What is freecad-mcp AGENTS.md?

Repository instructions for FreeCAD MCP, a server that lets AI tools perform computer-aided design operations in FreeCAD through the Model Context Protocol.

Use them when developing, testing, or documenting FreeCAD operations exposed through local or web-based MCP connections.

They explain the required tool behavior, response format, and connection methods, reducing mistakes when adding or changing CAD operations.

How sandraschi/freecad-mcp configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to sandraschi/freecad-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/sandraschi/freecad-mcp/master/AGENTS.md

Clone the repo

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

Made for: Codex, OpenCode.

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/instructions/sandraschi/freecad-mcp/agents-md/github.svg)](https://agentmods.dev/instructions/sandraschi/freecad-mcp/agents-md)

Your own site

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

Per session 945 This file is loaded in full into every session.

When invoked 945 The same file — it is already loaded in full.

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	$0.00945	$0.00945
Opus 5.5	$0.00378	$0.00378
Sonnet 5.5	$0.00189	$0.00189
Haiku 4.5	$0.00094	$0.00094

Measured 15d ago against content hash d350f985f2e9, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

freecad-mcp AGENTS.md 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 15d 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.

AGENTS.md · 37 lines

How it starts

The opening of the file, as written. The whole thing — 37 lines — stays where its author put it; the contents beside it link to each section on GitHub.

freecad-mcp — Agent Guide

Overview

FreeCAD MCP server — Parametric 3D CAD modeling, 2D TechDraw drafting, 2D constraint sketching, multi-part STEP assemblies, generative topology optimization, CFD (OpenFOAM CPU + FluidX3D GPU), and CalculiX FEM structural stress analysis via 60 MCP tools and REST API.

Core Capabilities for Fleet Agents

Capability	Core MCP Tools	Output Formats	Fleet Handoff Targets
Parametric CAD & Extrusion	`freecad_model` (`sketch`), `create_shape`	STEP, STL, FCStd	`qcad-mcp`, `prusa-slicer-mcp`
2D Engineering Blueprints	`freecad_model` (`techdraw`)	SVG, PDF	`mcp-central-docs`
Multi-Part STEP Assemblies	`freecad_model` (`assembly`, `inspect_assembly`)	STEP, STL, Tree JSON	`robotics-mcp` (URDF)
Generative Weight Reduction	`freecad_model` (`generative`)	STEP, Volume JSON	`robotics-mcp`, `prusa-slicer-mcp`
Heuristic Edge Filleting	`freecad_model` (`heuristic_fillet`)	STEP	Manufacturing pipelines
Architectural BIM / IFC	`bim_create_wall`, `bim_export_ifc`	IFC, FCStd	Architecture workflows
OpenFOAM CFD (CPU)	`cfd_create_domain`, `cfd_snappy_mesh`, `cfd_configure_physics`, `cfd_post_process`	OpenFOAM case, Cd/Cl JSON	`openfoam-mcp`
Fluid-Structure Interaction (FSI)	`cfd_map_loads_to_fem`	CalculiX INP, Stress MPa	`freecad-mcp` (FEM)
FluidX3D GPU LBM CFD	`cfd_fluidx3d_setup`, `cfd_fluidx3d_export_for_render`	VTK, OBJ Streamlines, WebM	`godot-mcp`, `resonite-mcp` (VR)
CalculiX Structural FEM	`fem_create_analysis`, `run_fem_analysis`	Von Mises Stress MPa, INP	Engineering validation

Standards & Patterns

FastMCP 3.4+ Portmanteau Pattern: Portmanteau tool freecad_model maps execution_mode ("hands_off" or "hands_in") to underlying operational modules in src/freecad_mcp/model_ops.py.
Annotation Constants: Every @mcp.tool() explicitly includes annotations=READ_ONLY or annotations=MUTATING.
Dual Execution Architecture: Prefers live FreeCAD TCP bridge (port 11968) for full B-Rep tree access; automatically falls back to headless FreeCADCmd subprocess if GUI is not connected.
REST Control Endpoint: POST http://localhost:10944/api/v1/control/tool with payload {"tool": "...", "arguments": {...}}.

Read the full file on GitHub · 37 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.

15d ago Changed · -1 tokens per session d350f985f2e9
1mo ago Changed ed2f9acbfc18
2mo ago Changed · +19 lines · +751 tokens per session b33e552dcf13
2mo ago First seen · 18 lines · 195 tokens per session scan A f3e578326b25

Subscribe to this mod's changes

freecad-mcp AGENTS.md is an instructions file published in the GitHub repository sandraschi/freecad-mcp (33 stars, last pushed 6d ago), licensed MIT. It adds 945 tokens to every session, about $0.0038 per session on Opus 5.5. 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-mcp AGENTS.md next to 6 instructions from other repositories
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freecad-mcp: Instructions file for Codex