agentcad
Open-source MCP server for AI agents to design, render, and export 3D CAD parts via code
agentcad is a razor-focused tool for AI-driven CAD automation. Pick it if you want agents to iterate geometry fast and verify results automatically; skip it if you need a GUI or collaborative editing. The recent Wright Flyer case study proves it can handle complex, multi-part assemblies. Pairs with Claude Code, Cursor, and Windsurf, offering a free, local way to let AI handle parametric design and export to STL/STEP/GLB/OBJ.
Verified 21h ago · liveness 63/100 · cite: rightaichoice.com/tools/agentcad
- AI agents designing 3D parts iteratively with a tight feedback loop
- Developers automating CAD workflows with LLMs
- Engineers prototyping with agent-driven design
- Hobbyists exploring generative CAD programmatically
- Artists needing interactive GUI modeling
- Users requiring collaborative real-time editing
- Beginners unfamiliar with Python scripting
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Skip agentcad if you need a visual, interactive GUI for CAD modeling or real-time collaborative editing, or if you're not comfortable with Python scripting and command-line workflows.
There are no paid plans or hidden costs—agentcad is fully open-source under Apache-2.0 and free to use.
agentcad is completely free and open-source—ideal for individual developers, startups, or anyone automating CAD with AI without per-seat costs. Compared to cloud CAD tools like Fusion 360 ($545/yr) or Onshape ($1,500/yr), agentcad costs nothing and runs locally. The only ongoing cost is the coding agent you pair it with (e.g., Claude Code subscription), if you use one.
In short
agentcad — Open-source MCP server for AI agents to design, render, and export 3D CAD parts via code. Best for AI agents designing 3D parts iteratively with a tight feedback loop, Developers automating CAD workflows with LLMs, Engineers prototyping with agent-driven design. Free to use.
Viability Score
How well maintained and how widely used is agentcad? Built from what the vendor actually publishes (docs, changelog, tutorials, integrations, pricing), whether the site is live, and how much real users discuss it. How we calculate this
Last calculated: September 2026
How we score →Key Features
- MCP server for Claude Code, Cursor, Windsurf
- CLI for local design and export
- Pre-execution validation in under 100ms
- Run scripts with build123d or CadQuery to produce versioned STEP files
- Render PNG views from any angle for visual verification
- Export to STL, GLB, OBJ for 3D printing and web viewers
- Topology inspection for debugging geometry issues
- Diff two versions: side-by-side renders, overlay, overlap score, structured metrics
- Spec-check mode: measure dimensions against a JSON checklist
- Zero-boilerplate scripts with pre-injected build123d primitives and edit helpers
- Installable agent skill for auto-discovery by Claude Code
- Works via uvx without prior install (MCP config snippet)
- Browser-based 3D viewing via three.js
- Named parts with stable IDs and labels for assemblies
- Groups: color-coded subassemblies that can be hidden or isolated
About agentcad
agentcad is an open-source MCP server and CLI that lets coding agents like Claude Code, Cursor, or Windsurf design, render, and export real CAD output. Built for developers and engineers who want to hand off CAD iteration to AI and get printable geometry back fast. It runs entirely locally, requires no signup, and is free under the Apache-2.0 license. Recent case studies show agents can reconstruct complex objects—like the 1903 Wright Flyer—from a single prompt, yielding 234 parts. The tool's feedback loop is its core: agents write scripts, get pre-execution validation in under 100ms, and receive structured JSON metrics (volume, face count, validity) plus PNG previews from any angle. Multi-format export to STEP, STL, GLB, and OBJ covers 3D printing and web viewers. The workflow is designed for human–agent collaboration: the agent reads its own metrics and renders, catches mistakes before handing off to you, and supports version diffing, spec-check mode, and topology inspection for debugging. Scripts require zero boilerplate—build123d primitives and edit helpers are pre-injected—and a pip install plus a skill install lets Claude Code auto-discover agentcad. A ten-minute walkthrough gets you from an empty folder to a printable part. Since it's a backend for AI-driven design, agentcad isn't a GUI replacement for Fusion 360 or Onshape; it's a focused tool for automated geometry creation with fast, measurable feedback. For teams automating CAD with LLMs, it's a free, local option that pairs directly with popular coding agents.
Behind the Verdict
We'd reach for agentcad when the goal is to let an AI agent own the geometry loop—drafting, validating, and revising 3D parts without a human babysitting every step. Its diff feature is unique: side-by-side renders, an overlap score per view, and structured metrics like volume and center of mass. That's not just a nice visual—it catches subtle mistakes, like the impeller that looked right in every render but sat 9.4 mm off its spin axis. For teams, that verification layer is the real value. Where it bites: it's Python and command-line only. If you or your team aren't comfortable with those, the learning curve is steep. And it's not a design tool in the interactive sense—you won't be clicking and dragging in a viewport. If you need that, Fusion 360 or Onshape remain the go-to, but they don't give agents the same programmatic loop. The closest alternative would be building your own MCP server around build123d or CadQuery, but you'd lose the pre-execution checks, metrics, and diff tooling that agentcad has out of the box. For hobbyists exploring generative CAD, the free price and local execution are a win. For enterprises, the lack of closed-source support might be a blocker, but the Apache-2.0 license gives you freedom to customize. Watch out for version skew: the tool targets Python 3.10–3.12, so confirm your environment before committing. Overall, agentcad is a smart, focused tool that fills a gap many agent-driven design workflows have.
