This handles the tedious parts of Salesforce Custom Object metadata generation so you don't deploy something that immediately fails validation. It enforces the critical sharingModel constraint (ReadWrite by default, but ControlledByParent if you have a Master-Detail relationship), catches reserved word collisions, and gets the nameField configuration right whether you need Text or AutoNumber. The validation rule naming alone will save you a deployment error because they can't end with __c like fields do. It also makes smart decisions about when to enable search, reports, and activities based on whether your object is user-facing or just a junction table. Honestly most valuable for teams who keep hitting the same metadata API errors.
npx skills add https://github.com/forcedotcom/sf-skills --skill generating-custom-object