MCP100 Assessment

Editorial verdict

Shortlist retained after reviewed Batch 1 re-audit: arbitrary_python_execution_without_server_side_disable_or_allowlist.

Reviewed September 23, 2026

Task Fit

Mapped

Specialized workflows

Trust

Status warning

arbitrary_python_execution_without_server_side_disable_or_allowlist

Maintenance

Activity observed

A dated repository or package update is available; editorial maintenance review is still pending.

Popularity

Signals available

Visible usage signals are shown for discovery only, not as proof of safety.

Best for

Creating, inspecting, and modifying FreeCAD documents through an AI-assisted desktop workflow

Not ideal for

Final engineering sign-off, safety-critical CAD, or manufacturing output without expert verification

Avoid if

Generated model changes cannot be reviewed, regenerated, and reverted before downstream use

Trade-offs

Agent control can speed repetitive modeling, but CAD operations are stateful and seemingly valid geometry may still violate design intent or constraints.

Evidence scope

Evidence

Current source snapshot

Popularity

2.5k MCP repository stars

35.3k package downloads / 30 days

Repository identity: neka-nat/freecad-mcp

Package identity: freecad-mcp · version 0.1.25

Stars observed September 24, 2026 · Downloads observed September 8, 2026

Exact reviewed repository metric.

Exact reviewed package distribution.

Maintenance

Publisher activity observed August 7, 2026

Current source snapshot

Trust review

Source relationship: Community implementation

Reviewed September 23, 2026

Sources

GitHub repository ↗

Supporting evidence (5)

GitHub pull request #114 ↗Source file: configuration.md ↗Source file: execution.md ↗Source file: tools.md ↗Source file: pyproject.toml ↗

Evidence-backed setup

Install & Agents

Choose your MCP client. A client connects to the MCP server; the language model is selected inside that client. Only stored, source-backed configurations are shown.

Claude Code

Local stdio

MCP100 logic checked

claude mcp add freecad -- uvx "freecad-mcp"

The publisher connection details were combined with this client's official MCP transport configuration; installation was not executed by MCP100.

Verify safely: Restart Claude Code, confirm freecad tools are listed, and perform one read-only test with non-sensitive data.

Uninstall and revoke

Remove freecad from Claude Code, restart the client, remove any separately installed package, and revoke dedicated credentials if used.

Evidence & methodology

Publisher-documented setup is not the same as MCP100 execution testing. “MCP100 logic checked” means the stored configuration shape was reviewed, not that third-party MCP software was run.

Evidence checked 2026-08-12

Evidence 1 ↗Evidence 2 ↗

Read additional publisher installation details

From the publisher README

Publisher installation details

Original client setup and configuration retained from the publisher documentation.

View original README ↗

Publisher-documented clients

Claude Desktop

These names appear in the publisher's installation documentation. MCP100-verified configurations are shown separately above when available.

Quick start

You need FreeCAD and uv / uvx. FreeCAD MCP has two components: an addon running inside FreeCAD and an MCP server launched by your client.

1. Install and start the FreeCAD addon

git clone https://github.com/neka-nat/freecad-mcp.git
cd freecad-mcp

Copy addon/FreeCADMCP into your FreeCAD addon directory, then restart FreeCAD. Select the MCP Addon workbench and click Start RPC Server in the FreeCAD MCP toolbar.

See the installation guide for platform-specific commands and screenshots.

2. Connect Claude Desktop

Add the following entry to claude_desktop_config.json:

{
  "mcpServers": {
    "freecad": {
      "command": "uvx",
      "args": ["freecad-mcp"]
    }
  }
}

Restart Claude Desktop to load the configuration, keep FreeCAD open with its RPC server running, and ask Claude to create a model. Connections use localhost by default.

Loading optional publisher installation details…

Capability

What it does

This repository is a FreeCAD MCP that allows you to control FreeCAD from Claude Desktop.

