usability-check SKILL.md skillA
usability-check from haabe/mycelium is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add haabe/mycelium/usability-check@git:20260910.88d2bd2Pins git:20260910.88d2bd2 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- haabe/mycelium
- Path
plugins/mycelium/skills/usability-check/SKILL.md- Versions recorded
- 6
- Latest version
- git:20260910.88d2bd2, committed Sep 10, 2026
- First version recorded
- May 22, 2026
- Size
- 6,636 bytes
- Repository stars
- 51
- License
- MIT
Evaluate user-facing interfaces against Nielsen's 10 Usability Heuristics. Complements /mycelium:service-check (Downe = service-level quality, Nielsen = interface-level quality).
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
# Usability Heuristic Evaluation Evaluate interface-level usability using Jakob Nielsen's 10 heuristics (1994; titles unchanged, definitions refined 2020). This complements Downe's 15 Good Services principles: Downe checks end-to-end SERVICE quality, Nielsen checks screen-level INTERFACE quality. Both are needed for user-facing work. ## When to Use - During L4 Delivery for any user-facing work (REVIEW via G-V10) - After UI implementation, before marking delivery complete - When users report confusion or friction ## The 10 Heuristics ### 1. Visibility of System Status The system should always keep users informed about what is going on through timely and appropriate feedback. - [ ] Loading states visible for any operation > 1 second - [ ] Progress indicators for multi-step processes - [ ] Success/failure feedback for user actions - [ ] Current location/state clearly indicated (breadcrumbs, active nav) ### 2. Match Between System and Real World The system should speak the users' language, using familiar words, phrases, and concepts rather than system-oriented terms. - [ ] No technical jargon in user-facing text - [ ] Familiar icons and metaphors …
Read the whole file at its exact version.
How to install
mdr add haabe/mycelium/usability-check@sha256:41aec63167bd06f2The line at the top of this page pins the label git:20260910.88d2bd2, 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_rtwaictk75nlyqes)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 6 versions of this file, between May 22, 2026 and Sep 10, 2026, about one every 22 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260910.88d2bd2 latest | 2026-09-10 | 88d2bd2 | 6,636 B | A | view · diff |
| git:20260704.7639f18 | 2026-07-04 | 7639f18 | 6,592 B | A | view · diff |
| git:20260530.f9b3ee4 | 2026-05-30 | f9b3ee4 | 6,592 B | A | view · diff |
| git:20260530.a1fb706 | 2026-05-30 | a1fb706 | 6,449 B | A | view · diff |
| git:20260525.9fac942 | 2026-05-25 | 9fac942 | 5,415 B | A | view · diff |
| git:20260522.1825b22 | 2026-05-22 | 1825b22 | 5,105 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 (6636 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
haabe/mycelium · 51 stars · license MIT · pushed 2026-11-06 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_rtwaictk75nlyqes GET https://markdownregistry.com/api/v1/resolve?ref=haabe/mycelium/usability-check GET https://markdownregistry.com/api/v1/blob/41aec63167bd06f2ffa32216c1227bd94c68681c70a6ccc75215877c7455d764
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.