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 cnfeat/top-pm-skills --skill usability-testinggit clone --depth 1 https://github.com/cnfeat/top-pm-skillsWrote 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/cnfeat/top-pm-skills/usability-testing)<a href="https://agentmods.dev/skills/cnfeat/top-pm-skills/usability-testing"><img src="https://agentmods.dev/badge/skills/cnfeat/top-pm-skills/usability-testing/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/cnfeat/top-pm-skills/usability-testing"><img src="https://agentmods.dev/badge/skills/cnfeat/top-pm-skills/usability-testing.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 | $0.00038 | $0.00909 |
| Opus 5 | $0.00019 | $0.00454 |
| Sonnet 5 | $0.00008 | $0.00182 |
| Haiku 4.5 | $0.00004 | $0.00091 |
Grade A, and why
usability-testing 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 9d 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 — 72 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Usability Testing
Help the user conduct effective usability testing using frameworks and insights from 11 product leaders.
How to Help
When the user asks for help with usability testing:
- Clarify the goal - Determine if they're validating a concept, finding friction points, or optimizing conversion
- Choose the right fidelity - Help them select between Wizard of Oz tests, fake doors, prototypes, or production testing
- Design the test - Guide them on recruiting users, creating scenarios, and what to observe
- Plan for iteration - Discuss how findings will flow back into the product development process
Core Principles
Fake it before you build it
Itamar Gilad: "Initially you fake it - fake door test, smoke test, Wizard of Oz tests. We showed the tabbed inbox working to people, but it wasn't really Gmail, it was just a facade." Validate core value propositions before writing production code using faked versions where humans perform the automated task behind the scenes.
Small samples reveal big friction
Melanie Perkins: "It's amazing how you can find 10 random people on the internet and they can give such astute feedback that's so representative for such a large number of people." Run tests with as few as 10 random people to identify core product issues.
Watch users, don't just ask them
Uri Levine: "Simply watch users and see what they're doing. If they're not doing what you expect, then ask them why." Direct observation reveals behaviors and needs that surveys miss. Ask 'why' when users deviate from the expected path.
Test multiple options, not one
Kristen Berman: "We never do a UX study where we're just showing people one thing. We always present multiple options and relatively look for which one drives the intended behavior." Single-design testing is ineffective for predicting behavior.
Overcome creator bias
Guillermo Rauch: "You tend to overrate how well your products work. It's very important to give your product to another person and watch them interact with it." Directly observing users helps overcome the tendency to think your product is more intuitive than it is.
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.
- 9d ago First seen · 72 lines · 38 tokens per session scan A 3f164351d172
usability-testing is a skill published in the GitHub repository cnfeat/top-pm-skills (48 stars, last pushed 3mo ago), licensed MIT. It adds 38 tokens to every session and 909 once invoked, about $0.0002 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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