Other ToolsManufacturing & Industrial

Representative uses

Creating, inspecting, and modifying FreeCAD documents through an AI-assisted desktop workflow

Important limits

Final engineering sign-off, safety-critical CAD, or manufacturing output without expert verification

Tools12 toolsView tools

Model Creation & Editing6 tools
Create FreeCAD documents and build or modify the objects inside them. Insert reusable parts, edit or remove geometry, and execute supported code when a modeling task needs operations beyond the basic object tools.
Model Inspection & Parts4 tools
Inspect the current model before deciding what to change. Review the active view, list or fetch document objects, and browse the FreeCAD Parts Library to find reusable parts that can be inserted into the design.
Engineering Analysis & Session2 tools
Run finite-element analysis on supported models and verify the RPC connection used to control FreeCAD. These capabilities support engineering validation and help diagnose whether the automation session itself is healthy.

View tool names (12)

create_document
create_object
edit_object
delete_object
execute_code
insert_part_from_library
get_view
get_objects
get_object
get_parts_list
get_rpc_status
run_fem_analysis

Context Footprint

~2.4K estimated schema tokens

Context impact: Low

Estimated token footprint of the MCP tool schemas exposed to the agent.

Approx. estimate

Whole-profile rough estimate only. Do not synthesize per-tool token values from this heuristic.

Reviewed access

Access & risk

Review the exact access boundary before connecting this MCP to accounts, credentials, or sensitive data.

Authentication: IP allowlisting is documented for RPC access. User credentials, tokens, OAuth, and other authentication are not documented.
Permissions: Controls FreeCAD documents and objects, including create, edit, and delete operations. It can execute arbitrary Python, take screenshots, inspect objects, insert parts, and run FEM analysis.
Data handling: Processes local FreeCAD documents, objects, screenshots, and analysis files. RPC is localhost by default and can be configured for remote IP or CIDR access. External telemetry and retention are not documented.
Cost: No MCP project or service price is documented. FreeCAD and related dependency costs are separate.
Risk and cautions: Arbitrary Python and destructive document operations provide very high local control. Keep RPC on localhost; if remote access is necessary, use a restrictive allowlist and additional authentication because IP filtering is not user authentication.

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Read publisher documentation

Publisher documentation

Publisher README

Original product, capability, tool, and usage documentation from the MCP publisher. Installation sections appear under Install & Agents.

View original README ↗

FreeCAD MCP

Control FreeCAD from Claude Desktop and other MCP clients. Create and edit models, run Python scripts, inspect documents, and run FEM analyses.

Demo

Design a flange:

See more demos and examples for a toy car, modelling from a 2D drawing, and agent integrations.

Documentation

Guide	Contents
Installation	Addon directories, setup screenshots, running from source
Configuration	Auto-start, text feedback, remote connections
Tools	Available tools, screenshots, FEM analysis
Code execution	GUI execution, background jobs, headless scripts, timeout troubleshooting
Demos and examples	Design demos, FEM example, ADK and LangChain integrations

Contributors

Made with contrib.rocks.

Loading optional publisher documentation…

FAQ

What can FreeCAD MCP do?

This repository is a FreeCAD MCP that allows you to control FreeCAD from Claude Desktop.

Can it create FreeCAD documents and create, edit, or delete objects?

Yes. The reviewed surface includes creating a document, creating and editing objects, and deleting objects. The current reviewed tool list does not establish a separate delete-document action, so the question should not imply that.

Does FreeCAD MCP work with Claude Code?

Yes. MCP100 reviewed an evidence-backed setup for Claude Code, but has not independently verified it with a live runtime test.

Does FreeCAD MCP require authentication?

IP allowlisting is documented for RPC access. User credentials, tokens, OAuth, and other authentication are not documented.

What are the risks of its arbitrary Python and destructive document access?

Arbitrary Python and destructive document operations provide very high local control. Keep RPC on localhost; if remote access is necessary, use a restrictive allowlist and additional authentication because IP filtering is not user authentication.

Is this an official MCP?

neka-nat is listed as Community implementation in MCP100’s current evidence.

Current implementation resources:

Community implementation source ↗