UX Heuristic

What it does

When your agent uses it

• The user needs to audit a website
• Interface for usability issues
• Prioritize UX improvements
• Conduct a quick expert review without user testing — even if they say review this UI

Example prompts

• “review this UI”
• “find usability problems”
• “why do users struggle with our app”
• “/ux-heuristic”

Workflow steps

6 steps, taken from the first numbered list in SKILL.md.

1. 1Define scope: Which screens/flows to evaluate
2. 2Walk through the interface 2-3 times with different user tasks
3. 3Flag violations: Note each violation with heuristic #, location, description
4. 4Rate severity: 0-4 scale for each violation
5. 5Prioritize: Fix severity 4 and 3 first
6. 6Report: Organize findings by severity, not by heuristic number

What it can do on your machine

Read from SKILL.md and the folder at commit 4e7f4f8. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  No scripts in the folder and no shell commands in SKILL.md (its code samples are markdown).

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  No URLs in SKILL.md.

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names no API keys, tokens, secrets or passwords.

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

UX Heuristic loads about 1.4k tokens when it runs, and up to ~3.9k if it reads all its reference files. Until then it costs about 96 tokens; SKILL.md has 522 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~96

When it runs · the whole SKILL.md, loaded when a task matches

~1.4k

With references · SKILL.md plus every file in references/, read only if the agent opens them

~3.9k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from asgard-ai-platform/skills at commit 4e7f4f8, republished under its MIT licence (© asgard-ai-platform). 522 words, ~1,385 tokens.

name

ux-heuristic

description

Conduct heuristic evaluation of user interfaces using Nielsen's 10 usability principles. Use this skill when the user needs to audit a website, app, or interface for usability issues, prioritize UX improvements, or conduct a quick expert review without user testing — even if they say 'review this UI', 'find usability problems', or 'why do users struggle with our app'.

metadata.category

WP-21 設計/資訊/傳播/公衛

metadata.tags

ux, heuristic-evaluation, usability, nielsen

IRON LAW: Every Violation Gets a Severity Rating

Finding a violation is half the work. Rating its severity is the other half.
A cosmetic inconsistency and a critical workflow blocker are both "violations"
but require completely different response urgency.

0 = Not a usability problem
1 = Cosmetic only — fix if time permits
2 = Minor — low priority
3 = Major — important to fix, high priority
4 = Catastrophe — must fix before release

# Heuristic Evaluation: {Product/Feature}

## Summary
- Total violations found: {N}
- Severity 4 (catastrophe): {N}
- Severity 3 (major): {N}
- Severity 2 (minor): {N}
- Severity 1 (cosmetic): {N}

## Critical Issues (Severity 3-4)
| # | Location | Heuristic | Issue | Severity | Recommendation |
|---|----------|-----------|-------|----------|---------------|
| 1 | {screen/element} | {#N: name} | {description} | 3/4 | {fix} |

## Other Issues (Severity 1-2)
| # | Location | Heuristic | Issue | Severity |
|---|----------|-----------|-------|----------|
| ... | ... | ... | ... | ... |

© asgard-ai-platform, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 2 other files (references) in ux-heuristic of asgard-ai-platform/skills.

• SKILL.md
• examples/sample_scenario.md
• references/wcag-checklist.md

Open the folder on GitHubat commit 4e7f4f8