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Agent skill

Brainstorm

by andymai in andymai/brepjs

Use at the START of any request to design, model, create, build, or 3D-print a physical part or assembly in brepjs — a bracket, enclosure, mount, gear, gridfinity bin, fixture, knob, adapter, and…

Apache-2.0Auto-check passedAgent Workflows

Install Brainstorm

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

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

GitHub CLI
$ gh skill install andymai/brepjs brainstorm --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/brainstorm .claude/skills/brainstorm && 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
brainstorm
GitHub stars
115
Token cost
~758 tokens
SKILL.md length
318 words
Files
1
Skills in repo
21
Repo updated
First seen
Licence
Apache-2.0

At a glance

Use at the START of any request to design, model, create, build, or 3D-print a physical part or assembly in brepjs — a bracket, enclosure, mount, gear, gridfinity bin, fixture, knob, adapter, and…

  • Tasks that involve Brainstorming
  • SKILL.md covers What a spec contains, Scoping pattern — how to ask…, Domain defaults (load when the… and Output
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • Tasks that involve Requirements gathering

What it does

Brainstorm is an agent skill from andymai/brepjs. Use at the START of any request to design, model, create, build, or 3D-print a physical part or assembly in brepjs — a bracket, enclosure, mount, gear, gridfinity bin, fixture, knob, adapter, and the like. This is the entry point to the brepjs CAD pipeline: it turns a vague or natural-language request ("a bracket for my router", "a gridfinity bin") into an explicit, buildable spec (dimensions in mm, datums, features, material/finish, tolerances) before any geometry is written, then hands off to brepjs:design →…

Its SKILL.md is about 760 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 Agent Workflows, covering Brainstorming and Requirements gathering. The repository describes itself as: Web CAD library with exact B-Rep geometry. The licence is Apache-2.0.

When your agent uses it

  • Tasks that involve Brainstorming
  • Tasks that involve Requirements gathering

Example prompts

  • “a bracket for my router”
  • “a gridfinity bin”
  • “/brainstorm”

What it can do on your machine

Read from SKILL.md and the folder at commit 2907fb1. 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

Brainstorm loads about 758 tokens when it runs. Until then it costs about 156 tokens; SKILL.md has 318 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~156
When it runs · the whole SKILL.md, loaded when a task matches
~758

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 2907fb1, republished under its Apache-2.0 licence (© andymai). 318 words, ~758 tokens.

Download SKILL.mdSave it as .claude/skills/brainstorm/SKILL.md (or your agent's skills folder).
name
brainstorm
description
Use at the START of any request to design, model, create, build, or 3D-print a physical part or assembly in brepjs — a bracket, enclosure, mount, gear, gridfinity bin, fixture, knob, adapter, and the like. This is the entry point to the brepjs CAD pipeline: it turns a vague or natural-language request ("a bracket for my router", "a gridfinity bin") into an explicit, buildable spec (dimensions in mm, datums, features, material/finish, tolerances) before any geometry is written, then hands off to brepjs:design → implement → verify → polish. Runs in the main session so it can ask the user clarifying questions.
version
0.1.0

Brainstorm a brepjs part

Turn a natural-language request into an explicit spec the rest of the pipeline can build from. This is step 1 — the brief. You produce a written spec, not geometry. Run this in the main session (you can talk to the user here); the implement/verify/polish workers cannot.

What a spec contains

  • Overall envelope — bounding dimensions in mm (W × D × H).
  • Datums — where the part sits: base plane at origin? centered? a mounting face?
  • Features — holes (size + pattern), bosses, pockets, ribs, fillets/chamfers, threads, cavities.
  • Material / process — FDM plastic (default for makers), metal, decorative vs functional.
  • Tolerances — fit class for holes/slots; or "non-critical".
  • Assumptions — everything you inferred so the user can correct it.

Scoping pattern — how to ask well

Scoping is mostly open-ended, so default to prose questions asked inline here, not forms:

You want a bracket. To scope it: what surface does it mount to, what does it hold (load + size), and roughly what envelope should it fit in?

Reserve AskUserQuestion (multiple-choice) for concrete, mutually-exclusive decisions once the shape is otherwise clear — e.g. fastener size (M3/M4/M5), material (FDM vs metal), mounting style (flush/tab/flange), tolerance class, edge finish (sharp/fillet/chamfer). Never force a vague request into a multiple-choice form before the user has described intent — that asks them to pick before they've spoken.

Resolve, don't interrogate: if the request + sensible defaults already determine a field, fill it and state the assumption rather than asking.

Domain defaults (load when the request matches)

Maker conventions inform what to assume and what to ask. These live with the implement skill:

  • FDM clearance holes / walls / fits → ../implement/references/fdm-conventions.md
  • Snap-fits, press-fits, heat-set inserts → ../implement/references/mechanical-joints.md
  • Gridfinity 42 mm grid / magnets / stacking → ../implement/references/gridfinity.md

Output

Emit the spec as a compact markdown table (envelope, datums, features, material, tolerances, assumptions). In the /brepjs:cad pipeline this is the gate where the orchestrator confirms the spec with the user; standalone, hand it to brepjs:design to decompose into a build sequence.

