kernelcad-sdformat SKILL.md skillA
kernelcad-sdformat from w1ne/kernelcad-web is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add w1ne/kernelcad-web/kernelcad-sdformat@git:20260719.310e9e3Pins git:20260719.310e9e3 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- w1ne/kernelcad-web
- Path
src/agent/skills/kernelcad-sdformat/SKILL.md- Versions recorded
- 5
- Latest version
- git:20260719.310e9e3, committed Jul 19, 2026
- First version recorded
- May 31, 2026
- Size
- 7,923 bytes
- Repository stars
- 33
- License
- MIT
Export multi-part assemblies to SDFormat — closed kinematic loops, native ball joints, solved per-link poses, per-link inertial/visual/collision with mesh files. Use when the downstream simulator ingests SDFormat directly or the assembly needs closed-loop / native-spherical-joint support.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# kernelCAD — SDFormat export
SDFormat is an XML model description that, unlike URDF, accepts closed kinematic loops natively and exposes a native ball-joint type. kernelCAD's `export({ target: 'model', format: 'sdf-gazebo' })` writes a `.sdf` (spec version 1.10 — parsed by current simulator LTS releases) plus a sibling `meshes/` directory with one STL per link. Ship the whole directory: the SDF references `meshes/<part>.stl` by relative URI, resolved against the `.sdf` file location, so the export loads in `gz sim` with no resource-path environment setup.
## When to use over URDF
Pick SDFormat when:
- The assembly has a closed kinematic loop (4-bar linkages, parallel grippers, scissor mechanisms). URDF refuses these; SDFormat accepts.
- The assembly uses a ball mate. URDF must decompose into a 3-revolute chain; SDFormat emits one native `<joint type="ball">`.
- The downstream simulator accepts SDFormat directly.
Otherwise prefer URDF — wider tool ecosystem.
## What the emitter writes (verified against gz-sim)
…Read the whole file at its exact version.
How to install
mdr add w1ne/kernelcad-web/kernelcad-sdformat@sha256:7ee1c0e0f0605935The line at the top of this page pins the label git:20260719.310e9e3, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_p3wthn3y4666hrfi)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 5 versions of this file, between May 31, 2026 and Jul 19, 2026, about one every 12 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260719.310e9e3 latest | 2026-07-19 | 310e9e3 | 7,923 B | A | view · diff |
| git:20260613.17ce236 | 2026-06-13 | 17ce236 | 7,582 B | A | view · diff |
| git:20260611.8c101f7 | 2026-06-11 | 8c101f7 | 7,547 B | A | view · diff |
| git:20260611.f250fbc | 2026-06-11 | f250fbc | 7,558 B | A | view · diff |
| git:20260531.b491756 | 2026-05-31 | b491756 | 3,932 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (7923 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
w1ne/kernelcad-web · 33 stars · license MIT · pushed 2026-10-21 · branch develop
API
GET https://markdownregistry.com/api/v1/artifacts/art_p3wthn3y4666hrfi GET https://markdownregistry.com/api/v1/resolve?ref=w1ne/kernelcad-web/kernelcad-sdformat GET https://markdownregistry.com/api/v1/blob/7ee1c0e0f06059357dc97fb5622c76de4e0f52c5156d09ced03c337c7b318bce
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.