Crawl4AI Claude Skill

A comprehensive Claude skill for web crawling and data extraction using Crawl4AI. This skill enables Claude to scrape websites, extract structured data, handle JavaScript-heavy pages, crawl multiple URLs, and build automated web data pipelines.

Features

Web Crawling: Extract content from any website with full JavaScript support
Data Extraction: Schema-based CSS extraction (LLM-free) and LLM-based extraction
Markdown Generation: Clean, well-formatted markdown output optimized for LLM consumption
Content Filtering: Relevance-based filtering using BM25 and quality-based pruning
Session Management: Persistent sessions for authenticated crawling
Batch Processing: Concurrent multi-URL crawling
CLI & SDK: Both command-line interface and Python SDK support

Installation

Method 1: Import as ZIP (Recommended for Claude Desktop)

Download or clone this repository

Create a ZIP file of the crawl4ai directory:

cd crawl4ai-skill
zip -r crawl4ai.zip crawl4ai/

In Claude Desktop, go to Settings → Developer → Import Skill
Select the crawl4ai.zip file

Method 2: Git Clone

git clone https://github.com/brettdavies/crawl4ai-skill.git
cd crawl4ai-skill

Then add the skill directory to Claude's skills folder or import via Claude Desktop.

Prerequisites

This skill requires the Crawl4AI Python library:

pip install crawl4ai
crawl4ai-setup

# Verify installation
crawl4ai-doctor

Quick Start

CLI Usage (Recommended for Quick Tasks)

# Basic crawling - returns markdown
crwl https://example.com

# Get markdown output
crwl https://example.com -o markdown

# JSON output with cache bypass
crwl https://example.com -o json -v --bypass-cache

Python SDK Usage

import asyncio
from crawl4ai import AsyncWebCrawler

async def main():
    async with AsyncWebCrawler() as crawler:
        result = await crawler.arun("https://example.com")
        print(result.markdown[:500])

asyncio.run(main())

Documentation

SKILL.md - Complete skill documentation with examples
CLI Guide - Command-line interface reference
SDK Guide - Python SDK quick reference
Complete SDK Reference - Full API documentation (5900+ lines)

Common Use Cases

Documentation to Markdown

crwl https://docs.example.com -o markdown > docs.md

E-commerce Product Monitoring

# Generate schema once (uses LLM)
python crawl4ai/scripts/extraction_pipeline.py --generate-schema https://shop.com "extract products"

# Use schema for extraction (no LLM costs)
crwl https://shop.com -e extract_css.yml -s product_schema.json -o json

News Aggregation

# Multiple sources with filtering
for url in news1.com news2.com news3.com; do
  crwl "https://$url" -f filter_bm25.yml -o markdown-fit
done

Scripts

The skill includes helper scripts in crawl4ai/scripts/:

basic_crawler.py - Simple markdown extraction
batch_crawler.py - Multi-URL processing
extraction_pipeline.py - Schema generation and extraction

Testing

Run the test suite to verify the skill works correctly:

cd crawl4ai/tests
python run_all_tests.py

Marketplace

This skill is available on Claude Skills marketplaces:

Skills.pub

License

MIT License - see LICENSE file for details.

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

Support

For issues, questions, or feature requests, please open an issue on the GitHub repository.

Changelog

See CHANGELOG.md for version history and updates.

crawl4ai