MCP Server Builder
anthropics/skills
Guides the design and implementation of Model Context Protocol servers in TypeScript or Python, from tool naming and error messages to evaluation.
Design, build, verify and export 3D CAD models with the ClassCAD MCP.
No licenceAuto-check passed
Install Classcad
$ npx skills add awv-informatik/classcad-ai --skill classcad -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install awv-informatik/classcad-ai classcad --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/awv-informatik/classcad-ai.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/classcad/skills/classcad .claude/skills/classcad && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "classcad" agent skill from https://github.com/awv-informatik/classcad-ai/tree/master/plugins/classcad/skills/classcad into .claude/skills/classcad/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "classcad", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/awv-informatik/classcad-ai/tree/master/plugins/classcad/skills/classcadType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add awv-informatik/classcad-ai --skill classcad -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install awv-informatik/classcad-ai classcad --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/awv-informatik/classcad-ai.git skills-src && mkdir -p .agents/skills && cp -r skills-src/plugins/classcad/skills/classcad .agents/skills/classcad && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "classcad" agent skill from https://github.com/awv-informatik/classcad-ai/tree/master/plugins/classcad/skills/classcad into .agents/skills/classcad/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "classcad", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add awv-informatik/classcad-ai --skill classcad -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install awv-informatik/classcad-ai classcad --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/awv-informatik/classcad-ai.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/plugins/classcad/skills/classcad .cursor/skills/classcad && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "classcad" agent skill from https://github.com/awv-informatik/classcad-ai/tree/master/plugins/classcad/skills/classcad into .cursor/skills/classcad/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "classcad", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/awv-informatik/classcad-ai.git --path plugins/classcad/skills/classcad--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add awv-informatik/classcad-ai --skill classcad -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install awv-informatik/classcad-ai classcad --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/awv-informatik/classcad-ai.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/plugins/classcad/skills/classcad .gemini/skills/classcad && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "classcad" agent skill from https://github.com/awv-informatik/classcad-ai/tree/master/plugins/classcad/skills/classcad into .gemini/skills/classcad/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "classcad", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install awv-informatik/classcad-ai classcadInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add awv-informatik/classcad-ai --skill classcad -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/awv-informatik/classcad-ai.git skills-src && mkdir -p .github/skills && cp -r skills-src/plugins/classcad/skills/classcad .github/skills/classcad && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "classcad" agent skill from https://github.com/awv-informatik/classcad-ai/tree/master/plugins/classcad/skills/classcad into .github/skills/classcad/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "classcad", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add awv-informatik/classcad-ai --skill classcad -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install awv-informatik/classcad-ai classcad --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/awv-informatik/classcad-ai.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/plugins/classcad/skills/classcad .opencode/skills/classcad && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "classcad" agent skill from https://github.com/awv-informatik/classcad-ai/tree/master/plugins/classcad/skills/classcad into .opencode/skills/classcad/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "classcad", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
classcad- GitHub stars
- 122
- Token cost
- ~745 tokens
- SKILL.md length
- 427 words
- Files
- 1
- Skills in repo
- 2
- Repo updated
- First seen
- Licence
- None found
At a glance
Design, build, verify and export 3D CAD models with the ClassCAD MCP.
- Works in 6 steps: Read the input. A plain description, a… → Plan the whole build, then fetch every… → Build in a few substantial scripts.… → …
- The user wants a mechanical part
- SKILL.md covers First use: sign in once, How to build a model and Good to know
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Classcad is an agent skill from awv-informatik/classcad-ai. Design, build, verify and export 3D CAD models with the ClassCAD MCP. Use when the user wants a mechanical part or assembly (bracket, flange, gear, sprocket, housing, enclosure, shaft, fixture), wants to reproduce a technical drawing, needs a parametric or configurable part, or asks for a STEP or STL file.
Its SKILL.md is about 750 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It works with Model Context Protocol.
When your agent uses it
- The user wants a mechanical part
- Assembly (bracket
- Wants to reproduce a technical drawing
- Needs a parametric
Example prompts
- “/classcad”
Workflow steps
6 steps, taken from the first numbered list in SKILL.md.
- Read the input. A plain description, a dimensioned drawing, or a photo each need a different approach. A drawing with dimensions is…
- Plan the whole build, then fetch every document you need in ONE docs call: the matching recipe first, always recipes/verification, then…
- Build in a few substantial scripts. State persists between scripts: a follow-up script finds the part with await api.tree(). Never call…
- Verify with numbers. part.calculateMassProperties after the last operation: compare the volume with what the design math predicts. A…
- Show the result. The session has a live 3D view that opens in the user's browser with the first model and follows every change: give the…
- Deliver. save writes STEP (format: "STP"), STL, GLB or OFB (ClassCAD's own format, with the model's features) to a path on disk: give the…
What it can do on your machine
Read from SKILL.md and the folder at commit 0773070. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md.
