wikimedia-commons-thumbnails SKILL.md skillA
wikimedia-commons-thumbnails from fuzheado/wikipedia-ai-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add fuzheado/wikipedia-ai-skills/wikimedia-commons-thumbnails@git:20261003.928fb9aPins git:20261003.928fb9a in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- fuzheado/wikipedia-ai-skills
- Path
.claude/skills/wikimedia-commons-thumbnails/SKILL.md- Versions recorded
- 6
- Latest version
- git:20261003.928fb9a, committed Oct 3, 2026
- First version recorded
- Jun 18, 2026
- Size
- 38,783 bytes
- Repository stars
- 27
- License
- MIT
Generate, construct, and retrieve raster thumbnail previews for any Wikimedia Commons file — thumb URL scheme, iiurlwidth/iiurlheight Action API pattern, thumbmime format conversion matrix (raster downscale, SVG→PNG, PDF→JPEG, video keyframes), responsive/retina URLs, REST API thumbnails, SPARQL thumbnailUrl, and caching behavior.
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
> ⚠️ **User-Agent required:** All curl and code examples in this skill access Wikimedia APIs. Requests without a descriptive `User-Agent` header will be blocked with HTTP 403 or 429. See the **[wikimedia-api-access](../wikimedia-api-access/SKILL.md)** skill for the correct format and rate-limiting patterns. > ## ⚠️ 2026 thumbnail infrastructure change — READ FIRST **Verified 2026-09-03 against production.** Wikimedia moved thumbnail serving off `upload.wikimedia.org` and now **enforces a standard thumbnail-size ladder** (`$wgThumbnailSteps = [20, 40, 60, 120, 250, 330, 500, 960, 1280, 1920, 3840]`). Three consequences that break older guidance in this skill: 1. **Hand-constructed arbitrary-width thumb URLs now return HTTP 400.** `https://upload.wikimedia.org/wikipedia/commons/thumb/.../600px-X.jpg` → **400**, while `.../500px-X.jpg` and `.../330px-X.jpg` → 200. Only standard sizes are served. 2. **The Action API serves thumbs from `thumb.wikimedia.org`** and **quantizes requested widths upward** to the nearest standard size. `thumbwidth` still reports the *requested* width — parse the `/Npx-` segment from `thumburl` for …
Read the whole file at its exact version.
How to install
mdr add fuzheado/wikipedia-ai-skills/wikimedia-commons-thumbnails@sha256:828d9486d9757b5aThe line at the top of this page pins the label git:20261003.928fb9a, 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_anb5avvtc62eg4ig)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 6 versions of this file, between Jun 18, 2026 and Oct 3, 2026, about one every 21 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261003.928fb9a latest | 2026-10-03 | 928fb9a | 38,783 B | A | view · diff |
| git:20260905.14560d4 | 2026-09-05 | 14560d4 | 34,149 B | A | view · diff |
| git:20260903.b4eb64b | 2026-09-03 | b4eb64b | 32,764 B | A | view · diff |
| git:20260627.84c1774 | 2026-06-27 | 84c1774 | 30,375 B | A | view · diff |
| git:20260623.70ec56a | 2026-06-23 | 70ec56a | 28,314 B | A | view · diff |
| git:20260618.1e72c20 | 2026-06-18 | 1e72c20 | 28,302 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 (38783 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
fuzheado/wikipedia-ai-skills · 27 stars · license MIT · pushed 2026-11-03 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_anb5avvtc62eg4ig GET https://markdownregistry.com/api/v1/resolve?ref=fuzheado/wikipedia-ai-skills/wikimedia-commons-thumbnails GET https://markdownregistry.com/api/v1/blob/828d9486d9757b5abb4760acec33816af2835edafb118f825ad15b9c6644531f
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.