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heuristic SKILL.md skillA

This file is byte-identical to the first copy the registry indexed. Same content hash, so the same checks give both the same grade.

heuristic from educlopez/ui-craft is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add educlopez/ui-craft/heuristic@git:20260725.d9710bc

Pins git:20260725.d9710bc in mdr.lock. Pin the fingerprint instead.

Audit grade: A, 17 of 17 checks passed
Kind: SKILL.md skill
Repository: educlopez/ui-craft
Path: .codex/skills/heuristic/SKILL.md
Versions recorded: 5
Latest version: git:20260725.d9710bc, committed Jul 25, 2026
First version recorded: Apr 18, 2026
Size: 4,179 bytes
Repository stars: 425
License: MIT

Produce a scored heuristic critique of the UI using Nielsen's 10 + 6 design laws + optional persona walkthroughs. Outputs a machine-parseable scorecard plus a 0-100 UsabilityScore (the judged companion to the deterministic UICraftScore). Invoke when the user asks for heuristic on their UI, or mentions 'heuristic' alongside design / UI / frontend work.

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

<!-- HARNESS MIRROR — do not edit here. Canonical source: skills/ or commands/. After editing source, copy into cli/assets/<harness>/ and repo-root harness mirrors. -->

**Context:** this sub-skill is one lens of the broader `ui-craft` skill. If the `ui-craft` skill is also installed, read its SKILL.md first for Discovery + Anti-Slop + Craft Test, then apply the specific lens below.

Score the UI at `$ARGUMENTS` against Nielsen's 10 + 6 design laws. Load the `ui-craft` skill.

**Step 1 — Load the methodology.** Read `references/heuristics.md` for the full rubric, scoring definitions, design law details, and the required output format. Do NOT invent a new format or a new scale.

**Step 2 — Walk Nielsen's 10 heuristics.** Score each 1-5 per the rubric:
- **1** blocks users · **2** severe friction · **3** works but confusing · **4** works, minor polish · **5** best-in-class

For every heuristic, write a concrete finding — quote text, count elements, name the broken flow. Vague findings are rejected.

**Step 3 — Audit the 6 design laws.** PASS / FAIL each with a specific detail:
- Fitts's Law — touch target sizing, CTA placement
- Hick's Law — choice density, nav + select sizing
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add educlopez/ui-craft/heuristic@sha256:3e5dddcb6bcc515d

The line at the top of this page pins the label git:20260725.d9710bc, 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.

Badge

[![mdr](https://markdownregistry.com/badge/art_vuilhdszf4wai4c6.svg)](https://markdownregistry.com/a/art_vuilhdszf4wai4c6)

0 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 5 versions of this file, between Apr 18, 2026 and Jul 25, 2026, about one every 24 days.

version	committed	commit	size	audit
git:20260725.d9710bc latest	2026-07-25	d9710bc	4,179 B	A	view · diff
git:20260704.14809b1	2026-07-04	14809b1	4,088 B	A	view · diff
git:20260625.2c5b03f	2026-06-25	2c5b03f	4,053 B	A	view · diff
git:20260504.181c8a1	2026-05-04	181c8a1	3,181 B	A	view · diff
git:20260418.e64cd2c	2026-04-18	e64cd2c	3,178 B	A	view

Audit of the latest version

A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.

pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (4179 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

GitHub

educlopez/ui-craft · 425 stars · license MIT · pushed 2026-10-30 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_vuilhdszf4wai4c6
GET https://markdownregistry.com/api/v1/resolve?ref=educlopez/ui-craft/heuristic
GET https://markdownregistry.com/api/v1/blob/3e5dddcb6bcc515dbe9a82d91523728cee47ea7d7df779c19dd2ef33124f145e

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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