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Agent skill

Design

by andymai in andymai/brepjs

A skill your agent uses when you have a brepjs part spec and need to decompose it into an ordered build sequence — choosing which kernel operations to use and in what order, preferring reliable ops…

Apache-2.0Auto-check passedDevelopment

Install Design

skills CLI
$ npx skills add andymai/brepjs --skill design -a claude-code

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

GitHub CLI
$ gh skill install andymai/brepjs design --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/andymai/brepjs.git skills-src && mkdir -p .claude/skills && cp -r skills-src/packages/brepjs-cad/skills/design .claude/skills/design && 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
design
GitHub stars
115
Token cost
~607 tokens
SKILL.md length
265 words
Files
1
Skills in repo
21
Repo updated
First seen
Licence
Apache-2.0

At a glance

A skill your agent uses when you have a brepjs part spec and need to decompose it into an ordered build sequence — choosing which kernel operations to use and in what order, preferring reliable ops…

  • Works in 5 steps: Base body — a primitive… → Additive/subtractive booleans — fuse… → Sketched features — when a profile isn't… → …
  • Preferring reliable ops and flagging advanced ones (sweeps
  • SKILL.md covers Decomposition method, Choose reliable operations and Output
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Design is an agent skill from andymai/brepjs. Use when you have a brepjs part spec and need to decompose it into an ordered build sequence — choosing which kernel operations to use and in what order, preferring reliable ops and flagging advanced ones (sweeps, lofts, mechanisms) before any code is authored. Runs in the main session.

Its SKILL.md is about 610 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 Development. The repository describes itself as: Web CAD library with exact B-Rep geometry. The licence is Apache-2.0.

When your agent uses it

  • Preferring reliable ops and flagging advanced ones (sweeps
  • Mechanisms) before any code is authored

Example prompts

  • “/design”

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

  1. Base body — a primitive (box/cylinder/cone/sphere) sized to the main envelope.
  2. Additive/subtractive booleans — fuse bosses/ribs on, cut holes/pockets/bores out.
  3. Sketched features — when a profile isn't primitive-shaped: 2D sketch → extrude/revolve.
  4. Modifiers — fillet/chamfer/shell/offset last, on the consolidated solid.
  5. Multiplicity — circularPattern/rectangularPattern for repeats; compound([...]) for

What it can do on your machine

Read from SKILL.md and the folder at commit 6e20740. 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

Design loads about 607 tokens when it runs. Until then it costs about 74 tokens; SKILL.md has 265 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~74
When it runs · the whole SKILL.md, loaded when a task matches
~607

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 andymai/brepjs at commit 6e20740, republished under its Apache-2.0 licence (© andymai). 265 words, ~607 tokens.

Download SKILL.mdSave it as .claude/skills/design/SKILL.md (or your agent's skills folder).
name
design
description
Use when you have a brepjs part spec and need to decompose it into an ordered build sequence — choosing which kernel operations to use and in what order, preferring reliable ops and flagging advanced ones (sweeps, lofts, mechanisms) before any code is authored. Runs in the main session.
version
0.1.0

Design the build sequence

Turn a spec (from brepjs:brainstorm) into an ordered list of operations the implementer will author. You decide how to build the part — which ops, what order — not the code itself. Run this in the main session.

Decomposition method

Build outward from a base, in this rough order:

  1. Base body — a primitive (box/cylinder/cone/sphere) sized to the main envelope.
  2. Additive/subtractive booleans — fuse bosses/ribs on, cut holes/pockets/bores out.
  3. Sketched features — when a profile isn't primitive-shaped: 2D sketch → extrude/revolve.
  4. Modifiers — fillet/chamfer/shell/offset last, on the consolidated solid.
  5. Multiplicity — circularPattern/rectangularPattern for repeats; compound([...]) for multi-part assemblies (no boolean cost, each body stays distinct).