© 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/brainstorm of andymai/brepjs.

Open the folder on GitHubat commit 2907fb1

Compare with similar skills

Brainstorm 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.

Brainstorm compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Brainstorm this skillandymai/brepjs115—~758Automated safety check: PassApache-2.0
Brainstormingobra/superpowers297k1 repos~2.5kAutomated safety check: PassMIT
Brainstorming Before BuildingjnMetaCode/superpowers-zh8.3k—~1.8kAutomated safety check: PassMIT
CE BrainstormEveryInc/compound-engineering-plugin25k—~1.9kAutomated safety check: PassMIT
Grill Menateherkai/AIS-OS1.6k—~1.8kAutomated safety check: PassCustom licence
Architect Before You Buildjsmastery-pro/jsm-agent-skill221—~1.1kAutomated safety check: PassMIT

Similar skills

  • Brainstorming

    obra/superpowers

    Makes the agent clarify intent and agree on a design with you before writing any code, scaling the process from a quick spike to a written spec.

    297k GitHub starsUsed in 1 repo~2.5k tokens
    Agent WorkflowsAuto-check passed

  • Brainstorming Before Building

    jnMetaCode/superpowers-zh

    Turns a rough idea into an approved design before any code is written, sorting the request into spike, bounded or architectural and enforcing an approval gate.

    8.3k GitHub stars~1.8k tokensUpdated 2 days ago
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  • CE Brainstorm

    EveryInc/compound-engineering-plugin

    Turns a vague or ambitious feature idea into a requirements-only plan through dialogue with you, sized to the work, before any code is written.

    25k GitHub stars~1.9k tokensUpdated 2 days ago
    Agent WorkflowsAuto-check passed

  • Grill Me

    nateherkai/AIS-OS

    Interview the user relentlessly about a plan, design, or topic, checkpointing every answer to a brainstorm file so nothing is lost.

    1.6k GitHub stars~1.8k tokensUpdated 1 mo ago
    Agent WorkflowsAuto-check passed

  • Architect Before You Build

    jsmastery-pro/jsm-agent-skill

    Runs a short design conversation before coding: aligns on terms, works through the decisions that matter and ends with a plan you confirm.

    221 GitHub stars~1.1k tokensUpdated 3 mo ago
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  • OMA Brainstorm

    first-fluke/oh-my-agent

    Explores goals, constraints and alternative designs one question at a time and saves an approved design document before any planning or coding starts.

    1.3k GitHub stars~2.8k tokensUpdated today
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More from andymai/brepjs

All 21 skills in this repo

  • Implement

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    A skill your agent uses when authoring or editing a brepjs .brep.ts part — writing the geometry with the functional API (box, cylinder, fuse, cut, fillet, sketch→extrude…), declaring an expected…

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  • Memory And Disposal

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  • Polish

    andymai/brepjs

    A skill your agent uses when a valid brepjs part should look designed rather than glued-from-primitives (products, toys, mechanisms, anything a human eyeballs), and when exporting/handing off the…

    115 GitHub stars~588 tokensUpdated yesterday
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  • Wasm Interop

    andymai/brepjs

    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…

    115 GitHub stars~3k tokensUpdated yesterday
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  • Writing Tests

    andymai/brepjs

    This skill should be used when writing, running, or fixing tests in the brepjs repository — when a task says "add a test", "write a regression test", "tests are failing", "test timed out", "coverage…

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  • Adding Operations

    andymai/brepjs

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Categories

Questions about Brainstorm

What does Brainstorm do?

Use at the START of any request to design, model, create, build, or 3D-print a physical part or assembly in brepjs — a bracket, enclosure, mount, gear, gridfinity bin, fixture, knob, adapter, and…. Brainstorm is an agent skill from andymai/brepjs. Use at the START of any request to design, model, create, build, or 3D-print a physical part or assembly in brepjs — a bracket, enclosure, mount, gear, gridfinity bin, fixture, knob, adapter, and the like.

When should I use Brainstorm?

Brainstorm fits situations like: tasks that involve Brainstorming; tasks that involve Requirements gathering.

How do I install Brainstorm in Claude Code?

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

How do I install Brainstorm in Codex?

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

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

What does Brainstorm need to run?

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

Does Brainstorm 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 Brainstorm 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 Brainstorm use?

Brainstorm 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 Brainstorm use?

About 758 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 Brainstorm?

Skills that share tags, products or a category with Brainstorm: Brainstorming (obra/superpowers, 297k stars), Brainstorming Before Building (jnMetaCode/superpowers-zh, 8.3k stars), CE Brainstorm (EveryInc/compound-engineering-plugin, 25k stars) and Grill Me (nateherkai/AIS-OS, 1.6k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Brainstorm?

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 9, 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.