Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add daffy0208/ai-dev-standards --skill usability-testergit clone --depth 1 https://github.com/daffy0208/ai-dev-standardsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/daffy0208/ai-dev-standards/usability-tester)<a href="https://agentmods.dev/skills/daffy0208/ai-dev-standards/usability-tester"><img src="https://agentmods.dev/badge/skills/daffy0208/ai-dev-standards/usability-tester/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/daffy0208/ai-dev-standards/usability-tester"><img src="https://agentmods.dev/badge/skills/daffy0208/ai-dev-standards/usability-tester.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00053 | $0.03113 |
| Opus 5 | $0.00026 | $0.01556 |
| Sonnet 5 | $0.00011 | $0.00623 |
| Haiku 4.5 | $0.00005 | $0.00311 |
Grade A, and why
usability-tester scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 518 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Usability Tester
Validate that users can successfully complete core tasks through systematic observation.
Core Principle
Watch users struggle. The best way to find UX issues is to observe real users attempting real tasks. Their struggles reveal truth that surveys and analytics cannot.
Test Planning
1. Define Test Objectives
Good Objectives:
- "Can users complete onboarding in <5 minutes?"
- "Can users find and use the export feature?"
- "Do users understand the pricing page?"
Bad Objectives:
- "Test the UI" (too vague)
- "See if users like it" (subjective, not behavioral)
2. Research Questions
Examples:
- Where do users get stuck during sign-up?
- Can users find the settings page?
- Do users understand what each tier includes?
- What errors do users encounter?
3. Identify Core Tasks
Choose 3-5 tasks that represent key user journeys:
Example Tasks (Project Management Tool): 1. Sign up and create account
2. Create your first project
3. Invite a team member
4. Assign a task to someone
5. Export project data
4. Recruit Participants
Sample Size:
- 5-8 users per persona
- After 5 users, diminishing returns (Nielsen's research)
- Test in waves: 5 users → fix issues → test 5 more
Recruitment Criteria:
- Match target persona
- Haven't used product before (for onboarding tests)
- Or: Active users (for feature tests)
Incentives:
- $50-100 per hour (B2C)
- $100-200 per hour (B2B professionals)
- Gift cards work well
Task Scenarios
Best Practices
✅ Good task scenario:
"Your team is launching a new project next week. Create a project
called 'Q2 Launch' and invite [email protected] to collaborate."
Why it works:
- Realistic context
- Clear goal
- Natural language
- Doesn't give step-by-step instructions
❌ Bad task scenario:
"Click the 'New Project' button, then enter 'Q2 Launch', then
click Settings, then click Invite, then enter email."
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 8d ago First seen · 518 lines · 53 tokens per session scan A 748e80d78284
usability-tester is a skill published in the GitHub repository daffy0208/ai-dev-standards (36 stars, last pushed 8mo ago), licensed MIT. It adds 53 tokens to every session and 3,113 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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