Choose reliable operations

Prefer kernel ops that succeed first-try; reach for advanced ops only when a feature genuinely needs them, and flag those steps as "expect iteration". The canonical reliability tiers live with the implementer (so its clean-room worker always has them):

→ ../implement/references/operation-tiers.md (reliable-first-try vs advanced vs assemblies vs mechanisms).

Key consequences for the sequence:

  • Round a corner with fillet over chamfer (chamfer is kernel-fragile).
  • Build a prism you'll later fillet/shell from a primitive, not a sketch-extrude, to avoid the Shape3D → ValidSolid lift.
  • A hemisphere/dome is a full sphere clipped by a half-space, not a primitive.
  • Mechanisms (anything that moves) need a motion-validation step in the plan: sweep the drive parameter and assert no interpenetration — a statically-valid assembly can still jam. See ../implement/references/assemblies-motion.md.

Output

Emit a numbered build sequence, each step naming the operation and its inputs, with advanced/risky steps flagged. In the /brepjs:cad pipeline this is the gate where the orchestrator gets approval; standalone, hand it to brepjs:implement.

© andymai, 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 packages/brepjs-cad/skills/design of andymai/brepjs.

Open the folder on GitHubat commit 6e20740

Compare with similar skills

Design 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.

Design compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Design this skillandymai/brepjs115—~607Automated safety check: PassApache-2.0
Vercel Composition Patternssupabase/supabase111k58 repos~726Automated safety check: PassMIT
Finishing a Development Branchobra/superpowers297k5 repos~1.9kAutomated safety check: PassMIT
Typescript Advanced Typesrolling-scopes/rsschool-app10k25 repos~4.2kAutomated safety check: PassMPL-2.0
PR Babysitteropeninterpreter/openinterpreter69k3 repos~4.2kAutomated safety check: PassApache-2.0
Code Review ChecklistshareAI-lab/learn-claude-code78k5 repos~1.1kAutomated safety check: PassMIT

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More from andymai/brepjs

All 21 skills in this repo

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  • Memory And Disposal

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  • Polish

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  • Wasm Interop

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    This skill should be used when working across the JS/WASM boundary in brepjs — writing or debugging code in src/kernel/occt, src/kernel/occtWasm, or src/kernel/brepkit, or diagnosing symptoms like…

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  • Writing Tests

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  • Adding Operations

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Categories

Questions about Design

What does Design do?

A skill your agent uses when you have a brepjs part spec and need to decompose it into an ordered build sequence — choosing which kernel operations to use and in what order, preferring reliable ops…. Design is an agent skill from andymai/brepjs. Use when you have a brepjs part spec and need to decompose it into an ordered build sequence — choosing which kernel operations to use and in what order, preferring reliable ops and flagging advanced ones (sweeps, lofts, mechanisms) before any code is authored.

When should I use Design?

Design fits situations like: preferring reliable ops and flagging advanced ones (sweeps; mechanisms) before any code is authored.

How do I install Design in Claude Code?

Run `npx skills add andymai/brepjs --skill design -a claude-code`. Or copy the skill folder (packages/brepjs-cad/skills/design in andymai/brepjs) into .claude/skills/design in your project. Claude Code loads it when a task matches its description.

How do I install Design in Codex?

Run `npx skills add andymai/brepjs --skill design -a codex`. Or copy the skill folder (packages/brepjs-cad/skills/design in andymai/brepjs) into .agents/skills/design in your project. Codex loads it when a task matches its description.

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

What does Design need to run?

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

Does Design 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 Design 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 Design use?

Design 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 Design use?

About 607 tokens (SKILL.md is roughly 2.4k 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 Design?

Skills that share tags, products or a category with Design: Vercel Composition Patterns (supabase/supabase, 111k stars), Finishing a Development Branch (obra/superpowers, 297k stars), Typescript Advanced Types (rolling-scopes/rsschool-app, 10k stars) and PR Babysitter (openinterpreter/openinterpreter, 69k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Design?

andymai (a GitHub user) maintains it in andymai/brepjs, which has 115 GitHub stars. The repository holds 21 skills in this directory. The repository was last updated on October 8, 2026.

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