browser-testing-with-screenshots: Design & UI for AI Agents | OpenAgentSkill

Overview

Use when testing web applications with visual verification - automates Chrome browser interactions, element selection, and screenshot capture for confirming UI functionality

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Browser Testing with Screenshots

Overview

Automate Chrome browser testing with visual verification using browser-tools. Connect to Chrome DevTools Protocol for navigation, interaction, and screenshot capture to confirm application functionality.

Prerequisites

REQUIRED: Install agent-tools from https://github.com/badlogic/agent-tools

# Clone and install agent-tools
git clone https://github.com/badlogic/agent-tools.git
cd agent-tools
# Follow installation instructions in the repository
# Ensure all executables (browser-start.js, browser-nav.js, etc.) are in your PATH

Verify installation:

# Check that browser tools are available
which browser-start.js
which browser-nav.js
which browser-screenshot.js

All browser-* commands referenced in this skill come from the agent-tools repository and must be properly installed and accessible in your system PATH.

When to Use

Use this skill when:

Testing web application UI flows
Verifying visual changes or layouts
Automating repetitive browser interactions
Documenting application behavior with screenshots
Testing localhost applications during development
Need to interact with elements that require human-like selection

Don't use for:

API testing (use direct HTTP calls)
Headless testing where visuals don't matter
Simple page content validation (use curl/wget)

Quick Reference

Task	Command	Purpose
Start browser	`browser-start.js`	Launch Chrome with debugging
Navigate	`browser-nav.js http://localhost:5172/dashboard`	Go to specific URL
Take screenshot	`browser-screenshot.js`	Capture current viewport
Pick elements	`browser-pick.js "Select the login button"`	Interactive element selection
Run JavaScript	`browser-eval.js 'document.title'`	Execute code in page context
Extract content	`browser-content.js`	Get readable page content
View cookies	`browser-cookies.js`	List session cookies

Setup and Basic Workflow

1. Start Chrome with Remote Debugging

# Launch Chrome with debugging enabled (preserves user profile)
browser-start.js

# Or start fresh (no cookies, clean state)
browser-start.js --fresh

Expected Result: Chrome opens on port 9222 with DevTools Protocol enabled

2. Navigate to Application

# Go to your application starting point
browser-nav.js http://localhost:5172/dashboard

Verify: Browser navigates to dashboard page

3. Capture Baseline Screenshot

# Take initial screenshot to confirm page loaded
browser-screenshot.js

Output: Returns path to screenshot file (e.g., screenshot_20231203_141532.png)

Testing Workflow with Screenshots

Complete Test Scenario Example

#!/bin/bash
# Test login and dashboard functionality

echo "🚀 Starting browser test..."

# 1. Launch browser
browser-start.js --fresh

# 2. Navigate to login page
browser-nav.js http://localhost:5172/login
sleep 2

# 3. Take screenshot of login page
LOGIN_SHOT=$(browser-screenshot.js)
echo "📸 Login page: $LOGIN_SHOT"

# 4. Fill login form (interactive element picking)
browser-pick.js "Click the username field"
browser-eval.js 'document.activeElement.value = "testuser"'

browser-pick.js "Click the password field"
browser-eval.js 'document.activeElement.value = "password123"'

# 5. Screenshot filled form
FORM_SHOT=$(browser-screenshot.js)
echo "📸 Filled form: $FORM_SHOT"

# 6. Submit form
browser-pick.js "Click the login button"
sleep 3

# 7. Verify dashboard loaded
browser-nav.js http://localhost:5172/dashboard
DASHBOARD_SHOT=$(browser-screenshot.js)
echo "📸 Dashboard: $DASHBOARD_SHOT"

# 8. Verify specific dashboard elements
browser-pick.js "Select the navigation menu"
browser-eval.js 'console.log("Navigation found:", !!document.querySelector(".nav"))'

echo "✅ Test complete. Screenshots saved."

Element Interaction Pattern

# Interactive element selection (best for dynamic content)
browser-pick.js "Select the submit button"
# User clicks element in browser → returns CSS selector

# Use returned selector for automation
SELECTOR=$(browser-pick.js "Select the submit button" | grep "selector:")
browser-eval.js "document.querySelector('$SELECTOR').click()"

# Take screenshot to verify action
browser-screenshot.js

Advanced Usage

JavaScript Evaluation for Complex Interactions

# Check if element exists before interaction
browser-eval.js 'document.querySelector("#login-form") !== null'

# Wait for dynamic content
browser-eval.js '
  new Promise(resolve => {
    const check = () => {
      if (document.querySelector(".loaded")) resolve(true);
      else setTimeout(check, 100);
    };
    check();
  })
'

