• Download and parse documentation
• Cache results for 7 days
• Build the complete API index

See AUTO_UPDATE_GUIDE.md for details!

Option B: Manual Build (Legacy)

Download offline docs and run build_index.py:

# 1. Download Fusion 360 API offline documentation from Autodesk
# 2. Extract it to a directory (e.g., /path/to/fusion-api-offline)
# 3. Update BASE_DIR in build_index.py to point to your extracted docs
# 4. Run the index builder:
python build_index.py

Note: Documentation search and code generation work without any index!

4. Configure MCP Client

For Claude Desktop (Mac/Linux)

Edit ~/Library/Application Support/Claude/claude_desktop_config.json (Mac) or ~/.config/Claude/claude_desktop_config.json (Linux):

{
  "mcpServers": {
    "fusion360-api": {
      "command": "python3",
      "args": ["/absolute/path/to/fusion-mcp-docs/server.py"],
      "env": {}
    }
  }
}

For Cline (VS Code Extension)

The MCP server configuration is typically stored at:

• Windows: %appdata%\Code\User\globalStorage\saoudrizwan.claude-dev\settings\cline_mcp_settings.json
• Mac: ~/Library/Application Support/Code/User/globalStorage/saoudrizwan.claude-dev/settings/cline_mcp_settings.json
• Linux: ~/.config/Code/User/globalStorage/saoudrizwan.claude-dev/settings/cline_mcp_settings.json

Add this configuration:

{
  "mcpServers": {
    "fusion360-api": {
      "command": "python3",
      "args": ["/absolute/path/to/fusion-mcp-docs/server.py"],
      "disabled": false,
      "autoApprove": []
    }
  }
}

Important: Replace /absolute/path/to/fusion-mcp-docs/ with the actual absolute path to this directory!

5. Restart Your MCP Client

• Claude Desktop: Quit and restart the application
• Cline: Reload VS Code window

Usage Examples

Once configured, you can use these tools through your MCP client:

Search for API Documentation

Use search_fusion_docs to find information about "BRepBody class"

Generate an Add-in

Use generate_addin to create a new add-in called "Part Exporter" that exports selected parts to STEP format

Query API Structure

Use query_api to find all classes related to "sketch"

Get Class Details

Use get_class_info for "adsk.fusion.ExtrudeFeature"

Architecture

MCP Tools Overview

Tool	Purpose	Requires Index
search_fusion_docs	Search online docs	No
fetch_fusion_doc	Fetch doc pages	No
query_api	Search API index	Yes
get_class_info	Get class details	Yes
list_api_namespaces	List API structure	Yes
generate_addin	Create add-in template	No
generate_script	Create script template	No

Files

• server.py - Main MCP server implementation
• build_index.py - Builds searchable API index from offline docs
• fusion_api_index.json - Generated API index (created by build_index.py)
• requirements.txt - Python dependencies
• setup_mcp.py - Helper script for automatic configuration (legacy)

Building the API Index

The API index enables powerful local querying of the Fusion 360 API without needing internet access. Here's how to set it up:

1. Get Offline Documentation

1. Open Fusion 360
2. Go to Help → API Documentation
3. Download the offline documentation package
4. Extract it to a directory on your computer

2. Configure build_index.py

Edit build_index.py and update the BASE_DIR variable (line 12):

BASE_DIR = Path("/path/to/your/extracted/fusion-api-docs")

You may also need to adjust FILES_ROOT_GLOB (line 15) depending on your documentation structure:

FILES_ROOT_GLOB = "**/Fusion-360-API/files/*.htm"

3. Run the Index Builder

python build_index.py

This will:

• Scan all HTML files in the documentation
• Extract class names, methods, properties, events
• Build a searchable JSON index
• Save it as fusion_api_index.json

The process may take a few minutes depending on the documentation size.

Troubleshooting

Server Won't Start

1. Check Python version: python3 --version (requires 3.10+)
2. Verify dependencies: pip install -r requirements.txt
3. Check file permissions: chmod +x server.py
4. Test manually: python3 server.py (should wait for input)

Tools Not Appearing

1. Verify absolute path in MCP configuration
2. Check MCP client logs for errors
3. Restart your MCP client completely
4. Try manually testing: echo '{"jsonrpc":"2.0","method":"tools/list","id":1}' | python3 server.py

API Index Tools Not Working

1. Make sure fusion_api_index.json exists
2. Check it's not empty: cat fusion_api_index.json
3. Rebuild the index: python build_index.py
4. Verify BASE_DIR points to correct documentation location

Documentation Search Returns No Results

• DuckDuckGo may be rate-limiting requests
• Try again after a few minutes
• Check internet connection
• Verify help.autodesk.com is accessible

Development

Project Structure

fusion-mcp-docs/
├── server.py              # Main MCP server
├── build_index.py         # API index builder
├── fusion_api_index.json  # Generated API index
├── requirements.txt       # Python dependencies
├── setup_mcp.py          # Legacy setup helper
└── README.md             # This file

Adding New Tools

To add a new tool to the MCP server:

1. Add tool definition in list_tools() function
2. Implement handler logic in call_tool() function
3. Add helper functions as needed
4. Update this README

Testing

Test the server manually:

# Start server in debug mode
python3 server.py

# Send a test request (in another terminal)
echo '{"jsonrpc":"2.0","method":"tools/list","id":1}' | python3 server.py

Resources

• Model Context Protocol Documentation
• Fusion 360 API Reference
• MCP Python SDK
• Fusion 360 API Samples

License

This is an unofficial community project and is not affiliated with or endorsed by Autodesk.

Contributing

Contributions welcome! Please:

1. Fork the repository
2. Create a feature branch
3. Make your changes
4. Submit a pull request

Support

For issues or questions:

• Check the Troubleshooting section above
• Review MCP server logs in your client
• Open an issue on GitHub

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Made for Fusion 360 developers who want AI-assisted API access