Crawl4ai

Crawl4AI Universal Adapter

Source

• Upstream repository: https://github.com/unclecode/crawl4ai
• Local source checkout: %USERPROFILE%\.crawl4ai-source\crawl4ai
• Local runtime/state root: %USERPROFILE%\.crawl4ai
• Virtual environment: %USERPROFILE%\.crawl4ai\venv
• User command shims: %USERPROFILE%\.local\bin
• Primary CLI: crwl
• Setup command: crawl4ai-setup
• Doctor command: crawl4ai-doctor
• Router delegator: skill-router crawl4ai
• Universal stack source registry: %USERPROFILE%\.universal-ai-stack\config\source-integrations.json

Operating Model

Use Crawl4AI as a shared local CLI/Python source integration, not as copied skill bodies or a per-agent install. The universal install uses:

• one upstream source checkout for README-grounded reference,
• one dedicated Python virtual environment under %USERPROFILE%\.crawl4ai\venv,
• command shims in %USERPROFILE%\.local\bin,
• this canonical skill for routing and workflow instructions,
• compact skill-router wrappers in each AI client.

No persistent MCP bridge is required for normal Crawl4AI work. Use direct CLI or Python calls first.

Safety And State Boundaries

Never commit or paste:

• %USERPROFILE%\.crawl4ai cache, database, profiles, screenshots, HTML, extracted content, browser profile cookies, or generated crawl output,
• %USERPROFILE%\.crawl4ai\venv,
• %USERPROFILE%\.crawl4ai-source\crawl4ai as vendored repo content,
• API keys used for LLM extraction providers,
• private pages, authenticated crawl output, cookies, or profile state.

Respect robots.txt, site terms, auth boundaries, and rate limits. Ask before using authenticated profiles, proxies, or anti-bot/undetected workflows.

Use host-native web search for search-engine discovery. Use Crawl4AI after a target URL or crawl scope is known and the task needs deterministic page retrieval, Markdown, structured extraction, or browser/profile control.

Install And Health

Check local state:

skill-router crawl4ai status

Update source and reinstall:

skill-router crawl4ai update

Run upstream setup:

skill-router crawl4ai setup

Run the upstream health check:

skill-router crawl4ai doctor

Direct commands are also available:

crwl --help
crawl4ai-setup
crawl4ai-doctor

CLI Workflows

Basic crawl to Markdown:

crwl https://example.com -o markdown

Write output to a file:

crwl https://example.com -o markdown -O .\crawl-output.md

Return JSON for agent parsing:

crwl https://example.com -o json

Ask a question about crawled content:

crwl https://example.com -q "Extract pricing and plan names" -o json

Deep crawl a bounded site section:

crwl https://docs.crawl4ai.com --deep-crawl bfs --max-pages 10 -o markdown

Use an explicit subcommand when clarity matters:

crwl crawl https://example.com -o markdown

Profiles And Browser Control

Profiles can preserve login/session state under %USERPROFILE%\.crawl4ai. Use them only when the user explicitly asks for authenticated crawling.

Interactive profile manager:

crwl profiles

Crawl with a saved profile:

crwl https://example.com/dashboard -p my-profile -o json

Check or stop the built-in browser:

crwl browser status
crwl browser stop

Launch a visible browser window for profile/browser work only when requested:

crwl browser view --url https://example.com

Python Workflows

Use Python when the task needs custom crawling, repeated calls, extraction strategies, hooks, or integration with another script:

import asyncio
from crawl4ai import AsyncWebCrawler

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

asyncio.run(main())

Run Python scripts with the dedicated venv:

%USERPROFILE%\.crawl4ai\venv\Scripts\python.exe .\script.py

Router Selection Rules

Prefer this skill when the user asks for:

• Crawl4AI installation, update, setup, doctor, or debugging,
• crwl CLI usage,
• web page crawling or scraping into Markdown/JSON,
• LLM-ready web extraction for RAG or agents,
• bounded deep crawling,
• browser profiles or CDP control through Crawl4AI,
• Python AsyncWebCrawler examples or integration.

Reject this skill for:

• generic web search or current-news lookup,
• ordinary browser automation better handled by Browser/Playwright tools,
• generic website analysis that does not need crawling/extraction,
• unrelated "crawl" language that is not web crawling.