# Extract form data
browser-eval.js 'JSON.stringify(Object.fromEntries(new FormData(document.querySelector("form"))))'

Screenshot with Timing

# Navigate and wait before screenshot
browser-nav.js http://localhost:5172/slow-page
sleep 5  # Wait for animations/loading
browser-screenshot.js

Content Extraction for Verification

# Get page title
PAGE_TITLE=$(browser-eval.js 'document.title')
echo "Current page: $PAGE_TITLE"

# Extract readable content
browser-content.js > page_content.md

# Check for specific text
browser-eval.js 'document.body.textContent.includes("Welcome to Dashboard")'

Common Mistakes

Mistake	Problem	Solution
No sleep after navigation	Screenshots of loading page	Add `sleep 2-5` after nav
Hardcoded selectors	Breaks when UI changes	Use `browser-pick.js` for selection
Missing Chrome setup	"Connection refused" errors	Run `browser-start.js` first
Wrong localhost port	Navigation fails	Verify application is running on correct port
Screenshot timing	Captures before content loads	Wait for page load or specific elements
Not preserving state	Login lost between commands	Use default profile, not `--fresh`

Error Handling

# Check if Chrome is running
if ! browser-eval.js 'true' 2>/dev/null; then
  echo "❌ Chrome not connected. Running browser-start.js..."
  browser-start.js
fi

# Verify navigation succeeded
if browser-eval.js 'location.href.includes("dashboard")'; then
  echo "✅ Navigation successful"
else
  echo "❌ Navigation failed"
  exit 1
fi

File Output Patterns

Screenshots: screenshot_YYYYMMDD_HHMMSS.png in current directory
Content: Markdown format via stdout from browser-content.js
Selectors: CSS selectors from browser-pick.js interaction
JavaScript results: JSON or string values from browser-eval.js

Integration with Testing Frameworks

# Create test evidence directory
mkdir -p test-results/$(date +%Y%m%d_%H%M%S)
cd test-results/$(date +%Y%m%d_%H%M%S)

# Run tests with organized screenshots
browser-start.js
for page in login dashboard profile; do
  browser-nav.js "http://localhost:5172/$page"
  sleep 2
  screenshot=$(browser-screenshot.js)
  mv "$screenshot" "${page}_page.png"
  echo "✅ $page page tested"
done

Real-World Impact

Benefits:

Visual verification: Screenshots provide immediate feedback on UI state
Interactive debugging: Element picker works with dynamic/complex selectors
State preservation: Maintains login sessions between commands
Evidence collection: Automated screenshot capture for test documentation
Development workflow: Quick verification of localhost changes

Results:

Faster UI testing iteration (visual confirmation vs manual checking)
Reliable element selection (human picks, automation uses)
Test documentation with visual proof
Catches visual regressions immediately

Key principle: Combine automated navigation with human element selection for robust, maintainable browser testing.

View source ↗

File metadata

name: browser-testing-with-screenshots
description: Use when testing web applications with visual verification - automates Chrome browser interactions, element selection, and screenshot capture for confirming UI functionality

View original text

---
name: browser-testing-with-screenshots
description: Use when testing web applications with visual verification - automates Chrome browser interactions, element selection, and screenshot capture for confirming UI functionality
---

# Browser Testing with Screenshots

## Overview

**Automate Chrome browser testing with visual verification using browser-tools.** Connect to Chrome DevTools Protocol for navigation, interaction, and screenshot capture to confirm application functionality.

## Prerequisites

**REQUIRED:** Install agent-tools from https://github.com/badlogic/agent-tools

```bash
# Clone and install agent-tools
git clone https://github.com/badlogic/agent-tools.git
cd agent-tools
# Follow installation instructions in the repository
# Ensure all executables (browser-start.js, browser-nav.js, etc.) are in your PATH
```

**Verify installation:**

```bash
# Check that browser tools are available
which browser-start.js
which browser-nav.js
which browser-screenshot.js
```

All browser-\* commands referenced in this skill come from the agent-tools repository and must be properly installed and accessible in your system PATH.

