This handles the tedious parts of writing Salesforce validation rules so you don't have to memorize formula syntax quirks. It knows the common gotchas like wrapping XML tags in CDATA sections, not using TEXT() on text fields, and the fact that CASE() always needs an even number of parameters. When you say "update the formula to also check X" it appends logic instead of replacing everything, which is surprisingly helpful. Good for generating the boilerplate metadata files with proper error messages and formulas, troubleshooting deployment errors, and avoiding the trial and error of getting picklist checks and date conversions right. Saves you from constantly checking the formula reference docs.
npx skills add https://github.com/forcedotcom/sf-skills --skill generating-validation-rule