What is openscad-bosl2-mastery?

A guide to using BOSL2, a reusable OpenSCAD library for making 3D shapes. It explains named connection points, relative positioning and extended shapes such as rounded boxes and cylinders.

Use it when implementing OpenSCAD geometry with BOSL2, especially models made from attached or rounded components.

It helps make geometric code clearer by placing parts in relation to one another instead of relying on hard-to-follow coordinates.

openscad-bosl2-mastery — Skill for Claude Code and Codex by joaorura

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add joaorura/openscad-skills --skill openscad-bosl2-mastery

Clone the repo

git clone --depth 1 https://github.com/joaorura/openscad-skills

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/joaorura/openscad-skills/openscad-bosl2-mastery/github.svg)](https://agentmods.dev/skills/joaorura/openscad-skills/openscad-bosl2-mastery)

Your own site

<a href="https://agentmods.dev/skills/joaorura/openscad-skills/openscad-bosl2-mastery"><img src="https://agentmods.dev/badge/skills/joaorura/openscad-skills/openscad-bosl2-mastery/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/joaorura/openscad-skills/openscad-bosl2-mastery"><img src="https://agentmods.dev/badge/skills/joaorura/openscad-skills/openscad-bosl2-mastery.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 22 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 507 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00022	$0.00507
Opus 5	$0.00011	$0.00253
Sonnet 5	$0.00004	$0.00101
Haiku 4.5	$0.00002	$0.00051

Measured 12d ago against content hash 6cc456b64229, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

openscad-bosl2-mastery scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

openscad-bosl2-mastery/SKILL.md · 43 lines

What it actually says

OpenSCAD BOSL2 Mastery

Note: This content was generated with the assistance of AI.

Overview

A guide to mastering the Belfry OpenSCAD Library v2 (BOSL2), focusing on intent-based positioning and advanced primitives.

Key Concepts

Attachments & Anchors

Attachments: Position objects relative to each other using the attach module.
Anchors: Named points on a shape (e.g., TOP, BOTTOM, LEFT, RIGHT, FRONT, BACK).
Syntax: attach(TOP) cuboid([10, 10, 5]); to place a cuboid on the top face of the parent.

Shorthands (Commonly Used)

up(z): Equivalent to translate([0,0,z]).
left(x): Equivalent to translate([-x,0,0]).
right(x): Equivalent to translate([x,0,0]).
fwd(y): Equivalent to translate([0,-y,0]).
back(y): Equivalent to translate([0,y,0]).
xrot(angle), yrot(angle), zrot(angle): Axis-specific rotations.

Extended Primitives

cuboid([w, d, h], rounding=r, edges=[TOP, FRONT]): Cube with built-in rounding.
cyl(h=h, d=d, rounding1=r1, rounding2=r2): Cylinder with rounded ends.

Best Practices

Avoid translate: Use up, down, left, right for clarity.
Prioritize attach: Use it for all relative positioning to ensure the model remains parametric.
Use std.scad: Always include <BOSL2/std.scad> to get all core features.

Advanced Techniques

Masking: Use the mask2d and mask3d modules for complex edge subtractions.
VNFs: Use for high-performance custom polyhedra.

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

references/syntax.md 689 B

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

12d ago First seen · 43 lines · 22 tokens per session scan A 6cc456b64229

Subscribe to this mod's changes

openscad-bosl2-mastery is a skill published in the GitHub repository joaorura/openscad-skills (5 stars, last pushed 4mo ago), licensed MIT. It adds 22 tokens to every session and 507 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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