## When to Use

**Use this skill when:**

- Testing web application UI flows
- Verifying visual changes or layouts
- Automating repetitive browser interactions
- Documenting application behavior with screenshots
- Testing localhost applications during development
- Need to interact with elements that require human-like selection

**Don't use for:**

- API testing (use direct HTTP calls)
- Headless testing where visuals don't matter
- Simple page content validation (use curl/wget)

## Quick Reference

| Task            | Command                                          | Purpose                       |
| --------------- | ------------------------------------------------ | ----------------------------- |
| Start browser   | `browser-start.js`                               | Launch Chrome with debugging  |
| Navigate        | `browser-nav.js http://localhost:5172/dashboard` | Go to specific URL            |
| Take screenshot | `browser-screenshot.js`                          | Capture current viewport      |
| Pick elements   | `browser-pick.js "Select the login button"`      | Interactive element selection |
| Run JavaScript  | `browser-eval.js 'document.title'`               | Execute code in page context  |
| Extract content | `browser-content.js`                             | Get readable page content     |
| View cookies    | `browser-cookies.js`                             | List session cookies          |

## Setup and Basic Workflow

### 1. Start Chrome with Remote Debugging

```bash
# Launch Chrome with debugging enabled (preserves user profile)
browser-start.js

# Or start fresh (no cookies, clean state)
browser-start.js --fresh
```

**Expected Result**: Chrome opens on port 9222 with DevTools Protocol enabled

### 2. Navigate to Application

```bash
# Go to your application starting point
browser-nav.js http://localhost:5172/dashboard
```

**Verify**: Browser navigates to dashboard page

### 3. Capture Baseline Screenshot

```bash
# Take initial screenshot to confirm page loaded
browser-screenshot.js
```

**Output**: Returns path to screenshot file (e.g., `screenshot_20231203_141532.png`)

## Testing Workflow with Screenshots

### Complete Test Scenario Example

```bash
#!/bin/bash
# Test login and dashboard functionality

echo "🚀 Starting browser test..."

# 1. Launch browser
browser-start.js --fresh

# 2. Navigate to login page
browser-nav.js http://localhost:5172/login
sleep 2

# 3. Take screenshot of login page
LOGIN_SHOT=$(browser-screenshot.js)
echo "📸 Login page: $LOGIN_SHOT"

# 4. Fill login form (interactive element picking)
browser-pick.js "Click the username field"
browser-eval.js 'document.activeElement.value = "testuser"'

browser-pick.js "Click the password field"
browser-eval.js 'document.activeElement.value = "password123"'

# 5. Screenshot filled form
FORM_SHOT=$(browser-screenshot.js)
echo "📸 Filled form: $FORM_SHOT"

# 6. Submit form
browser-pick.js "Click the login button"
sleep 3

# 7. Verify dashboard loaded
browser-nav.js http://localhost:5172/dashboard
DASHBOARD_SHOT=$(browser-screenshot.js)
echo "📸 Dashboard: $DASHBOARD_SHOT"

# 8. Verify specific dashboard elements
browser-pick.js "Select the navigation menu"
browser-eval.js 'console.log("Navigation found:", !!document.querySelector(".nav"))'

echo "✅ Test complete. Screenshots saved."
```

### Element Interaction Pattern

```bash
# Interactive element selection (best for dynamic content)
browser-pick.js "Select the submit button"
# User clicks element in browser → returns CSS selector

# Use returned selector for automation
SELECTOR=$(browser-pick.js "Select the submit button" | grep "selector:")
browser-eval.js "document.querySelector('$SELECTOR').click()"

# Take screenshot to verify action
browser-screenshot.js
```

## Advanced Usage

### JavaScript Evaluation for Complex Interactions

```bash
# Check if element exists before interaction
browser-eval.js 'document.querySelector("#login-form") !== null'

# Wait for dynamic content
browser-eval.js '
  new Promise(resolve => {
    const check = () => {
      if (document.querySelector(".loaded")) resolve(true);
      else setTimeout(check, 100);
    };
    check();
  })
'

# Extract form data
browser-eval.js 'JSON.stringify(Object.fromEntries(new FormData(document.querySelector("form"))))'
```

### Screenshot with Timing

```bash
# Navigate and wait before screenshot
browser-nav.js http://localhost:5172/slow-page
sleep 5  # Wait for animations/loading
browser-screenshot.js
```

### Content Extraction for Verification

```bash
# Get page title
PAGE_TITLE=$(browser-eval.js 'document.title')
echo "Current page: $PAGE_TITLE"

# Extract readable content
browser-content.js > page_content.md

# Check for specific text
browser-eval.js 'document.body.textContent.includes("Welcome to Dashboard")'
```

## Common Mistakes

| Mistake                   | Problem                       | Solution                                      |
| ------------------------- | ----------------------------- | --------------------------------------------- |
| No sleep after navigation | Screenshots of loading page   | Add `sleep 2-5` after nav                     |
| Hardcoded selectors       | Breaks when UI changes        | Use `browser-pick.js` for selection           |
| Missing Chrome setup      | "Connection refused" errors   | Run `browser-start.js` first                  |
| Wrong localhost port      | Navigation fails              | Verify application is running on correct port |
| Screenshot timing         | Captures before content loads | Wait for page load or specific elements       |
| Not preserving state      | Login lost between commands   | Use default profile, not `--fresh`            |

