wikipedia-categories SKILL.md skillF
wikipedia-categories 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/wikipedia-categories@git:20260915.e159054Pins git:20260915.e159054 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- F, 16 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- fuzheado/wikipedia-ai-skills
- Path
.claude/skills/wikipedia-categories/SKILL.md- Versions recorded
- 5
- Latest version
- git:20260915.e159054, committed Sep 15, 2026
- First version recorded
- Jun 10, 2026
- Size
- 27,867 bytes
- Repository stars
- 27
- License
- MIT
Understand and work with Wikipedia's category system — category trees, the three tests for valid categories (Verifiable/Neutral/Defining), topic vs set categories, sort keys and DEFAULTSORT, querying via API, overcategorization rules, and category maintenance workflows.
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:** The API examples below hit Wikimedia endpoints. All requests must include a descriptive `User-Agent` header. See the **[wikimedia-api-access](../wikimedia-api-access/SKILL.md)** skill for the correct format.
>
> 📖 **Prerequisites:** For general page structure (infoboxes, templates, navboxes), see **[wikipedia-page-anatomy](../wikipedia-page-anatomy/SKILL.md)**. For bulk Pywikibot category operations, see **[pywikibot](../pywikibot/SKILL.md)**. This skill covers the **policy rules and query patterns** that sit between those two.
---
## SOP: How Categories Work
Categories are a **namespace** (`Category:`) in MediaWiki. Adding `[[Category:Name]]` to a page's wikitext adds it to that category. Every category has a **category page** that is itself a page in the Category namespace.
### The Category Tree
Categories form a **directed acyclic graph** (a tree, not a tag cloud). Each category page lists `[[Category:ParentCategory]]` to link it upward:
```
Category:Science
└─ Category:Physics
├─ Category:Physicists
│ ├─ Albert Einstein (article)
│ ├─ Category:American physicists
│ └─ ...
…Read the whole file at its exact version.
How to install
mdr add fuzheado/wikipedia-ai-skills/wikipedia-categories@sha256:9fadab62c08596e6The line at the top of this page pins the label git:20260915.e159054, 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_lqvzpy47jr3pggtn)
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Versions
The registry has recorded 5 versions of this file, between Jun 10, 2026 and Sep 15, 2026, about one every 24 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260915.e159054 latest | 2026-09-15 | e159054 | 27,867 B | F | view · diff |
| git:20260911.ddba528 | 2026-09-11 | ddba528 | 27,847 B | F | view · diff |
| git:20260622.61d1847 | 2026-06-22 | 61d1847 | 27,150 B | F | view · diff |
| git:20260621.2a11fde | 2026-06-21 | 2a11fde | 26,462 B | F | view · diff |
| git:20260610.740f144 | 2026-06-10 | 740f144 | 26,201 B | F | view |
Audit of the latest version
- FAIL, critical: No text hidden with inline styles (matched: style="display:none)
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (27867 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 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
Starting a new one? Use a template for SKILL.md on mdpantry, which passes every one of these checks and says what to change in it.
Source
fuzheado/wikipedia-ai-skills · 27 stars · license MIT · pushed 2026-11-03 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_lqvzpy47jr3pggtn GET https://markdownregistry.com/api/v1/resolve?ref=fuzheado/wikipedia-ai-skills/wikipedia-categories GET https://markdownregistry.com/api/v1/blob/9fadab62c08596e63019b532fd7921bc6d74a4a375ebf5dab44c77e7bf6cb423
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.