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Agent skill

Gen

by partcad in partcad/partcad

Generate PartCAD geometry from a description, automatically deciding whether the request is a single part, a multi-part assembly, or a 2D sketch and following the matching flow.

Apache-2.0Auto-check passedGame Development

Install Gen

skills CLI
$ npx skills add partcad/partcad --skill gen -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install partcad/partcad gen --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/partcad/partcad.git skills-src && mkdir -p .claude/skills && cp -r skills-src/ai-agents/common/skills/gen .claude/skills/gen && rm -rf skills-src

Use ~/.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/

Facts

Skill name
gen
GitHub stars
503
Token cost
~469 tokens
SKILL.md length
205 words
Files
1
Skills in repo
12
Repo updated
First seen
Licence
Apache-2.0

At a glance

Generate PartCAD geometry from a description, automatically deciding whether the request is a single part, a multi-part assembly, or a 2D sketch and following the matching flow.

  • The user asks to generate
  • SKILL.md covers Decide: part, assembly, or… and Then
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • Model something in PartCAD without saying whether it is a part

What it does

Gen is an agent skill from partcad/partcad. Generate PartCAD geometry from a description, automatically deciding whether the request is a single part, a multi-part assembly, or a 2D sketch and following the matching flow. Use for /pc:gen or when the user asks to generate, create, or model something in PartCAD without saying whether it is a part, an assembly, or a sketch.

Its SKILL.md is about 470 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Game Development. The repository describes itself as: Package manager for things. Start designing modular hardware! PartCAD is the standard for documenting manufacturable physical products (a.k.a. Digital Thread or TDP). It comes… The licence is Apache-2.0.

When your agent uses it

  • The user asks to generate
  • Model something in PartCAD without saying whether it is a part

Example prompts

  • “/gen”

What it can do on your machine

Read from SKILL.md and the folder at commit 37fddfa. 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

    No URLs in SKILL.md.

    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

Gen loads about 469 tokens when it runs. Until then it costs about 83 tokens; SKILL.md has 205 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~83
When it runs · the whole SKILL.md, loaded when a task matches
~469

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

The full file from partcad/partcad at commit 37fddfa, republished under its Apache-2.0 licence (© partcad). 205 words, ~469 tokens.

Download SKILL.mdSave it as .claude/skills/gen/SKILL.md (or your agent's skills folder).
name
gen
description
Generate PartCAD geometry from a description, automatically deciding whether the request is a single part, a multi-part assembly, or a 2D sketch and following the matching flow. Use for /pc:gen or when the user asks to generate, create, or model something in PartCAD without saying whether it is a part, an assembly, or a sketch.

pc:gen

Entry point for PartCAD generation when the user has not said whether they want a single part, an assembly, or a 2D sketch. The text after the command ($ARGUMENTS) is the description of what to build. Decide which it is, tell the user your choice, then follow that flow — passing the same description through.

Decide: part, assembly, or sketch?

  • Part → /pc:gen-part. One continuous piece of 3D geometry — a bracket, a gear, a housing, a knob. Modeled as a single script, even when intricate.
  • Assembly → /pc:gen-assembly. Several distinct 3D components that fit or move relative to each other — a gearbox, a robot arm, a body with a lid, anything joined by fasteners.
  • Sketch → /pc:gen-sketch. A 2D profile, outline, or blueprint — a gasket shape, a plate outline, a cross-section to be extruded later.

Heuristics:

  • "2D", "profile", "outline", "sketch", "cross-section", "blueprint" → sketch.
  • One noun, "a"/"single", one manufacturing process, one printed/machined piece → part.
  • Plurals, "with", "attached to", "... and a ...", moving joints, fasteners, or named sub-components → assembly.

If it is genuinely ambiguous, ask one short question. Otherwise proceed with your best judgment and state which you picked — the user can redirect.

Then

  • Sketch → follow /pc:gen-sketch.
  • Part → follow /pc:gen-part.
  • Assembly → follow /pc:gen-assembly (which itself uses /pc:gen-part for any missing components).

© partcad, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in ai-agents/common/skills/gen of partcad/partcad.

Open the folder on GitHubat commit 37fddfa

Compare with similar skills

Gen 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.