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
classcad.aiclasscad.ch
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Classcad loads about 745 tokens when it runs. Until then it costs about 79 tokens; SKILL.md has 427 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
Without a licence we can't republish the file, so here is its outline and opening line. It has 427 words (~745 tokens).
“ClassCAD is a headless CAD engine. The ClassCAD MCP runs it on this machine and gives you a live modeling session. You build a model by writing JavaScript programs against its API, you run them with run_script, and you prove…”
- name
- classcad
Files
Just SKILL.md in plugins/classcad/skills/classcad of awv-informatik/classcad-ai.
Open the folder on GitHubat commit 0773070
Compare with similar skills
Classcad next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Classcad this skillawv-informatik/classcad-ai | 122 | — | ~745 | Automated safety check: Pass | None | |
| MCP Server Builderanthropics/skills | 180k | 63 repos | ~2.3k | Automated safety check: Pass | Apache-2.0 | |
| MCP Server BuildershareAI-lab/learn-claude-code | 78k | 5 repos | ~1.2k | Automated safety check: Pass | MIT | |
| MCP Integration for Pluginsanthropics/claude-plugins-official | 38k | 11 repos | ~3.1k | Automated safety check: Pass | Apache-2.0 | |
| Figma use_figma Plugin API Ruleswarpdotdev/warp | 65k | 4 repos | ~4.4k | Automated safety check: Pass | AGPL-3.0 | |
| Stitch to Remotion Walkthrough Videosgoogle-labs-code/stitch-skills | 8.4k | 6 repos | ~3.2k | Automated safety check: Notes | Apache-2.0 |
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MCP Integration for Plugins
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Explains how to bundle Model Context Protocol servers in a Claude Code plugin, covering config files, stdio, SSE, HTTP and WebSocket server types, and authentication.
Figma use_figma Plugin API Rules
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Required groundwork before any use_figma call: the rules and reference files for running JavaScript in a Figma file through the Plugin API without common failures.
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More from awv-informatik/classcad-ai
Classcad
awv-informatik/classcad-ai
Structured API reference for the ClassCAD headless parametric CAD engine (v1 JSON/WebSocket API).
Related
Works with
Questions about Classcad
What does Classcad do?
Design, build, verify and export 3D CAD models with the ClassCAD MCP. Classcad is an agent skill from awv-informatik/classcad-ai. Design, build, verify and export 3D CAD models with the ClassCAD MCP.
When should I use Classcad?
Classcad fits situations like: the user wants a mechanical part; assembly (bracket; wants to reproduce a technical drawing; needs a parametric.
How do I install Classcad in Claude Code?
Run `npx skills add awv-informatik/classcad-ai --skill classcad -a claude-code`. Or copy the skill folder (plugins/classcad/skills/classcad in awv-informatik/classcad-ai) into .claude/skills/classcad in your project. Claude Code loads it when a task matches its description.
How do I install Classcad in Codex?
Run `npx skills add awv-informatik/classcad-ai --skill classcad -a codex`. Or copy the skill folder (plugins/classcad/skills/classcad in awv-informatik/classcad-ai) into .agents/skills/classcad in your project. Codex loads it when a task matches its description.
Can I use Classcad in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add awv-informatik/classcad-ai --skill classcad -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/classcad, .gemini/skills/classcad, .github/skills/classcad and .opencode/skills/classcad in your project.
What does Classcad need to run?
SKILL.md names no scripts, command-line tools or credentials: Classcad is instructions for the agent only.
Does Classcad access the network?
SKILL.md names 2 domains. As links in the text: classcad.ai and classcad.ch. This is read from the text; nothing was executed.
Is Classcad safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Classcad use?
No licence was found for Classcad or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.
How many tokens does Classcad use?
About 745 tokens (SKILL.md is roughly 3k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Classcad?
Skills that share tags, products or a category with Classcad: MCP Server Builder (anthropics/skills, 180k stars), MCP Server Builder (shareAI-lab/learn-claude-code, 78k stars), MCP Integration for Plugins (anthropics/claude-plugins-official, 38k stars) and Figma use_figma Plugin API Rules (warpdotdev/warp, 65k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Classcad?
awv-informatik (a GitHub organization) maintains it in awv-informatik/classcad-ai, which has 122 GitHub stars. The repository holds 2 skills in this directory. The repository was last updated on October 8, 2026.
Source: awv-informatik/classcad-ai on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.