Fusion360 MCP Server

Beta — This project is under active development. APIs and tool behavior may change between releases. Use at your own discretion. Feedback and bug reports welcome via GitHub Issues.

MCP server that connects AI coding agents to Autodesk Fusion 360 for CAD automation.

Tested with Claude Code. Works with any MCP-compatible client — OpenCode, Codex, Cursor, or anything that speaks the Model Context Protocol.

How it works

Any MCP Client ←(stdio MCP)→ This Server ←(TCP :9876)→ Fusion360MCP Add-in ←(CustomEvent)→ Fusion Main Thread

Two components:

MCP Server (this repo) — Python process that speaks MCP protocol to Claude and forwards commands over TCP
Fusion360MCP Add-in (installed in Fusion's AddIns folder) — runs inside Fusion 360, executes API calls safely on the main thread

Prerequisites

uv (Python package manager)
Autodesk Fusion 360
An MCP-compatible client (Claude Code, OpenCode, Codex, Cursor, etc.)

Installation

1. Install the Fusion 360 Add-in

Quick install (symlink for development):

./scripts/install-addon.sh

Manual install:

# macOS
cp -r addon ~/Library/Application\ Support/Autodesk/Autodesk\ Fusion\ 360/API/AddIns/Fusion360MCP

# Windows (PowerShell)
Copy-Item -Recurse addon "$env:APPDATA\Autodesk\Autodesk Fusion 360\API\AddIns\Fusion360MCP"

Then start it in Fusion: Shift+S → Add-Ins → Fusion360MCP → Run

You should see [MCP] Server listening on localhost:9876 in the TEXT COMMANDS window.

2. Connect your MCP client

The MCP server is published on PyPI — no need to clone this repo.

Claude Code

claude mcp add fusion360 -- uvx fusion360-mcp-server --mode socket

Other MCP clients

The server runs over stdio, so any MCP-compatible client can launch it. The command is:

uvx fusion360-mcp-server --mode socket

Cursor (~/.cursor/mcp.json)

{
  "mcpServers": {
    "fusion360": {
      "command": "uvx",
      "args": [
        "fusion360-mcp-server",
        "--mode", "socket"
      ]
    }
  }
}

Cross-machine setup (LAN)

If the MCP server and Fusion 360 run on different machines (e.g. MCP server on a Mac Mini, Fusion on a Windows PC), override the bind/connect address via environment variables on both sides.

On the Fusion host (where the add-in runs), bind to all interfaces before starting Fusion:

# Windows
$env:FUSION_MCP_HOST = "0.0.0.0"

# macOS / Linux
export FUSION_MCP_HOST=0.0.0.0

Then start Fusion and run the Fusion360MCP add-in. The log line Server listening on 0.0.0.0:9876 confirms the bind.

On the MCP-server host, point the client at the Fusion host's LAN IP:

# Either via CLI flag
uvx fusion360-mcp-server --mode socket --host 192.168.1.42

# Or via env var (useful in MCP client configs)
FUSION_MCP_HOST=192.168.1.42 uvx fusion360-mcp-server --mode socket

Security note: the TCP socket has no authentication. Only expose it on a trusted LAN — never bind to 0.0.0.0 on a host reachable from the public internet.

3. Verify

Call the ping tool from your client. If it returns {"pong": true}, everything is connected.

Uninstalling

Remove the fusion360 entry from your MCP client config
Stop the add-in in Fusion (Shift+S → Add-Ins → Fusion360MCP → Stop)
Delete the add-in folder from Fusion's AddIns directory

Available Tools (89)

Scene & Query

Tool	Description
`ping`	Health check (instant, no Fusion API)
`get_scene_info`	Design name, bodies, sketches, features, camera
`get_object_info`	Detailed info about a named body or sketch
`get_bounding_box`	Axis-aligned bbox (min/max/size/center) for body or component; unions all bodies when called on a component
`list_components`	List all components in the design

Design Type Safety

Tool	Description
`get_design_type`	Check if design is in parametric or direct mode
`set_design_type`	Switch design type (parametric/direct recovery)

Sketching

Tool	Description
`create_sketch`	New sketch on xy/yz/xz plane, optional offset
`draw_rectangle`	Rectangle in most recent sketch
`draw_circle`	Circle in most recent sketch
`draw_line`	Line in most recent sketch
`draw_arc`	Arc (center + start + sweep angle)
`draw_spline`	Fit-point or control-point spline
`create_polygon`	Regular polygon (3–64 sides)
`add_constraint`	Geometric constraint (coincident, parallel, tangent, etc.)
`add_dimension`	Driving dimension (distance, angle, radial, diameter)
`offset_curve`	Offset connected sketch curves
`trim_curve`	Trim at intersections
`extend_curve`	Extend to nearest intersection
`project_geometry`	Project edges/bodies onto sketch plane

Features

Tool	Description
`extrude`	Extrude a sketch profile
`revolve`	Revolve a profile around an axis
`sweep`	Sweep a profile along a path
`loft`	Loft between two or more profiles
`fillet`	Round edges (all/top/bottom/vertical)
`chamfer`	Chamfer edges
`shell`	Hollow out a body
`mirror`	Mirror a body across a plane
`create_hole`	Hole feature on a body face
`rectangular_pattern`	Pattern in rows and columns
`circular_pattern`	Pattern around an axis
`create_thread`	Add threads (cosmetic or modeled)
`draft_faces`	Draft/taper faces for mold release
`split_body`	Split a body using a plane
`split_face`	Split faces of a body
`offset_faces`	Push/pull faces by a distance
`scale_body`	Scale uniformly or non-uniformly
`suppress_feature`	Suppress a timeline feature
`unsuppress_feature`	Re-enable a suppressed feature