## Error Handling

```bash
# Check if Chrome is running
if ! browser-eval.js 'true' 2>/dev/null; then
  echo "❌ Chrome not connected. Running browser-start.js..."
  browser-start.js
fi

# Verify navigation succeeded
if browser-eval.js 'location.href.includes("dashboard")'; then
  echo "✅ Navigation successful"
else
  echo "❌ Navigation failed"
  exit 1
fi
```

## File Output Patterns

- **Screenshots**: `screenshot_YYYYMMDD_HHMMSS.png` in current directory
- **Content**: Markdown format via stdout from `browser-content.js`
- **Selectors**: CSS selectors from `browser-pick.js` interaction
- **JavaScript results**: JSON or string values from `browser-eval.js`

## Integration with Testing Frameworks

```bash
# Create test evidence directory
mkdir -p test-results/$(date +%Y%m%d_%H%M%S)
cd test-results/$(date +%Y%m%d_%H%M%S)

# Run tests with organized screenshots
browser-start.js
for page in login dashboard profile; do
  browser-nav.js "http://localhost:5172/$page"
  sleep 2
  screenshot=$(browser-screenshot.js)
  mv "$screenshot" "${page}_page.png"
  echo "✅ $page page tested"
done
```

## Real-World Impact

**Benefits:**

- **Visual verification**: Screenshots provide immediate feedback on UI state
- **Interactive debugging**: Element picker works with dynamic/complex selectors
- **State preservation**: Maintains login sessions between commands
- **Evidence collection**: Automated screenshot capture for test documentation
- **Development workflow**: Quick verification of localhost changes

**Results:**

- Faster UI testing iteration (visual confirmation vs manual checking)
- Reliable element selection (human picks, automation uses)
- Test documentation with visual proof
- Catches visual regressions immediately

---

**Key principle:** Combine automated navigation with human element selection for robust, maintainable browser testing.

Review the source

Skill source recorded

Skill instructions are recorded. This is not a runtime test, safety guarantee or compatibility certification.

Review before install: Avoid automatic install

License: Apache-2.0

Dependency or permission surface needs review
Permission surface may require sandboxing
The skill relies on external tools from agent-tools, which must be installed manually; no automated setup is provided.
The browser-pick.js command requires manual user interaction, which may not be suitable for fully automated workflows.
Quality score needs review
Permission surface needs review: secrets or environment access, shell or command execution
Dependency/runtime risk: command execution surface, credential or environment access
Permission surface: secrets or environment access, shell or command execution

Open full audit

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Start with one small task

1Read the source. Confirm the input, expected output, dependencies and permissions.
2Ask your agent for a plan. Approve setup and any costs before running a small isolated test.
3

Source & usage notes

Indexed

Repository metadata and review signals are advisory. Popularity, source discovery and successful execution are different facts.

Source repository: AgentWorkforce/relay
License: Apache-2.0
Version: 1.0.0
Last GitHub push: Sep 4, 2026
Registry updated: Sep 5, 2026
Instruction path: .claude/skills/browser-testing-with-screenshots/SKILL.md @ 34b577854ae7

Version reported in registry metadata; check source releases before relying on it.

Quality

76/100

Strong

Trust

60/100

Agent access

This page exposes the same decision, trust, audit, use-case, and install signals through the Registry API, so agents can rank this skill without scraping the UI.

