What is freecad-expert?

A FreeCAD MCP server for computer-aided design, building modeling, and engineering simulation. It can connect to the FreeCAD desktop application or use FreeCADCmd, and provides tools for models, BIM, meshes, and fluid simulations.

Use it to inspect CAD files, create shapes, convert STEP files to STL, build BIM elements, import or export IFC, set up CFD cases, run solvers, and read simulation results.

It lets an AI agent perform FreeCAD operations through defined tools instead of requiring every modeling or simulation step to be done manually in the desktop interface.

freecad-expert — Skill for Claude Code by sandraschi

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add sandraschi/freecad-mcp --skill freecad-expert

Clone the repo

git clone --depth 1 https://github.com/sandraschi/freecad-mcp

Made for: Claude Code.

Or install freecad-mcp, the plugin that ships this one along with the rest of its 2 skills.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/sandraschi/freecad-mcp/freecad-expert/github.svg)](https://agentmods.dev/skills/sandraschi/freecad-mcp/freecad-expert)

Your own site

<a href="https://agentmods.dev/skills/sandraschi/freecad-mcp/freecad-expert"><img src="https://agentmods.dev/badge/skills/sandraschi/freecad-mcp/freecad-expert/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/sandraschi/freecad-mcp/freecad-expert"><img src="https://agentmods.dev/badge/skills/sandraschi/freecad-mcp/freecad-expert.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 0 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 687 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00000	$0.00687
Opus 5	$0.00000	$0.00344
Sonnet 5	$0.00000	$0.00137
Haiku 4.5	$0.00000	$0.00069

Measured 12d ago against content hash bacac555702a, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

freecad-expert scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

mcpb/src/freecad_mcp/skills/freecad-expert/SKILL.md · 53 lines

How it starts

The opening of the file, as written. The whole thing — 53 lines — stays where its author put it; the contents beside it link to each section on GitHub.

FreeCAD MCP Expert

Overview

FreeCAD MCP is a FastMCP 3.4+ server providing 46+ CAD/CAM/CAE tools. It operates through a TCP bridge to FreeCAD GUI or via FreeCADCmd subprocess fallback.

Tools by Category

Core CAD

freecad_status — Check FreeCAD availability and version
step_to_stl — Convert STEP/STP assemblies to STL mesh
model_info — Read CAD file metadata (objects, solids, bounding box, volume)
create_shape — Generate geometric primitives (box, cylinder, sphere, cone) and export STL
freecad_gui — Launch FreeCAD GUI, optionally opening a file

BIM (Building Information Modeling)

bim_create_wall, bim_create_slab, bim_create_column, bim_create_window, bim_create_door, bim_create_roof
bim_export_ifc, bim_import_ifc
bim_status, mesh_to_solid

CFD (OpenFOAM Pipeline)

cfd_status, cfd_create_domain, cfd_configure_physics, cfd_set_boundary
cfd_build_case, cfd_run_solver, cfd_read_results
cfd_parametric_study, cfd_nl2foam, cfd_sample_for_pinns

FluidX3D (GPU CFD)

cfd_fluidx3d_status, cfd_fluidx3d_prebuilt, cfd_fluidx3d_setup
cfd_fluidx3d_compile, cfd_fluidx3d_run, cfd_fluidx3d_results, cfd_fluidx3d_explain

FEM (Structural Analysis)

fem_status, fem_create_analysis, fem_set_material, fem_set_constraint
fem_mesh, fem_run, fem_read_results, run_fem_analysis

Slicing & 3D Printing

slicer_status, slice_stl — PrusaSlicer G-code generation

Marketplace

marketplace_search, marketplace_download, marketplace_categories
Prefab card: show_marketplace_card

Best Practices

Start with freecad_status() to confirm FreeCAD is reachable
Upload files via POST /api/v1/upload REST endpoint
Use cad_depot for persistent file storage across sessions
For CFD: build case with cfd_create_domain → configure physics → set boundaries → build → run → read results
Bridge mode (TCP) is preferred over subprocess for complex operations

Read the full file on GitHub · 53 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

12d ago First seen · 53 lines · 0 tokens per session scan A bacac555702a

Subscribe to this mod's changes

freecad-expert is a skill published in the GitHub repository sandraschi/freecad-mcp (25 stars, last pushed 5d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 687 tokens. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

cad-3d cfd fastmcp-3 freecad mcp-server webapp

freecad-expert