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Agent skill

Security Visual Testing

by proffesor-for-testing in proffesor-for-testing/agentic-qe

Security-first visual testing combining URL validation, PII detection, and visual regression with parallel viewport support.

MITAuto-check passedTesting & QA

Install Security Visual Testing

skills CLI
$ npx skills add proffesor-for-testing/agentic-qe --skill security-visual-testing -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install proffesor-for-testing/agentic-qe security-visual-testing --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/proffesor-for-testing/agentic-qe.git skills-src && mkdir -p .claude/skills && cp -r skills-src/assets/skills/security-visual-testing .claude/skills/security-visual-testing && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
security-visual-testing
GitHub stars
494
Token cost
~1.9k tokens
SKILL.md length
507 words
Files
4 (incl. scripts)
Skills in repo
111
Repo updated
First seen
Licence
MIT

At a glance

Security-first visual testing combining URL validation, PII detection, and visual regression with parallel viewport support.

  • Works in 3 steps: Security Visual Audit (Full Pipeline) → PII-Safe Screenshot → Responsive Visual Audit
  • Testing web applications that handle sensitive data
  • SKILL.md covers Browser engine, Quick Reference Card, Workflows and Integration with AQE v3, plus 4 more sections
  • Calls node

What it does

Security Visual Testing is an agent skill from proffesor-for-testing/agentic-qe. Security-first visual testing combining URL validation, PII detection, and visual regression with parallel viewport support. Use when testing web applications that handle sensitive data, need visual regression coverage, or require WCAG accessibility compliance.

Its SKILL.md is about 1.9k tokens, which your agent loads only when the skill is triggered. The skill folder holds 6 other files, including scripts (for example `evals/security-visual-testing.yaml`, `schemas/output.json` and `scripts/validate-config.json`).

It sits in Testing & QA, covering Visual regression testing and Accessibility. The repository describes itself as: Agentic QE Fleet is an open-source AI-powered QA/QE platform designed for use with Coding Agents (works best with Claude Code) featuring specialized agents and skills to support… The licence is MIT.

When your agent uses it

  • Testing web applications that handle sensitive data
  • Need visual regression coverage
  • Require WCAG accessibility compliance

Example prompts

  • “/security-visual-testing”

Workflow steps

3 steps, taken from the step headings in SKILL.md.

  1. Security Visual Audit (Full Pipeline)
  2. PII-Safe Screenshot
  3. Responsive Visual Audit

What it can do on your machine

Read from SKILL.md and the folder at commit 829d030. 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

    Ships 1 file in scripts/, which the agent can run.

    Shell commands in SKILL.md call:

    • node

    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

Security Visual Testing loads about 1.9k tokens when it runs. Until then it costs about 71 tokens; SKILL.md has 507 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~71
When it runs · the whole SKILL.md, loaded when a task matches
~1.9k

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

Auto-check passed

The automated check found no risky patterns in SKILL.md.

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); the scripts in this folder are not scanned.

SKILL.md

The full file from proffesor-for-testing/agentic-qe at commit 829d030, republished under its MIT licence (© proffesor-for-testing). 507 words, ~1,947 tokens.

Download SKILL.mdSave it as .claude/skills/security-visual-testing/SKILL.md (or your agent's skills folder). This skill also uses 3 other files; get the full folder from GitHub.
name
security-visual-testing
description
Security-first visual testing combining URL validation, PII detection, and visual regression with parallel viewport support. Use when testing web applications that handle sensitive data, need visual regression coverage, or require WCAG accessibility compliance.
category
specialized-testing
priority
high
tokenEstimate
1400
agents
qe-visual-tester, qe-security-scanner, qe-accessibility-auditor
implementation_status
stable
optimization_version
1
last_optimized
2026-01-21
dependencies
visual-testing-advanced, security-testing, accessibility-testing
quick_reference_card
true
tags
security, visual-testing, pii, accessibility, wcag, parallel-viewport, regression

Security Visual Testing

Browser engine

Uses the qe-browser fleet skill (.claude/skills/qe-browser/) for all browser automation. The Vibium engine (10MB Go binary, WebDriver BiDi) is installed automatically by aqe init. For security-visual workflows, qe-browser adds two things on top of stock visual testing: check-injection.js (scans page content for prompt-injection patterns before screenshots are stored) and assert.js (16 typed checks including no_failed_requests for detecting data-leak requests).

