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Agent skill

Convert

by partcad in 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…

Apache-2.0Auto-check passedGame Development

Install Convert

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

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

GitHub CLI
$ gh skill install partcad/partcad convert --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/convert .claude/skills/convert && 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
convert
GitHub stars
503
Token cost
~1.5k tokens
SKILL.md length
817 words
Files
1
Skills in repo
12
Repo updated
First seen
Licence
Apache-2.0

At a glance

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…

  • Works in 5 steps: Work out which case you are in → Make sure PartCAD is available → An object in a package — pc convert → …
  • The user asks to convert
  • SKILL.md covers 1. Work out which case you are…, 2. Make sure PartCAD is…, 3. An object in a package — pc… and 4. A file with no package — pc…, plus 1 more section
  • Calls python

What it does

Convert is an agent skill from 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 changes what that object is) or pc adhoc convert for a file that belongs to no package. Use for /pc:convert or when the user asks to convert, translate, re-save, or change the format of a CAD file, part, sketch or assembly. For a 2D picture use /pc:render; to write a file without changing the package use /pc:export.

Its SKILL.md is about 1.5k 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, covering 3D graphics and WebGL. It works with Three.js. 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 convert
  • Change the format of a CAD file

Example prompts

  • “/convert”

Requirements

  • Python 3

Workflow steps

5 steps, taken from the step headings in SKILL.md.

  1. Work out which case you are in
  2. Make sure PartCAD is available
  3. An object in a package — pc convert
  4. A file with no package — pc adhoc convert
  5. Report what happened

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

    Shell commands in SKILL.md call:

    • python

    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

Convert loads about 1.5k tokens when it runs. Until then it costs about 131 tokens; SKILL.md has 817 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~131
When it runs · the whole SKILL.md, loaded when a task matches
~1.5k

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). 817 words, ~1,494 tokens.

Download SKILL.mdSave it as .claude/skills/convert/SKILL.md (or your agent's skills folder).
name
convert
description
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 changes what that object is) or `pc adhoc convert` for a file that belongs to no package. Use for /pc:convert or when the user asks to convert, translate, re-save, or change the format of a CAD file, part, sketch or assembly. For a 2D picture use /pc:render; to write a file without changing the package use /pc:export.

pc:convert

Turn geometry into another geometry format. $ARGUMENTS says what to convert and to what.

Two commands do this, and picking the right one is most of the job:

  • pc convert — an object a package declares. It writes the file and rewrites the object's definition in partcad.yaml to point at it: the part becomes the new format.
  • pc adhoc convert — a file that belongs to no package. File in, file out; no package is created, read, or changed.

If the user wants a file without changing what the object is, that is /pc:export. If they want a picture, that is /pc:render.

1. Work out which case you are in

Do this before running anything. It is the same first step in /pc:render and /pc:export.

  1. Is there a package? PartCAD searches upward for partcad.yaml, so look in the current directory and above. pc --no-ansi list lists what the package holds; if there is no package it says so.
  2. Does the reference name an object? Check it against pc --no-ansi list parts / list sketches / list assemblies. pc --no-ansi info <name> succeeds only for an object that resolves.
  3. Does a file the user named belong to an object? Someone who says "convert bracket.step" inside a package usually means the part built from it. Read partcad.yaml and look for an object whose path: is that file — and note that a file-backed object without a path: is <name> plus the type's extension, so a part bracket of type step is bracket.step whether or not the path is written down.

If 2 or 3 matched, it is an object: use pc convert (§3). Converting its file behind the package's back would leave partcad.yaml describing a format that is no longer there.

If there is no package, or the file is not one an object is built from, it is ad-hoc: use pc adhoc convert (§4).

When it is genuinely ambiguous — a package exists and the file sits inside it but nothing declares it — say which you picked and why, rather than guessing silently.

2. Make sure PartCAD is available

Resolve a command as /pc:init does (pc, then partcad, then python -m partcad_cli.click.command). If none is found, stop and run /pc:setup executable first.

