fallback_engines_tried
Engines that failed before the successful one
How to use it
fallback_engines_tried is exposed by the Crawl4ai MCP MCP server. Add the server to your MCP client (Claude Desktop, Cursor, Windsurf and others), and the fallback_engines_tried tool becomes available to the model automatically. See the full listing for setup details and every tool this server provides.
Install Crawl4ai MCP
pip install --upgrade pipOther tools in Crawl4ai MCP (18)
Likely anti-bot / verification / denied result
Markdown or HTML
markdown or html
auto
Final resolved URL after redirects
""
Normalized extracted links
Why the LLM step degraded
Whether LLM enhancement was actually applied
10
(required)
List of {title, url, snippet}
Extracted title
Number of results
Original URL
Present for supported video transcript extraction results