FreeCAD MCP Server

MCP server for FreeCAD — the leading open-source parametric 3D CAD modeler. Enables AI agents to create and modify 3D models, manage parametric features, generate parts and assemblies, export design files, and integrate FreeCAD's powerful parametric modeling capabilities into AI-assisted engineering and design workflows.

Evaluated Mar 06, 2026 (0d ago) vcurrent

Homepage ↗ Repo ↗ Developer Tools freecad cad 3d-modeling parametric-design mcp-server engineering open-source

⚙ Agent Friendliness

/ 100

Can an agent use this?

🔒 Security

/ 100

Is it safe for agents?

⚡ Reliability

/ 100

Does it work consistently?

Score Breakdown

⚙ Agent Friendliness

MCP Quality

Documentation

Error Messages

Auth Simplicity

100

Rate Limits

🔒 Security

TLS Enforcement

Auth Strength

Scope Granularity

Dep. Hygiene

Secret Handling

Local CAD modeling. No external access. Design files may contain proprietary IP — secure file storage.

⚡ Reliability

Uptime/SLA

Version Stability

Breaking Changes

Error Recovery

Best When

An engineer or designer using FreeCAD wants AI agents to automate parametric design tasks — creating and modifying 3D models programmatically through FreeCAD's Python API.

Avoid When

You use commercial CAD software — Fusion 360, SolidWorks, and others have their own automation tools. FreeCAD is specifically for the open-source CAD community.

Use Cases

• Creating parametric 3D parts from design specifications by engineering agents
• Modifying existing CAD models based on parameter changes by design automation agents
• Generating assembly designs from component specifications by product design agents
• Exporting CAD models in various formats (STEP, STL, DXF) by manufacturing agents

Not For

• Teams using SolidWorks, Fusion 360, or other commercial CAD (FreeCAD-specific)
• Real-time collaborative CAD editing
• Organizations requiring commercial CAD format compatibility (CATIA, NX)

Interface

REST API

GraphQL

gRPC

MCP Server

Yes ↗

SDK

Webhooks

Authentication

Methods: none

OAuth: No Scopes: No

No authentication — local FreeCAD automation. FreeCAD must be installed.

Pricing

Model: free

Free tier: Yes

Requires CC: No

FreeCAD is free and open source (LGPL). MCP server is free open source from spkane.

Agent Metadata

Pagination

none

Idempotent

Partial

Retry Guidance

Not documented

Known Gotchas

⚠ FreeCAD requires GUI for some operations — headless mode has limitations
⚠ FreeCAD Python API has changed significantly across versions — check version compatibility
⚠ Parametric constraints can fail silently — validate geometry after operations
⚠ spkane's 'robust' version aims to handle FreeCAD's reliability challenges

Alternatives

fusion-360-mcp-server openscad-mcp solidworks-mcp

Full Evaluation Report

Detailed scoring breakdown, competitive positioning, security analysis, and improvement recommendations for FreeCAD MCP Server.

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API endpoint ↗ Agent guide ↗ Report inaccuracy

Scores are editorial opinions as of 2026-03-06.