bash
# Before storing any screenshot, scan the page
vibium go "$TARGET_URL"
vibium wait load
node .claude/skills/qe-browser/scripts/check-injection.js --include-hidden
INJ=$?
if [ $INJ -ne 0 ]; then
  echo "Prompt-injection findings — do NOT store screenshot"
  exit $INJ
fi
# Safe to proceed with visual-diff
node .claude/skills/qe-browser/scripts/visual-diff.js --name "${PAGE_NAME}"

<default_to_action> When performing security-aware visual testing:

  1. VALIDATE URLs before navigation (check for malicious patterns)
  2. SCAN for PII before saving screenshots (mask sensitive data)
  3. CAPTURE parallel viewports (mobile, tablet, desktop)
  4. COMPARE against baselines (detect visual regressions)
  5. AUDIT accessibility (WCAG 2.1 AA compliance)

Quick Security-Visual Checklist:

  • URL validation (no javascript:, data:, file: schemes)
  • PII detection (emails, phones, SSN, credit cards, API keys)
  • Visual regression (diff threshold < 0.1%)
  • Viewport coverage (320px, 768px, 1024px, 1440px)
  • Accessibility score (> 90% axe-core pass rate)

Critical Success Factors:

  • Always mask PII before storing screenshots
  • Test across all target viewports in parallel
  • Store baselines in version control
  • Run accessibility audits on every visual change </default_to_action>

Quick Reference Card

When to Use
ScenarioUse This Skill?Why
Testing login pagesYesContains PII (passwords, emails)
Visual regression suiteYesParallel viewport + baseline comparison
Payment formsYesCredit card data needs masking
Public marketing pagesMaybeOnly if sensitive data possible
API-only testingNoUse security-testing skill instead
Key Capabilities
CapabilityDescriptionPerformance
URL ValidationBlock malicious URLs before navigation<5ms
PII DetectionFind 6+ types of sensitive data<100ms
Parallel ViewportsTest 4 viewports simultaneously4x faster
Visual RegressionPixel-diff with configurable threshold<500ms
Accessibility AuditWCAG 2.1 A/AA/AAA compliance<2s

Workflows

1. Security Visual Audit (Full Pipeline)
bash
# Run complete security + visual audit
aqe test visual-audit --url https://example.com --security --accessibility

Steps:

  1. Validate URL security (block malicious schemes)
  2. Scan page for security issues (XSS, injection patterns)
  3. Capture screenshots across 4 viewports in parallel
  4. Compare against stored baselines
  5. Run accessibility audit (axe-core)
  6. Generate consolidated report
Show full SKILL.md (191 more words)Show less
2. PII-Safe Screenshot
bash
# Capture screenshot with automatic PII masking
aqe screenshot --url https://example.com/profile --pii-safe

PII Detection Patterns:

  • Email addresses: user@example.com
  • Phone numbers: +1-555-123-4567
  • Credit cards: 4111-1111-1111-1111
  • SSN: 123-45-6789
  • API keys: sk_live_..., AKIA...
  • Passwords: Form fields with type="password"

Masking Strategy:

  • Default: Blur with high intensity
  • Options: redact (black box), pixelate, blur
3. Responsive Visual Audit
bash
# Test visual consistency across viewports
aqe test responsive --url https://example.com --viewports mobile,tablet,desktop

Default Viewports:

NameWidthHeightDevice
mobile320px568pxiPhone SE
tablet768px1024pxiPad
desktop1440px900pxMacBook
wide1920px1080pxFull HD

Integration with AQE v3

Using with BrowserSecurityScanner
typescript
import { BrowserSecurityScanner } from '@agentic-qe/v3';

const scanner = new BrowserSecurityScanner(memory, {
  urlValidation: { enabled: true },
  piiDetection: { enabled: true, maskBeforeSave: true },
  parallelViewports: { maxConcurrent: 4 }
});

const result = await scanner.scanUrl('https://example.com', {
  viewports: ['mobile', 'tablet', 'desktop'],
  accessibility: true
});
Using with TrajectoryAdapter
typescript
import { TrajectoryAdapter } from '@agentic-qe/v3';

const adapter = new TrajectoryAdapter(memory);

// Record testing trajectory for learning
await adapter.startTrajectory('security-visual-test', {
  url: 'https://example.com',
  testType: 'security-visual'
});

// ... perform tests ...

await adapter.endTrajectory(trajectoryId, {
  success: true,
  piiFound: 3,
  visualRegressions: 0,
  accessibilityScore: 95
});

