A workflow for opening supported computer-aided design (CAD) and machine-tool files in a local browser viewer and returning review links. CAD files describe 3D models or technical drawings, while formats such as G-code describe instructions for manufacturing machines.

It is for reviewing STEP, STL, GLB, G-code, DXF, URDF, and related CAD or robot-description files.

It provides a way to visually inspect these files without manually setting up a separate viewer for each directory or file type.

cad-viewer — Skill for Codex by redmaplewww

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 redmaplewww/ai-cad-workbench --skill cad-viewer

Clone the repo

git clone --depth 1 https://github.com/redmaplewww/ai-cad-workbench

Made for: 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/redmaplewww/ai-cad-workbench/cad-viewer/github.svg)](https://agentmods.dev/skills/redmaplewww/ai-cad-workbench/cad-viewer)

Your own site

<a href="https://agentmods.dev/skills/redmaplewww/ai-cad-workbench/cad-viewer"><img src="https://agentmods.dev/badge/skills/redmaplewww/ai-cad-workbench/cad-viewer/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/redmaplewww/ai-cad-workbench/cad-viewer"><img src="https://agentmods.dev/badge/skills/redmaplewww/ai-cad-workbench/cad-viewer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 109 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,160 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 1 finding. 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	$0.00109	$0.01160
Opus 5	$0.00055	$0.00580
Sonnet 5	$0.00022	$0.00232
Haiku 4.5	$0.00011	$0.00116

Measured 10d ago against content hash e34ee67b9ad2, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

cad-viewer scanned grade A with 1 finding 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 10d ago.

The scan reads SKILL.md. This mod also ships 30 executable files (scripts/viewer/backend/server.mjs, scripts/viewer/dist/assets/BufferGeometryUtils-xu92ooFc.js, scripts/viewer/dist/assets/glbMeshWorker-MCreI3ZZ.js, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

curl -sS -m 2 http://127.0.0.1:4178/__cad/server

skills/cad-viewer/SKILL.md · 102 lines

How it starts

The opening of the file, as written. The whole thing — 102 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CAD Viewer

Provenance: maintained in earthtojake/text-to-cad. Use the installed local skill files as the runtime source of truth; the repository link is only for provenance and release review.

Use this skill to open existing or newly generated CAD, implicit CAD, robot-description, DXF, or plain FDM G-code files in CAD Viewer and hand back live review links. The expected input is one or more explicit file paths.

Start Viewer

Use one local CAD Viewer per machine and serve every directory through ?dir=. The Viewer advertises dynamic-root, so a single server answers for any absolute directory; you never need a second server just to change directories.

First check whether a reusable Viewer is already running on the default port:

curl -sS -m 2 http://127.0.0.1:4178/__cad/server

Reuse that server when the response is JSON with "app": "cad-viewer" and "dynamicRoot": true. Take its url and port from the response and skip straight to Links. Start your own server instead when the probe fails, or when the response's viewerVersion differs from the version in scripts/viewer/package.json — a different version is another checkout's Viewer, not this skill's runtime.

To start one, run from this skill directory:

npm --prefix scripts/viewer run serve -- --host 127.0.0.1 --dir <absolute-model-root> --shutdown-after 12h --json

Choose --dir as the absolute directory that contains the model artifacts and sidecars, commonly <repo>/models or the consuming project's equivalent model directory. The file= value must be relative to that --dir.

The server binds 4178 when it is free and scans forward when it is not, so do not pick ports by hand or probe for a free one. Read the bound port from the --json startup line described under Claude Preview rather than assuming 4178, then append file=:

http://127.0.0.1:<bound-port>/?dir=/absolute/project/models&file=path/to/model.step

Read the full file on GitHub · 102 lines

Files

What ships with it

60 files 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.

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.

10d ago First seen · 102 lines · 109 tokens per session scan A e34ee67b9ad2

Subscribe to this mod's changes

cad-viewer is a skill published in the GitHub repository redmaplewww/ai-cad-workbench (0 stars, last pushed 29d ago), licensed MIT. It adds 109 tokens to every session and 1,160 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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cad-viewer