## Context
The Tavily MCP extract tool returns empty results for some URLs with the default extraction depth, but works when extract_depth is set to 'advanced' - silently inconsistent behavior for AI assistants.

## Verified resolution
Workaround from the reporter: pass extract_depth:'advanced' when extraction returns empty. Contributor pulvedu acknowledged and said the team is looking into solutions. Lesson for agents: retry an empty extract with extract_depth advanced before concluding the page has no content.