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name: web-cli description: | Portable web scraper CLI for LLMs with JavaScript rendering, form submission, and session persistence.

USE WHEN user needs to scrape a URL, fill forms, take screenshots, or interact with web pages requiring JavaScript execution. Supports Phoenix LiveView applications natively.

Web CLI Skill

When to Activate This Skill

Direct Web Scraping

• "scrape this URL with JavaScript"
• "fetch this page and render it"
• "get the page after JavaScript loads"
• "convert this page to markdown"

Form Submission

• "fill out this form"
• "submit login credentials to this page"
• "enter values into form fields"
• "automate form submission"

Screenshot Capture

• "take a screenshot of this page"
• "capture this webpage as an image"
• "screenshot after JavaScript loads"

Session/Authentication

• "use my logged-in session"
• "maintain session across requests"
• "use a specific browser profile"

LiveView/SPA Support

• "scrape this Phoenix LiveView app"
• "interact with this dynamic page"
• "wait for JavaScript to load"

Tool: web

Copyweb <url> [options]

Core Options

Form Submission Options

Key Features

JavaScript Rendering

Unlike simple HTTP fetches, web renders JavaScript. Essential for:

• Single Page Applications (SPAs)
• Phoenix LiveView pages
• React/Vue/Angular apps
• Pages with dynamic content loading

Phoenix LiveView Support

Automatically handles:

• .phx-connected state waiting
• Form submissions with loading states
• State management between interactions

Session Persistence

The --profile option maintains cookies and session state across requests:

Copy# Login once
web localhost:4000/login --form login_form \
  --input email --value user@example.com \
  --input password --value secret \
  --profile myapp

# Subsequent requests use same session
web localhost:4000/dashboard --profile myapp

Usage Examples

Basic Page Fetch

Copyweb https://example.com

Screenshot with Truncated Output

Copyweb https://example.com --screenshot page.png --truncate-after 5000

Form Login

Copyweb localhost:4000/login \
  --form login_form \
  --input email --value test@example.com \
  --input password --value secret

Execute JavaScript

Copyweb https://example.com --js "document.querySelector('button').click()"

Navigate After Form Submit

Copyweb localhost:4000/login \
  --form login_form \
  --input email --value admin@test.com \
  --input password --value password123 \
  --after-submit localhost:4000/admin/dashboard

When to Use web vs Other Tools

Integration with Other Skills

• brightdata: If web fails due to bot detection, escalate to brightdata skill
• WebFetch: Use for simple static pages (faster, no JS overhead)

Common Patterns

Authenticated Scraping Session

Copy# 1. Login and establish session
web localhost:4000/login \
  --form login_form \
  --input email --value user@example.com \
  --input password --value secret \
  --profile app_session

# 2. Access protected pages
web localhost:4000/protected/data --profile app_session

Capture State After Interaction

Copy# Click a button and capture result
web https://app.example.com \
  --js "document.querySelector('#load-more').click(); await new Promise(r => setTimeout(r, 2000));" \
  --screenshot after-click.png

LiveView Form Submission

Copy# Phoenix LiveView forms work seamlessly
web localhost:4000/users/new \
  --form user_form \
  --input "user[name]" --value "John Doe" \
  --input "user[email]" --value "john@example.com"

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Last Updated: 2025-01-02