Pass --no-ansi on every run so the output is plain text. It is a global flag and goes before the subcommand, and it routes the logs to stderr — so capture both streams when reading them: pc --no-ansi convert ... 2>&1.

Show full SKILL.md (409 more words)Show less

3. An object in a package — pc convert

sh
pc --no-ansi convert part bracket -t step
pc --no-ansi convert sketch outline -t dxf
pc --no-ansi convert assembly gearbox -t urdf

Target formats, by kind:

kind-t
partstep, brep, stl, 3mf, threejs, obj, gltf, iges
sketchsvg, dxf
assemblyassy, urdf

Options: -P <package> for an object in another package, -O <dir> for where the file goes (the directory must exist; it defaults to the package directory), and --dry-run.

This edits partcad.yaml. Say so before you run it, and prefer --dry-run first — show the user what would change, then run it for real. What is at stake is not the file but the object: a cadquery part converted to step is no longer a script, so its parameters and the code that produced it stop being part of the package. If the user only wants a STEP file to send someone, they want /pc:export, not this.

An assembly conversion is the largest of these. To URDF it writes the .urdf and an STL per distinct shape; to ASSY it writes an stl part per URDF link, an interface pair per joint, and an .assy that connects the parts through them.

4. A file with no package — pc adhoc convert

PartCAD wraps the file in a throwaway package, converts it, and deletes the package again. Types are inferred from the file names; --input and --output say them outright when an extension is missing or misleading:

sh
pc --no-ansi adhoc convert part bracket.step bracket.stl
pc --no-ansi adhoc convert part --input step bracket.dat bracket.stl
pc --no-ansi adhoc convert part --output 3mf bracket.step      # names the output after the input
pc --no-ansi adhoc convert sketch outline.svg outline.dxf
  • part reads step, brep, stl, 3mf, threejs, obj, iges, gltf, cadquery, build123d, chili3d, sdf, scad, and writes all of those except chili3d, sdf and scad — PartCAD reads those three but has no exporter that writes them back.
  • sketch reads and writes svg, dxf, cadquery, build123d.
  • urdf and assy are refused: an ASSY file is a set of references to the parts of a package and a URDF becomes a part per link, so neither means anything without one. A user who has a URDF needs it in a package first (pc import assembly) and then pc convert assembly.

Nothing here writes a picture: pc adhoc convert sketch a.svg b.png is refused on purpose. Rendering a bare file is pc adhoc render, which is /pc:render.

5. Report what happened

Name the files that were written, with their paths, and say plainly whether partcad.yaml changed — it does for pc convert and never for pc adhoc convert. If PartCAD printed an error, surface it verbatim rather than working around it: a conversion that fails on the geometry is a fact about the model, not something to retry with different flags.

© 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/convert of partcad/partcad.

Open the folder on GitHubat commit 37fddfa

Compare with similar skills

Convert 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.

Convert compared with similar skills
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Convert this skillpartcad/partcad503—~1.5kAutomated safety check: PassApache-2.0
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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
Threejs Gameplay Systemsvalkor-ai/loom1.2k1 repos~1.4kAutomated safety check: PassApache-2.0
Threejs World Generationcalesthio/OpenMontage65k—~2kAutomated safety check: PassAGPL-3.0

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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

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  • Gen Sketch

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Works with

Categories

Questions about Convert

What does Convert do?

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…. Convert is an agent skill from partcad/partcad.js, SVG, DXF, URDF, ASSY - with pc convert for an object a package declares (which changes what that object is) or pc adhoc convert for a file that belongs to no package.

When should I use Convert?

Convert fits situations like: the user asks to convert; change the format of a CAD file.

How do I install Convert in Claude Code?

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

How do I install Convert in Codex?

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

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

What does Convert need to run?

Going by SKILL.md and its folder, Convert needs the command-line tools its instructions call (python). Our summary lists: Python 3.

Does Convert 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 Convert 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 Convert use?

Convert 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 Convert use?

About 1.5k tokens (SKILL.md is roughly 6k 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 Convert?

Skills that share tags, products or a category with Convert: 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 Threejs Gameplay Systems (valkor-ai/loom, 1.2k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Convert?

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.