surfcad-agent
Bring-your-own-agent SurfCAD skill and helper library. SurfCAD is a web CAD app on a custom Manifold kernel. Agents bring their own model. This repo has no API keys and does not call a hosted model.
Pre-release. Version 0.1.0 is the tree layout, the vendored helper runtime, and the skill. The MCP server in packages/mcp-server is a placeholder (the stdio process is a later revision). server.json and the registry publish flow are not in this revision. Nothing here is published to npm from this tree.
npm surfcad and npm surfcad-mcp already exist as 0.0.1 placeholders ("coming soon"). This repo's packages are 0.1.0 and are not published yet. The plugin .mcp.json points at surfcad-mcp@0.1.0, which will not resolve from the registry until that version is published.
License: Apache-2.0.
Layout
.claude-plugin/marketplace.json marketplace name: surfcad-agent
plugins/surfcad/ plugin name: surfcad (no bin/)
.claude-plugin/plugin.json
.mcp.json npx -y surfcad-mcp@0.1.0
skills/surfcad/SKILL.md skill name: surfcad
skills/surfcad/references/
packages/surfcad/ npm surfcad, the helper library
UPSTREAM pinned 3dculos SHA
vendor/ copy of that commit's sync-files.json list
packages/mcp-server/ npm surfcad-mcp, placeholder
scripts/sync-3dculos.mjs re-vendor the pin
scripts/gen-references.mjs regenerate four skill references
There is one skill folder. There is no .claude/skills or .agents/skills copy.
Helper library
packages/surfcad re-exports loadManifold, runScript, helperScope, and the STL / 3MF / STEP exporters. The wasm is vendor/built/manifold.wasm, resolved from the package directory, so it works from node_modules/surfcad without depending on the process working directory. It is the custom kernel shipped with 3dculos, not npm manifold-3d.
The pin is the full SHA in packages/surfcad/UPSTREAM. npm run sync downloads that commit from GitHub, copies every runtimeFiles and catalogFiles path from sync-files.json into vendor/ (paths kept), and writes vendor/MANIFEST.json. CI runs the sync again and fails if the tree differs.
npm test
Run that from this directory. The headless test builds a filleted box, a two-body assembly, and a bent sheet, and checks status, bounding box, volume, body count, and non-empty STL, 3MF, and STEP.
Install the skill
| Agent | Skill | MCP |
|---|---|---|
| Claude Code | /plugin marketplace add artur0x0/surfcad-agent then /plugin install surfcad@surfcad-agent | The plugin .mcp.json starts npx -y surfcad-mcp@0.1.0 once that version is published. Standalone: claude mcp add --transport stdio surfcad -- npx -y surfcad-mcp@0.1.0 |
| claude.ai / Cowork | Customize, Plugins, Add marketplace artur0x0/surfcad-agent, or upload the plugins/surfcad folder | Chat needs a remote HTTP server. This revision ships stdio config only, so Chat gets the skill without tools |
| Claude API | Upload plugins/surfcad/skills/surfcad (name matches the folder) | — |
| Grok Build | Reads this Claude marketplace, or npx skills add artur0x0/surfcad-agent -a grok | grok mcp add surfcad -- npx -y surfcad-mcp@0.1.0 |
| Hermes | hermes skills install artur0x0/surfcad-agent/plugins/surfcad/skills/surfcad | hermes mcp add surfcad --command npx --args -y surfcad-mcp@0.1.0 |
| Other agents | npx skills add artur0x0/surfcad-agent | Registry name, when published: io.github.artur0x0/surfcad |
The skill's frontmatter is only name, description, license, compatibility, metadata, and allowed-tools. metadata.version is the string "0.1.0".