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 hoangatg/ai-agent-toolkit --skill visual-regression-testinggit clone --depth 1 https://github.com/hoangatg/ai-agent-toolkitWrote 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/hoangatg/ai-agent-toolkit/visual-regression-testing)<a href="https://agentmods.dev/skills/hoangatg/ai-agent-toolkit/visual-regression-testing"><img src="https://agentmods.dev/badge/skills/hoangatg/ai-agent-toolkit/visual-regression-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/hoangatg/ai-agent-toolkit/visual-regression-testing"><img src="https://agentmods.dev/badge/skills/hoangatg/ai-agent-toolkit/visual-regression-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 | $0.00037 | $0.00310 |
| Opus 5 | $0.00018 | $0.00155 |
| Sonnet 5 | $0.00007 | $0.00062 |
| Haiku 4.5 | $0.00004 | $0.00031 |
Grade A, and why
visual-regression-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 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.
What it actually says
Visual Regression Testing
Catch unintended UI changes before users do. Screenshot comparison for every PR.
Tool Comparison
| Tool | Type | CI Integration | Cost |
|---|---|---|---|
| Playwright Screenshots | Open source | Any CI | Free |
| Chromatic | Cloud service | GitHub/GitLab | Freemium |
| Percy | Cloud service | Any CI | Paid |
| BackstopJS | Open source | Any CI | Free |
| Loki | Storybook-based | Any CI | Free |
Playwright Visual Testing
import { test, expect } from '@playwright/test'
test('homepage visual', async ({ page }) => {
await page.goto('/')
await expect(page).toHaveScreenshot('homepage.png', {
maxDiffPixels: 100,
threshold: 0.2,
})
})
Best Practices
| Practice | Why |
|---|---|
| Stable test environment | Prevent flaky snapshots |
| Mask dynamic content | Dates, avatars, ads change |
| Test multiple viewports | Mobile, tablet, desktop |
| Use threshold | Allow anti-aliasing differences |
| Review in CI | Approve/reject visual changes in PRs |
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 · 45 lines · 37 tokens per session scan A 556d3d03f5d1
visual-regression-testing is a skill published in the GitHub repository hoangatg/ai-agent-toolkit (1 stars, last pushed 5mo ago), licensed MIT. It adds 37 tokens to every session and 310 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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