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Real-world workflow fit
Concrete scenarios for the personas agentcad actually fits — and what changes day-one when you adopt it.
You want to quickly iterate on a snap-fit enclosure design.
Outcome: You prompt Claude Code to design an electronics enclosure with specific dimensions and wall thickness. Agentcad runs the script, shows you a PNG preview, and outputs a validated STEP file. You then use the diff command to compare versions and fine-tune the fit.
You want to design a custom phone stand for printing.
Outcome: You ask Cursor to create a phone stand with your dimensions. Agentcad validates the geometry, renders a preview, and exports an STL. You slice it and print—all from a chat prompt.
You need to generate multiple part variations from a base script.
Outcome: You use agentcad's --params to override dimensions for each variant, running scripts in a loop. Each run produces a versioned STEP and metrics, letting you compare and select the best design without manual modeling.
Use Cases
- Design a phone stand with specific dimensions and export it for 3D printing
- Iterate on an electronics enclosure with snap-fit lid by comparing version diffs
- Reconstruct a historical object like the Wright Flyer from measured drawings using prompts
- Generate a vase profile with variable thickness and validate volume constraints
- Automate CAD design for multiple part variants via script parameter overrides
- Inspect a STEP file for geometric errors before sending to fabrication
- Rebuild a child's toy from two photos as an assembly of 51 named parts
Limitations
- agentcad supports Python 3.10–3.12 only; OpenCascade bindings are not available for 3.13.
- It runs locally via CLI or MCP server, and requires a Python environment with the agentcad package.
- The tool is script-driven, with no GUI or browser-based editor.
as of 2026-08-19
Verification history
We have re-verified agentcad 8 times since . Each pass re-reads the vendor's own pages and re-checks every listed field against that evidence; passes where nothing had changed are marked as such.
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
Showing the 6 most recent of 8 verification passes.
Free to cite with attribution — this page re-verifies continuously.
12-month cost
Project the real annual outlay, including the implied monthly cost when only an annual tier is published.
Vendor list price only. Add-on usage, seat overages, and contract minimums are surfaced under Hidden costs & gotchas.
Plans compared
For each published agentcad tier: who it actually fits, and what it adds vs. the previous tier. Cross-reference the cost calculator above for projected annual outlay.
Open Source
$0/mo
Ideal for
Solo developers, hobbyists, and startups who want a free, local CAD automation tool without per-seat costs.
What this tier adds
Starting and only tier: fully free under Apache-2.0, includes all features (MCP server, CLI, exports, named parts) with no paywall or feature gates.
Where the pricing makes sense
The company stage and team size where agentcad's pricing actually pencils out — and where peers do it cheaper.
agentcad is completely free and open-source—ideal for individual developers, startups, or anyone automating CAD with AI without per-seat costs. Compared to cloud CAD tools like Fusion 360 ($545/yr) or Onshape ($1,500/yr), agentcad costs nothing and runs locally. The only ongoing cost is the coding agent you pair it with (e.g., Claude Code subscription), if you use one.
Setup time & first value
How long it actually takes to get something useful out of agentcad — broken out by persona, not the marketing-page minute.
For a developer familiar with Python: 5-10 minutes to install via pip and run your first design. If using an MCP-compatible agent like Claude Code, add ~5 minutes to configure .mcp.json and install the agent skill. No signup required—you can go from zero to a printed part in under an hour.
Switching to or from agentcad
How to bring data in from common predecessors and how to get it back out — written for the switcher, not the buyer.
- →From CLI CAD scripts (e.g., FreeCAD Python scripts): Wrap your scripts to use show_object() and pre-injected build123d primitives, then run via agentcad for metrics and previews.
- →From direct build123d scripts: Add agentcad run to get versioning, metrics, and rendering without replacing your core geometry code.
- ↗To Fusion 360: Export STEP files from agentcad and import them into Fusion 360 for interactive editing or manufacturing.
- ↗To Onshape: Upload STEP files to Onshape for cloud collaboration and real-time editing.
Integrations
Resources & Guides
Tutorials & Learning
Official links
Tools that pair well with agentcad
Common stack mates teams adopt alongside agentcad, with the specific reason each pairing earns its keep.
Featured Head-to-Head Comparisons
Agentcad vs Polycam
Polycam is the best choice for professionals needing photorealistic 3D scans and floor plans from real-world spaces. Agentcad is ideal for AI agents and developers who want to programmatically generate and iterate on 3D parts. Choose Polycam for reality capture; choose agentcad for agent-driven CAD design.
Agentcad vs Cognition Ai
Choose Cognition AI's Devin if you're an enterprise team needing autonomous software engineering with measurable productivity gains and a financial guarantee. Choose agentcad if you're a developer or AI agent building 3D parts programmatically with open-source, scriptable CAD tools. They solve fundamentally different problems: software engineering vs. mechanical design.
Agentcad vs Bito
Bito and agentcad serve completely different domains. Bito excels as a system-wide context layer for AI coding agents in multi-repo software projects, providing architectural awareness and automated scoping. agentcad is a focused, free open-source tool for AI-driven 3D part design using Python scripting. Choose Bito if you need cross-repo AI assistance; choose agentcad if your agents need to generate CAD files.
Alternatives to agentcad
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