Gen compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Gen this skillpartcad/partcad503—~469Automated safety check: PassApache-2.0
Image to Three.js Modelimg2threejs/img2threejs18k1 repos~8.2kAutomated safety check: PassApache-2.0
Web CloneJane-xiaoer/claude-skill-web-clone1k2 repos~2.7kAutomated safety check: PassMIT
Threejs Game Directormajidmanzarpour/threejs-game-skills2.4k—~2.2kAutomated safety check: PassMIT
Game Asset Generatorhtdt/godogen7.1k—~2.8kAutomated safety check: PassMIT
Threejs Gameplay Systemsvalkor-ai/loom1.2k1 repos~1.4kAutomated safety check: PassApache-2.0

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More from partcad/partcad

All 12 skills in this repo

  • Add Interfaces

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    Enrich an existing PartCAD part with connection interfaces and ports (mating metadata) so it can be mated to other parts automatically.

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  • Convert

    partcad/partcad

    Convert a CAD file or a PartCAD object to another geometry format - STEP, BREP, STL, 3MF, OBJ, IGES, glTF, three.js, SVG, DXF, URDF, ASSY - with pc convert for an object a package declares (which…

    503 GitHub stars~1.5k tokensUpdated today
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  • Describe

    partcad/partcad

    Write a narratable, accessibility-oriented text description of an existing PartCAD part, assembly, or sketch from its measured bounding box and volume, from renders taken at several viewing angles…

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  • Export

    partcad/partcad

    Write a CAD file out of an object a PartCAD package declares - STEP, BREP, STL, 3MF, OBJ, IGES, glTF, three.js, URDF for 3D, SVG or DXF for a sketch, or a file type the package implements itself -…

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  • Gen Part

    partcad/partcad

    Generate a PartCAD part from a natural-language description (and optional reference images/requirements) by authoring a CAD script and validating it with the PartCAD CLI.

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  • Gen Sketch

    partcad/partcad

    Generate a PartCAD 2D sketch from a natural-language description by authoring the sketch (build123d / cadquery / dxf / svg / basic) and validating it with the PartCAD CLI.

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Categories

Questions about Gen

What does Gen do?

Generate PartCAD geometry from a description, automatically deciding whether the request is a single part, a multi-part assembly, or a 2D sketch and following the matching flow. Gen is an agent skill from partcad/partcad. Generate PartCAD geometry from a description, automatically deciding whether the request is a single part, a multi-part assembly, or a 2D sketch and following the matching flow.

When should I use Gen?

Gen fits situations like: the user asks to generate; model something in PartCAD without saying whether it is a part.

How do I install Gen in Claude Code?

Run `npx skills add partcad/partcad --skill gen -a claude-code`. Or copy the skill folder (ai-agents/common/skills/gen in partcad/partcad) into .claude/skills/gen in your project. Claude Code loads it when a task matches its description.

How do I install Gen in Codex?

Run `npx skills add partcad/partcad --skill gen -a codex`. Or copy the skill folder (ai-agents/common/skills/gen in partcad/partcad) into .agents/skills/gen in your project. Codex loads it when a task matches its description.

Can I use Gen 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 partcad/partcad --skill gen -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/gen, .gemini/skills/gen, .github/skills/gen and .opencode/skills/gen in your project.

What does Gen need to run?

SKILL.md names no scripts, command-line tools or credentials: Gen is instructions for the agent only.

Does Gen access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Gen 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 Gen use?

Gen is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Gen use?

About 469 tokens (SKILL.md is roughly 1.9k 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 Gen?

Skills that share tags, products or a category with Gen: Image to Three.js Model (img2threejs/img2threejs, 18k stars), Web Clone (Jane-xiaoer/claude-skill-web-clone, 1k stars), Threejs Game Director (majidmanzarpour/threejs-game-skills, 2.4k stars) and Game Asset Generator (htdt/godogen, 7.1k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Gen?

partcad (a GitHub organization) maintains it in partcad/partcad, which has 503 GitHub stars. The repository holds 12 skills in this directory. The repository was last updated on October 8, 2026.

Source: partcad/partcad on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.