Fusion

Open-source MCP server for controlling Autodesk Fusion 360 from any AI agent. just Python.

MCP Client ──stdio──▶ MCP Server (Python) ──TCP──▶ Fusion 360 Add-in ──▶ Fusion API

Setup

1. Clone and install

With uv (recommended):

git clone https://github.com/prim-design/fusion-mcp.git
cd fusion-mcp
uv pip install -e .

With pip (macOS/Linux):

git clone https://github.com/prim-design/fusion-mcp.git
cd fusion-mcp
python3 -m venv .venv
source .venv/bin/activate
pip install -e .

With pip (Windows):

git clone https://github.com/prim-design/fusion-mcp.git
cd fusion-mcp
python -m venv .venv
.venv\Scripts\activate
pip install -e .

Requires Python 3.10+.

2. Install the Fusion 360 add-in

Copy the addin/ folder to Fusion's add-ins directory:

macOS:

cp -r addin/ "$HOME/Library/Application Support/Autodesk/Autodesk Fusion 360/API/AddIns/FusionMCP"

Windows:

xcopy /E addin "%APPDATA%\Autodesk\Autodesk Fusion 360\API\AddIns\FusionMCP\"

Then in Fusion 360: Shift+S → Add-Ins → select FusionMCP → Run (optionally check "Run on Startup").

3. Connect your MCP client

Claude Code:

claude mcp add fusion-mcp -- /path/to/fusion-mcp/.venv/bin/fusion-mcp

Claude Desktop — add to claude_desktop_config.json:

{
  "mcpServers": {
    "fusion-mcp": {
      "command": "/path/to/fusion-mcp/.venv/bin/fusion-mcp"
    }
  }
}

Works with any MCP client — run .venv/bin/fusion-mcp as a stdio server.

Tools (51)

Category	Tools
Sketch	create_sketch finish_sketch draw_line draw_rectangle draw_circle draw_arc draw_polygon draw_spline draw_slot
3D Features	extrude revolve sweep loft
Modifications	fillet chamfer shell draft
Patterns	pattern_rectangular pattern_circular mirror
Booleans	combine split_body
Components	create_component list_components delete_component move_component rotate_component rename
Joints	create_joint (all 7 types) set_joint_limits drive_joint list_joints
Rigid Groups	create_rigid_group list_rigid_groups delete_rigid_group
Inspection	get_design_info get_body_info measure check_interference fit_view screenshot
Export/Import	export_stl export_step export_3mf import_mesh
Utility	undo delete_body delete_sketch batch
Escape Hatch	execute_python — run arbitrary Python inside Fusion with full API access

Joint types

create_joint supports all 7 Fusion joint types: rigid, revolute, slider, cylindrical, pin_slot, planar, ball. Uses as-built joints by default (components stay in place).

Screenshot

screenshot captures the viewport as a PNG image returned directly to the AI. Supports preset views (front, back, top, bottom, left, right, iso) and custom camera positions via eye_x/y/z + target_x/y/z.

Important notes

• Units: All lengths in cm, all angles in degrees
• Z-negation gotcha: On XZ plane, sketch +Y = world -Z. On YZ plane, sketch +X = world -Z.
• Thread safety: The add-in dispatches all API calls to Fusion's main thread via CustomEvent
• Escape hatch: execute_python runs arbitrary Python inside Fusion for anything not covered by curated tools

How it works

The MCP server (server/) runs as a stdio process your AI agent connects to. It forwards commands over a TCP socket to the Fusion 360 add-in (addin/), which runs inside Fusion and executes API calls on the main thread using Fusion's CustomEvent system for thread safety.

License

MIT