Body Operations

Tool	Description
`move_body`	Translate a body by (x, y, z)
`rename_body`	Rename a body (searches root and all components)
`boolean_operation`	Join/cut/intersect two bodies
`delete_all`	Clear the design
`undo`	Undo last operation (with design-type safety guard)

Direct Primitives

Tool	Description
`create_box`	Box (via TemporaryBRepManager, history-less)
`create_box_parametric`	History-based box: sketch rectangle + dimensions + extrude. `length`/`width`/`height` accept numbers (cm) or string expressions referencing User Parameters (e.g. `"boxL"`, `"outer - 2*wall_t"`)
`create_cylinder`	Cylinder
`create_sphere`	Sphere
`create_torus`	Torus

Surface Operations

Tool	Description
`patch_surface`	Create a patch surface from boundary edges
`stitch_surfaces`	Stitch surface bodies into one
`thicken_surface`	Thicken a surface into a solid
`ruled_surface`	Ruled surface from an edge
`trim_surface`	Trim a surface with another body

Sheet Metal

Tool	Description
`create_flange`	Create a flange on an edge
`create_bend`	Add a bend
`flat_pattern`	Create flat pattern
`unfold`	Unfold specific bends

Construction Geometry

Tool	Description
`create_construction_plane`	Offset, angle, midplane, 3-point, tangent
`create_construction_axis`	Two-point, intersection, edge, perpendicular

Assembly

Tool	Description
`create_component`	Create a sub-assembly component
`add_joint`	Joint between two components
`create_as_built_joint`	Joint from current positions
`create_rigid_group`	Lock components together

Inspection & Analysis

Tool	Description
`measure_distance`	Minimum distance between entities
`measure_angle`	Angle between entities
`get_physical_properties`	Mass, volume, area, center of mass
`create_section_analysis`	Section plane through model
`check_interference`	Detect collisions between components

Appearance

Tool	Description
`set_appearance`	Assign material appearance from library

Parameters

Tool	Description
`get_parameters`	List all user parameters
`create_parameter`	Create a new parameter
`set_parameter`	Update a parameter value
`delete_parameter`	Remove a parameter

Import / Export

Tool	Description
`import_mesh`	Import STL/OBJ/3MF as mesh body via `MeshBodies.addByFile()`. Unit-aware (`mm`/`cm`/`m`/`in`/`ft`). Returns the mesh name and bounding box
`export_stl`	Export body as STL (supports bodies inside components)
`export_step`	Export body as STEP (supports bodies inside components)
`export_f3d`	Export design as Fusion archive
`export`	Unified dispatcher — routes to `export_stl`/`export_step`/`export_f3d` based on explicit `format` or file-extension inference

CAM / Manufacturing

Tool	Description
`cam_create_setup`	Create a manufacturing setup (milling/turning/cutting)
`cam_create_operation`	Add a machining operation (face, contour, adaptive, drilling, etc.)
`cam_generate_toolpath`	Generate toolpaths for operations
`cam_post_process`	Post-process to G-code (fanuc, grbl, haas, etc.)
`cam_list_setups`	List all manufacturing setups
`cam_list_operations`	List operations in a setup
`cam_get_operation_info`	Get operation details (strategy, tool, parameters)

Code Execution

Tool	Description
`execute_code`	Run arbitrary Python in Fusion (REPL-style)

MCP Protocol Features

Tool annotations — each tool is tagged with readOnlyHint, destructiveHint, and idempotentHint so MCP clients can auto-approve safe operations
Resources — fusion360://status, fusion360://design, fusion360://parameters for passive state inspection
Resource templates — fusion360://body/{name}, fusion360://component/{name} for dynamic entity lookup
Prompts — create-box, model-threaded-bolt, sheet-metal-enclosure workflow templates
Structured errors — tool results include isError=True when the add-in reports failures
Mock mode — --mode mock returns plausible test data without Fusion running (all responses include "mode": "mock")

Development

uv sync --dev       # install deps
uv run pytest -v    # run tests (171 tests)
uv run ruff check   # lint

Notes

All Fusion API units are centimeters (Fusion's internal unit).
One operation per tool call. Batching multiple operations crashes the add-in.
Commands time out after 30 seconds.
Add-in logs to ~/fusion360mcp.log.
The undo tool includes a design-type safety guard — it checks before/after and auto-redoes if the undo would switch from parametric to direct mode.

Acknowledgements

Inspired by BlenderMCP — the socket bridge architecture originated there.

Also built on ideas from the existing Fusion 360 MCP ecosystem:

License

MIT

Name		Name	Last commit message	Last commit date
.claude		.claude
.github/workflows		.github/workflows
addon		addon
devcontainer		devcontainer
scripts		scripts
src/fusion360_mcp		src/fusion360_mcp
tests		tests
.gitignore		.gitignore
AGENTS.md		AGENTS.md
LICENSE		LICENSE
README.md		README.md
pyproject.toml		pyproject.toml
uv.lock		uv.lock

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