text-to-cad is a collection of agent workflows for creating, examining, finding, preparing, and transferring CAD, engineering, manufacturing, and robot-description files. It is for agents working with mechanical design, fabrication, simulation, and robotics projects. Catalogue skills, instructions, and a plugin implement these workflows.
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.
npx skills add earthtojake/text-to-cad --skill urdfgit clone --depth 1 https://github.com/earthtojake/text-to-cadWrote 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.
[](https://agentmods.dev/skills/earthtojake/text-to-cad/urdf)<a href="https://agentmods.dev/skills/earthtojake/text-to-cad/urdf"><img src="https://agentmods.dev/badge/skills/earthtojake/text-to-cad/urdf/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.
<a href="https://agentmods.dev/skills/earthtojake/text-to-cad/urdf"><img src="https://agentmods.dev/badge/skills/earthtojake/text-to-cad/urdf.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
- NVIDIA SkillSpector pass
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 | $0.00104 | $0.02332 |
| Opus 5.5 | $0.00042 | $0.00933 |
| Sonnet 5.5 | $0.00021 | $0.00466 |
| Haiku 4.5 | $0.00010 | $0.00233 |
Grade A, and why
urdf 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 6d 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.
How it starts
The opening of the file, as written. The whole thing — 142 lines — stays where its author put it; the contents beside it link to each section on GitHub.
URDF
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 for URDF robot-description outputs. Treat URDF work as constrained kinematic modeling, not just XML writing. The main correctness risks are frame placement, joint-axis semantics, unit consistency, mesh scale, and inertial data.
Setup
Run cadgen through uv, so this skill's commands share one installation, and its warm build daemon, with the CAD app's server:
cadgenbelow meansuvx --no-config --managed-python --python 3.13 --from cadgen==0.7.26 cadgenpythonbelow meansuvx --no-config --managed-python --python 3.13 --from cadgen==0.7.26 python
The first run downloads that installation and the first snapshot its headless browser; later runs reuse both.
Core Rules
- The
.urdffile is the source of truth. Author and edit URDF XML directly; do not build a Python generation pipeline for it. There is nogen_urdf()contract. - Before writing or changing URDF XML, establish the robot's frame, joint, geometry, unit, and assumption ledger and embed it as a comment block at the top of the
.urdffile. Seereferences/design-ledger.md. - Use URDF frame semantics exactly. Joint origins, link frames, joint axes, and visual/collision/inertial origins use different reference frames. See
references/frame-semantics.md. - Do not infer spatial transforms, mesh units, handedness, axes, or joint signs from vague prose. Use CAD transforms, dimensioned drawings, measured values, existing source data, or explicit documented assumptions.
- Never freehand numeric values that are the result of computation — inertia tensors, centers of mass, unit conversions across many links, mirrored transforms. Compute them: closed-form formulas for primitives, or a throwaway helper script for mesh-derived values. See
references/inertials.md. - For physical links, model
inertial,visual, andcollisionseparately when the target consumer needs them. Frame-only links may intentionally omit mass and geometry. - Validate every created or modified
.urdfwithcadgen urdf validatebefore reporting completion. Seereferences/validation.md. - Helper scripts are allowed and encouraged for computation, but they are scaffolding, not the artifact's source of truth. For complex or genuinely parametric models it is reasonable to keep a model-local helper script on disk next to related source code (for example STEP generator sources) and note it in the ledger; this is optional, and the checked-in
.urdfremains canonical.
What ships with it
9 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.
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.
- 6d ago Changed a5d518205604
- 8d ago Changed · +8 lines 2ccd945b2ab7
- 15d ago Changed 0ca8b2360751
- 16d ago Changed 00f44d36cf50
- 17d ago Changed 0d821ac773c6
- 18d ago Changed 553dd61c7be8
- 20d ago Changed f200054a84eb
- 21d ago Changed · -5 lines 49d8f931fbce
- 23d ago Changed · +1 lines 882935b5d0dd
- 25d ago First seen · 138 lines · 104 tokens per session scan A 23d177228550
urdf is a skill published in the GitHub repository earthtojake/text-to-cad (23,333 stars, last pushed today), licensed MIT. It adds 104 tokens to every session and 2,332 once invoked, about $0.0004 per session on Opus 5.5. 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 2026-08-30.
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