Whisker

AI-powered usability testing CLI. Whisker uses Claude's computer use capability to navigate your website like a real user, identifying UX issues, bugs, and accessibility problems.

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│  WHISKER v0.1.0                                                    │
│  AI-Powered Usability Testing                                      │
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│  (,-.`._,'(       |`-/|                                            │
│      `-.-' \ )-`( , o o)                                           │
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How It Works

1. Launch: Opens a visible Chromium browser at your URL
2. Navigate: Claude sees the screen and decides what actions to take (click, type, scroll)
3. Think Aloud: Claude narrates its thought process, noting confusion or issues
4. Capture: Screenshots are taken after each action
5. Analyze: Claude reviews the session to identify UX issues, bugs, and accessibility problems
6. Report: Generates detailed findings with severity levels, reproduction steps, and suggested fixes

Quick Start

1. Install Whisker

npm install -g whisker-ux

2. Get Your API Key

Get an Anthropic API key from: https://console.anthropic.com/settings/keys

3. Set Up Your Key

Option A: Interactive setup (recommended)

whisker setup

Option B: Create a .env file

echo "ANTHROPIC_API_KEY=sk-ant-your-key-here" > .env

Option C: Environment variable

export ANTHROPIC_API_KEY=sk-ant-your-key-here

4. Run a Test

whisker "Find the pricing page" --url https://your-site.com

5. View Results

Open .whisker/report.md to see the findings.

Run Without Installing (npx)

If you prefer not to install globally:

# Set your API key first (choose one method from Step 3 above)
export ANTHROPIC_API_KEY=sk-ant-your-key-here

# Run with npx
npx whisker-ux "Find the pricing page" --url https://your-site.com

Usage

whisker <task> --url <url> [options]

Arguments

• <task> - The task to complete (e.g., "Sign up for an account", "Find the pricing page")

Options

| Option | Description | Default | |--------|-------------|---------| | -u, --url <url> | URL of the site to test (required) | - | | -p, --persona <persona> | Persona description for the tester | - | | -m, --max-steps <number> | Maximum navigation steps | 50 | | -v, --viewport <WxH> | Viewport size | 1280x800 | | -o, --output <dir> | Output directory | .whisker | | -l, --login | Pause for manual login before AI takes over | - | | -a, --auth <name> | Use saved authentication state | - | | -w, --screenshot-window <n> | Screenshots to keep in context (reduces tokens) | 5 |

Examples

Basic test:

whisker "Find the contact page" --url https://example.com

With persona:

whisker "Complete the checkout flow" \
  --url http://localhost:3000 \
  --persona "First-time user, not tech-savvy, age 65"

Custom viewport (mobile):

whisker "Navigate to settings" \
  --url https://myapp.com \
  --viewport 375x667

Limit steps:

whisker "Find pricing information" \
  --url https://startup.com \
  --max-steps 10

Authentication

For testing sites that require login, Whisker offers two approaches:

Option 1: Interactive Login (--login)

Best for: Quick manual testing, 2FA, OAuth, SSO

whisker "View order history" --url https://mystore.com/account --login

The browser opens, you log in manually, then press Enter to let Claude take over.

Option 2: Saved Auth State (--auth)

Best for: Repeatable tests, CI/CD pipelines

# One-time: save your login session
whisker auth save mysite --url https://mysite.com/login
# Log in manually in the browser, then press Enter

# Future runs: reuse saved auth
whisker "View dashboard" --url https://mysite.com/dashboard --auth mysite

Managing Auth States

whisker auth list              # List saved auth states
whisker auth delete mysite     # Delete a saved auth state

Auth states are stored in ~/.config/whisker/auth/ with restricted permissions.

Note: Auth states contain session cookies which may expire. Re-save if you get logged out.

Output

Whisker generates a report with task completion status, a summary, and detailed findings organized by severity (P0-P3). Each finding includes reproduction steps, screenshot references, and suggested fixes.

.whisker/
├── report.md           # Human-readable findings report
├── report.json         # Structured JSON for automation
└── screenshots/
    ├── step-001.png
    ├── step-002.png
    └── ...

Commands

whisker setup

Configure your Anthropic API key interactively.

whisker logout

Remove your stored API key.

whisker run <task> (default)

Run a usability test. This is the default command.

whisker auth save <name>

Save browser authentication state for reuse. Opens a browser for manual login.

whisker auth list

List all saved authentication states.

whisker auth delete <name>

Delete a saved authentication state.

Configuration

API Key

Whisker looks for your Anthropic API key in this order:

1. ANTHROPIC_API_KEY environment variable
2. .env.local file in current directory (for local overrides)
3. .env file in current directory
4. ~/.config/whisker/config.json (set via whisker setup)

Requirements

• Node.js 18+
• Anthropic API key with access to Claude's computer use capability

Programmatic Usage

import { runSession, writeReport, WhiskerConfig } from 'whisker-ux';

const config: WhiskerConfig = {
  task: "Sign up for an account",
  url: "https://example.com",
  maxSteps: 50,
  viewport: { width: 1280, height: 800 },
  outputDir: ".whisker",
  // Optional auth options:
  // interactiveLogin: true,    // Pause for manual login
  // authStateName: "mysite",   // Use saved auth state
  // screenshotWindow: 5,       // Screenshots to keep in context
};

const { report, sessionLog } = await runSession(config);
await writeReport(report, sessionLog, config.outputDir);

console.log(`Task completed: ${report.taskCompleted}`);
console.log(`Found ${report.findings.length} issues`);

Troubleshooting

"No Anthropic API key configured"

Run whisker setup or set the ANTHROPIC_API_KEY environment variable.

Playwright browser issues

Whisker uses Playwright's Chromium. If you encounter browser issues:

npx playwright install chromium

Rate limiting

If you hit API rate limits, reduce --max-steps or wait before retrying.

Browser not visible

The browser window should appear during testing. If it doesn't, ensure you're not running in a headless environment.

License

MIT

Contributing

Issues and pull requests welcome at github.com/ericli/whisker-ux.