Design vs build123d MCP
Design is a plugin bundle for AI coding tools published by Anthropic. Marketplaces we read that list it: 1 (Claude: knowledge-work-plugins). build123d MCP is an MCP server published by pzfreo. Marketplaces we read that list it: 1 (Official MCP Registry). As of our marketplace pass on 2026-10-19. This pair was picked by a reader, not by our comparison rule, so search engines are asked not to index the page.
Where each is published
| Marketplace |  build123d MCP | |
|---|---|---|
| Claude: knowledge-work-plugins | Listed Version: 1.2.0 Forks (GitHub): 3 427 Stars (GitHub): 30 326 Not marked · First seen |
Not listed |
| Official MCP Registry | Not listed | Listed Version: 0.3.91 Downloads/month (PyPI): 5 102 Downloads/week (PyPI): 1 587 Forks (GitHub): 15 Stars (GitHub): 117 Not marked · First seen |
Each figure is the marketplace's own and is never added up across marketplaces. A marketplace that publishes no figure shows none: no number is not zero.
The facts side by side
| Fact | Design | build123d MCP |
|---|---|---|
| Marketplaces that list it | 1 | 1 |
| Stars (GitHub) (differs) | 30 326 (better) | 117 (worse) |
| Forks (GitHub) (differs) | 3 427 (better) | 15 (worse) |
| Last release (differs) | Not published | 2026-10-15 |
| Where it runs (differs) | Installs as a plugin bundle | On your machine (build123d-mcp) |
| Transport (differs) | Not stated | stdio |
| Tools it declares | Not published | Not published |
| Environment variables it asks for | Not published | Not published |
| Parts of the bundle (differs) | 16 | Not a bundle |
| Licence | Not stated | Not stated |
| Repository (differs) | github.com/anthropics/knowledge-work-plugins | github.com/pzfreo/build123d-mcp |
| Changes in the last 7 days (differs) | 0 | 1 |
| First seen | 2026-10-11 | 2026-10-11 |
Lines where the two differ have a tinted background and bold values. Where the data itself says which value is better (more marketplaces, a larger figure of the same marketplace, a fresher release, a verified mark on a marketplace that lists both), the better one is also marked green with ▲ and the worse one red with ▼. Where it runs, the transport, the tools, the settings, hooks, the bundle's parts, the licence and the week's changes are marked only as different: more or fewer is not better in itself.
What each says it does
Design
Accelerate design workflows — critique, design system management, UX writing, accessibility audits, research synthesis, and dev handoff. From exploration to pixel-perfect specs.
build123d MCP
AI-driven 3D CAD via build123d: execute, render, measure, and export geometry interactively.
How to run each
Design As a Claude Code plugin
/plugin marketplace add anthropics/knowledge-work-plugins
/plugin install design@knowledge-work-pluginsbuild123d MCP As a local MCP server: PyPI package
claude mcp add --transport stdio build123d-mcp -- uvx build123d-mcpCommands built only from what the marketplaces declare; the full set for every client is on each card.
Tools each declares
Neither one's marketplaces publish a list of tools, so there is nothing to compare.
Settings each asks for
Neither one's marketplaces publish the settings it asks for.
What it can do: Design · What it can do: build123d MCP · Compare two other plugins
Data comes from the public marketplace file https://github.com/anthropics/knowledge-work-plugins/blob/HEAD/.claude-plugin/marketplace.json. Data comes from the Official MCP Registry (registry.modelcontextprotocol.io), CC0 1.0. Figures come from our own regular passes over the marketplaces, last read on . We publish no contact details for plugin publishers.