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 pnakhat/qa-ai-repo --skill visual-regressiongit clone --depth 1 https://github.com/pnakhat/qa-ai-repoWrote 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/pnakhat/qa-ai-repo/visual-regression)<a href="https://agentmods.dev/skills/pnakhat/qa-ai-repo/visual-regression"><img src="https://agentmods.dev/badge/skills/pnakhat/qa-ai-repo/visual-regression/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/pnakhat/qa-ai-repo/visual-regression"><img src="https://agentmods.dev/badge/skills/pnakhat/qa-ai-repo/visual-regression.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 | $0.00105 | $0.02292 |
| Opus 5 | $0.00053 | $0.01146 |
| Sonnet 5 | $0.00021 | $0.00458 |
| Haiku 4.5 | $0.00011 | $0.00229 |
Grade A, and why
visual-regression 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 10d 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 — 162 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Visual Regression Testing
Catch real visual bugs — a broken layout, a clipped button, a lost focus ring — without a flood of false positives that trains everyone to rubber-stamp diffs. A visual test is only trustworthy if the only thing that can change a pixel is a change to the UI. Get determinism right first; everything else is tuning.
Determinism first — the #1 cause of flaky visual tests
Every flaky visual test is a determinism bug in disguise. Before you touch a threshold, eliminate every source of nondeterministic pixels.
| Source of nondeterminism | Fix |
|---|---|
| CSS animations & transitions | Pass animations: 'disabled' to toHaveScreenshot; inject a global stylesheet that zeroes transition/animation duration |
| Time, dates, relative timestamps ("2m ago") | Freeze the clock — page.clock.setFixedTime(...) or mock Date before navigation |
| Random or live data (feeds, prices, ids) | Seed a fixed dataset or mock the API with page.route; never snapshot live production data |
| Web fonts loading late | Bundle/self-host fonts; await document.fonts.ready before the snapshot so text isn't captured mid-swap |
Viewport & deviceScaleFactor drift |
Pin both in the Playwright project — a 1x vs 2x capture diffs on every pixel |
| OS-level font rendering & anti-aliasing | Generate baselines in the same container image as CI — this is non-negotiable (see below) |
| Lazy-loaded images / spinners still spinning | Wait for network idle and the real content locator before capturing |
| Caret blink, hover/focus bleed | Blur the active element; capture a deliberate state, not an accidental one |
Baselines belong to CI, not your laptop
macOS and Linux render fonts and anti-aliasing differently, so a baseline captured on your MacBook will diff against the same UI rendered on the CI Linux runner — on every pixel of every text edge. The fix is to make baselines a build artifact of the CI environment, not of whoever ran the test last.
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.
- 10d ago First seen · 162 lines · 105 tokens per session scan A f0d4c0538230
visual-regression is a skill published in the GitHub repository pnakhat/qa-ai-repo (2 stars, last pushed 2mo ago), licensed MIT. It adds 105 tokens to every session and 2,292 once invoked, about $0.0005 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 2026-08-31.
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