Agent Coordination

Memory Namespace
aqe/security-visual/
├── baselines/*          - Visual regression baselines
├── screenshots/*        - Captured screenshots (PII masked)
├── reports/*            - Audit reports
└── trajectories/*       - Learning trajectories
Fleet Coordination
typescript
const fleet = await FleetManager.coordinate({
  strategy: 'security-visual-audit',
  agents: [
    'qe-visual-tester',      // Visual regression
    'qe-security-scanner',   // URL/PII scanning
    'qe-accessibility-auditor' // WCAG compliance
  ],
  topology: 'parallel',
  maxConcurrent: 4
});

Error Handling

ErrorCauseResolution
URL_BLOCKEDMalicious URL pattern detectedCheck URL, remove javascript:/data:
PII_DETECTEDSensitive data found in screenshotEnable masking or redact manually
BASELINE_MISSINGNo baseline for comparisonRun with --update-baseline first
VIEWPORT_TIMEOUTBrowser didn't respondIncrease timeout or reduce parallel
ACCESSIBILITY_FAILEDWCAG violations foundReview violations, fix issues

Performance Targets

MetricTargetMeasured
URL validation<5ms2ms
PII detection<100ms45ms
Single viewport capture<2s1.2s
4-viewport parallel<3s2.1s
Visual diff<500ms320ms
Accessibility audit<2s1.5s
Full pipeline<10s7.2s

© proffesor-for-testing, 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 3 other files (scripts) in assets/skills/security-visual-testing of proffesor-for-testing/agentic-qe.

  • SKILL.md
  • evals/security-visual-testing.yaml
  • schemas/output.json
  • scripts/validate-config.json

Open the folder on GitHubat commit 829d030

Compare with similar skills

Security Visual Testing next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Security Visual Testing compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Security Visual Testing this skillproffesor-for-testing/agentic-qe494—~1.9kAutomated safety check: PassMIT
Control UIAnastasiyaW/codex-claude-code-config154—~757Automated safety check: PassMIT
Vrtmarigold-ui/marigold146—~787Automated safety check: PassMIT
Control UIcursor/plugins10k2 repos~1.2kAutomated safety check: PassNone
UI Visual DebuggingNangoHQ/nango13k—~1.3kAutomated safety check: PassCustom licence
Browser QAaffaan-m/ECC274k2 repos~1kAutomated safety check: PassMIT

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Categories

Questions about Security Visual Testing

What does Security Visual Testing do?

Security-first visual testing combining URL validation, PII detection, and visual regression with parallel viewport support. Security Visual Testing is an agent skill from proffesor-for-testing/agentic-qe. Security-first visual testing combining URL validation, PII detection, and visual regression with parallel viewport support.

When should I use Security Visual Testing?

Security Visual Testing fits situations like: testing web applications that handle sensitive data; need visual regression coverage; require WCAG accessibility compliance.

How do I install Security Visual Testing in Claude Code?

Run `npx skills add proffesor-for-testing/agentic-qe --skill security-visual-testing -a claude-code`. Or copy the skill folder (assets/skills/security-visual-testing in proffesor-for-testing/agentic-qe) into .claude/skills/security-visual-testing in your project. Claude Code loads it when a task matches its description.

How do I install Security Visual Testing in Codex?

Run `npx skills add proffesor-for-testing/agentic-qe --skill security-visual-testing -a codex`. Or copy the skill folder (assets/skills/security-visual-testing in proffesor-for-testing/agentic-qe) into .agents/skills/security-visual-testing in your project. Codex loads it when a task matches its description.

Can I use Security Visual Testing in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add proffesor-for-testing/agentic-qe --skill security-visual-testing -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/security-visual-testing, .gemini/skills/security-visual-testing, .github/skills/security-visual-testing and .opencode/skills/security-visual-testing in your project.

What does Security Visual Testing need to run?

Going by SKILL.md and its folder, Security Visual Testing needs the command-line tools its instructions call (node).

Does Security Visual Testing access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Security Visual Testing safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.

What licence does Security Visual Testing use?

Security Visual Testing is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Security Visual Testing use?

About 1.9k tokens (SKILL.md is roughly 7.8k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Security Visual Testing?

Skills that share tags, products or a category with Security Visual Testing: Control UI (AnastasiyaW/codex-claude-code-config, 154 stars), Vrt (marigold-ui/marigold, 146 stars), Control UI (cursor/plugins, 10k stars) and UI Visual Debugging (NangoHQ/nango, 13k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Security Visual Testing?

proffesor-for-testing (a GitHub user) maintains it in proffesor-for-testing/agentic-qe, which has 494 GitHub stars. The repository holds 111 skills in this directory. The repository was last updated on October 4, 2026.

Source: proffesor-for-testing/agentic-qe on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.