How do I uninstall the command line tools for Xcode?
Delete this one folder:

 /Library/Developer/CommandLineTools


This uninstall process is documented officially by Apple.

If you have installed these tools another way or have prompts to upgrade them, consider searching for files named like /System/Library/Receipts/com.apple.pkg.CLTools.bom since that may be a receipt for a past installation of the tools that needs to be removed. I have never seen one of these files, but wanted to link to this other answer in case it helps others. Note, these files do not remove the tools, they may govern the prompt that dev tools are in need of an update.


Removing uninstalled Command Line Tools from AppStore updates