Open install API LLM text format Open manifest Auto-resolve Plan

More details

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      "No real agent outcome evidence yet"
    ]
  },
  "audit": {
    "score": 78,
    "risk_level": "needs_review",
    "risk_label": "Needs review",
    "warnings": [
      "Dependency or permission surface needs review",
      "Permission surface may require sandboxing",
      "The skill relies on external tools from agent-tools, which must be installed manually; no automated setup is provided.",
      "The browser-pick.js command requires manual user interaction, which may not be suitable for fully automated workflows.",
      "Quality score needs review",
      "Permission surface needs review: secrets or environment access, shell or command execution",
      "Dependency/runtime risk: command execution surface, credential or environment access",
      "Permission surface: secrets or environment access, shell or command execution"
    ]
  },
  "safety_gate": {
    "tier": "blocked",
    "label": "Blocked for auto-install",
    "auto_install_policy": "block",
    "auto_install_allowed": false,
    "human_review_required": true,
    "blocked": true,
    "recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first."
  },
  "quality": {
    "score": 76,
    "label": "Strong"
  },
  "supply": {
    "track": "Coding and developer agents",
    "scenario": "Testing and QA",
    "maintenance": "17d since push",
    "risk": "Needs review"
  },
  "alternative_skills": [
    {
      "slug": "emilkowalski-apple-design",
      "name": "Apple Design",
      "url": "https://www.openagentskill.com/skills/emilkowalski-apple-design",
      "stars": 34452,
      "install_command": "npx skills@latest add emilkowalski/skills",
      "trust_score": 93,
      "audit_score": 94
    }
  ],
  "do_not_use_when": [
    "teams that need a vendor-supported SLA",
    "production agents without a repository review",
    "The skill relies on external tools from agent-tools, which must be installed manually; no automated setup is provided.",
    "No OpenAgentSkill engagement data yet",
    "High-risk permission hints: Shell or command execution, Secrets or environment access",
    "Dependency or permission surface needs review",
    "Permission surface may require sandboxing",
    "The browser-pick.js command requires manual user interaction, which may not be suitable for fully automated workflows."
  ],
  "agent_contract": {
    "task_input": "Use browser-testing-with-screenshots in an agent workflow",
    "recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first.",
    "install_policy": "block",
    "minimum_review_before_use": [
      "Trust: 68/100 Manual review",
      "Audit: 78/100 Needs review",
      "Safety: 34/100 Avoid automatic install",
      "Review repository, license, install command, and permission surface before production use."
    ],
    "expected_agent_output": {
      "selected_skill": "agentworkforce-browser-testing-with-screenshots (browser-testing-with-screenshots)",
      "install_command": "npx skills add AgentWorkforce/relay --skill browser-testing-with-screenshots",
      "risk_summary": "Needs review; Blocked for auto-install; Review before production",
      "verification_result": "Report the smallest successful task, files touched, warnings, and any missing setup."
    }
  },
  "outcome_feedback": {
    "endpoint": "https://www.openagentskill.com/api/agent/outcome",
    "method": "POST",
    "requires_resolve_event_id": true,
    "event_id_source": "Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.",
    "expected_outcomes": [
      "success",
      "failed",
      "not_relevant",
      "blocked_by_risk",
      "setup_required"
    ],
    "payload_template": {
      "event_id": "<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>",
      "skill_slug": "agentworkforce-browser-testing-with-screenshots",
      "task": "Use browser-testing-with-screenshots in an agent workflow",
      "agent": "codex",
      "outcome": "success",
      "install_used": true,
      "risk_blocked": false,
      "setup_required": false,
      "task_success": true,
      "output_quality": 4,
      "error_type": null,
      "human_review_required": false,
      "workspace": "sandbox",
      "time_to_useful_ms": 120000,
      "notes": "Report the smallest successful task, setup friction, files touched, and risk notes."
    }
  },
  "endpoints": {
    "web": "https://www.openagentskill.com/skills/agentworkforce-browser-testing-with-screenshots",
    "api": "https://www.openagentskill.com/api/agent/skills/agentworkforce-browser-testing-with-screenshots",
    "audit": "https://www.openagentskill.com/skills/agentworkforce-browser-testing-with-screenshots/audit",
    "eval": "https://www.openagentskill.com/api/agent/evals?slug=agentworkforce-browser-testing-with-screenshots&task=Use%20browser-testing-with-screenshots%20in%20an%20agent%20workflow&max_risk=medium",
    "resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20browser-testing-with-screenshots%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
    "receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20browser-testing-with-screenshots%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
    "install": "https://www.openagentskill.com/api/skills/agentworkforce-browser-testing-with-screenshots/install",
    "manifest": "https://www.openagentskill.com/api/registry/manifest/agentworkforce-browser-testing-with-screenshots"
  }
}

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Creator: AgentWorkforce
Source: AgentWorkforce/relay
Indexed by: OpenAgentSkill community index

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Overview

Browser Testing with Screenshots

Overview

Prerequisites

When to Use

Quick Reference

Setup and Basic Workflow

1. Start Chrome with Remote Debugging

2. Navigate to Application

3. Capture Baseline Screenshot

Testing Workflow with Screenshots

Complete Test Scenario Example

Element Interaction Pattern

Advanced Usage

JavaScript Evaluation for Complex Interactions

Screenshot with Timing

Content Extraction for Verification

Common Mistakes

Error Handling

File Output Patterns

Integration with Testing Frameworks

Real-World Impact

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Start with one small task

Source & usage notes

Agent access

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