Detect what changed between two page snapshots with fastCRW — stateless diff as a REST primitive. Use when you need to track content changes, monitor a page for updates, or build a cron-based alert system: "has this page changed?", "alert me when pricing changes", "diff this week's scrape against last week's". Step 7 of the crw workflow ladder.
Install
Copy the command and run it in a terminal.
$npx skills add https://us/crw --skill crw-watch
After installing, type/crw-watchin Claude Code to confirm it loaded.