use-case SKILL.md skillA
use-case from marielynneblock/arcanum-artifex is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add marielynneblock/arcanum-artifex/use-case@v1.0.0Pins v1.0.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- marielynneblock/arcanum-artifex
- Path
skills/analysis/use-case/SKILL.md- Versions recorded
- 3
- Latest version
- v1.0.0, committed Jul 10, 2026
- First version recorded
- Apr 6, 2026
- Size
- 6,754 bytes
- Repository stars
- 4
- License
- none declared
Produces a complete use case following the Cockburn/RUP format. A use case describes a goal-directed interaction between an actor and the system — capturing not just the happy path, but the extension flows (error, alternative, and exception paths) that user stories typically omit.
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
## What this skill does Produces a complete use case following the Cockburn/RUP format. A use case describes a goal-directed interaction between an actor and the system — capturing not just the happy path, but the extension flows (error, alternative, and exception paths) that user stories typically omit. ## When to use it - User asks to "write a use case" or needs more rigorous specification than a user story. - The interaction involves complex branching, multiple actors, or system-to-system calls. - The requirement must satisfy a compliance, audit, or contractual standard that demands formal documentation. - User is breaking down a user story that is too complex to estimate because its edge cases are unknown. - Use cases are being collected for a system specification or `requirements-document`. ## Key concepts ### Use case vs. user story | | User story | Use case | | --- | --- | --- | | **Format** | Persona / want / benefit | Goal / actors / flows | | **Scope** | One sprint | One interaction goal | | **Detail** | Acceptance criteria | Full flow + all extensions | | **Audience** | Agile team | Analyst, architect, tester | …
Read the whole file at its exact version.
How to install
mdr add marielynneblock/arcanum-artifex/use-case@sha256:a5c22dc7ec853cb5The line at the top of this page pins the label v1.0.0, 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_4zhdydol5jqccp5f)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Apr 6, 2026 and Jul 10, 2026, about one every 47 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v1.0.0 latest | 2026-07-10 | ffb3400 | 6,754 B | A | view · diff |
| v1.0.0 | 2026-05-15 | b861afb | 6,461 B | B | view · diff |
| v1.0.0 | 2026-04-06 | 4b61489 | 6,748 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 (6754 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
marielynneblock/arcanum-artifex · 4 stars · license none declared · pushed 2026-09-19 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_4zhdydol5jqccp5f GET https://markdownregistry.com/api/v1/resolve?ref=marielynneblock/arcanum-artifex/use-case GET https://markdownregistry.com/api/v1/blob/a5c22dc7ec853cb5c948d06a08364e957a7bfe662d0fcb5fd1ef26d50213cc61
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.
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